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Li S, Wang XX, Li M, Wang C, Wang F, Zong H, Wang B, Lv Z, Song N, Liu J. Extension of a biotic ligand model for predicting the toxicity of neodymium to wheat: The effects of pH, Ca 2+ and Mg 2. Ecotoxicol Environ Saf 2024; 271:116013. [PMID: 38281433 DOI: 10.1016/j.ecoenv.2024.116013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 11/17/2023] [Accepted: 01/21/2024] [Indexed: 01/30/2024]
Abstract
The damage excessive neodymium (Nd) causes to animals and plants should not be underestimated. However, there is little research on the impact of pH and associated ions on the toxicity of Nd. Here, a biotic ligand model (BLM) was expanded to predict the effects of pH and chief anions on the toxic impact of Nd on wheat root elongation in a simulated soil solution. The results suggested that Nd3+ and NdOH2+ were the major ions causing phytotoxicity to wheat roots at pH values of 4.5-7.0. The Nd toxicity decreased as the activities of H+, Ca2+, and Mg2+ increased but not when the activities of K+ and Na+ increased. The results indicated that H+, Ca2+, and Mg2+ competed with Nd for binding sites. An extended BLM was developed to consider the effects of pH, H+, Ca2+, and Mg2+, and the following stability constants were obtained: logKNdBL = 2.51, logKNdOHBL = 3.90, logKHBL = 4.01, logKCaBL = 2.43, and logKMgBL = 2.70. The results demonstrated that the BLM could predict the Nd toxicity well while considering the competition of H+, Ca2+, Mg2+ and the toxic species Nd3+ and NdOH2+ for binding sites.
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Affiliation(s)
- Shaojing Li
- College of Science and Information, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Xue Xia Wang
- Institute of plant nutrition and resources, Beijing Agricultural Forestry Academy Sciences, Beijing 100097, PR China
| | - Mengjia Li
- School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Chengming Wang
- Office of Laboratory Management, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Fangli Wang
- School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Haiying Zong
- School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Bin Wang
- Institute of Soil Fertilizer and Agricultural Water Saving, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, PR China
| | - Zefei Lv
- College of Landscape Architecture and forestry, Qingdao Agricultural University, Qingdao 266109, PR China
| | - Ningning Song
- School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China.
| | - Jun Liu
- School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, PR China.
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2
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Duarte RM, Crémazy A, Wood CM, Almeida-Val VMF, Val AL. The biotic ligand model as a promising tool to predict Cu toxicity in amazon blackwaters. Environ Pollut 2024; 341:122988. [PMID: 37992954 DOI: 10.1016/j.envpol.2023.122988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 11/11/2023] [Accepted: 11/16/2023] [Indexed: 11/24/2023]
Abstract
The Rio Negro basin of Amazonia (Brazil) is a hotspot of fish biodiversity that is under threat from copper (Cu) pollution. The very ion-poor blackwaters have a high dissolved organic carbon (DOC) concentration. We investigated the Cu sensitivity of nine Amazonian fish species in their natural blackwaters (Rio Negro). The acute lethal concentration of Cu (96 h LC50) was determined at different dilutions of Rio Negro water (RNW) in ion-poor well water (IPW), ranging from 0 to 100%. The IPW was similar to RNW in pH and ionic composition but deficient in DOC, allowing this parameter to vary 20-fold from 0.4 to 8.3 mg/L in tests. The Biotic Ligand Model (BLM; Windward version 3.41.2.45) was used to model Cu speciation and toxicity over the range of tested water compositions, and to estimate lethal Cu accumulations on the gills (LA50). The modeling predicted a high relative abundance of Cu complexes with DOC in test waters. As these complexes became more abundant with increasing RNW content, a concomitant decrease in free Cu2+ was observed. In agreement with this modeling, acute Cu toxicity decreased (i.e. 96 h LC50 values increase) with increasing RNW content. The three most sensitive species (Hemigrammus rhodostomus, Carnegiella strigatta and Hyphessobrycon socolofi) were Characiformes, whereas Corydoras schwartzi (Siluriformes) and Apistogramma agassizii (Cichliformes) were the most tolerant. These sensitivity differences were reflected in the BLM-predicted lethal gill copper accumulation (LA50), which were generally lower in Characiformes than in Cichliformes. Using these newly estimated LA50 values in the BLM allowed for accurate prediction of acute Cu toxicity in the nine Amazonian fish. Our data emphasize that the BLM approach is a promising tool for assessing Cu risk to Amazonian fish species in blackwater conditions characterized by very low concentrations of major ions but high concentrations of DOC.
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Affiliation(s)
- Rafael M Duarte
- Laboratory of Ecophysiology and Molecular Evolution, Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Brazil; Biosciences Institute, São Paulo State University - UNESP, Coastal Campus, São Vicente, SP, Brazil.
| | - Anne Crémazy
- Centre Eau Terre Environnement, Institut National de La Recherche Scientifique, Québec, QC, G1K 9A9, Canada
| | - Chris M Wood
- Laboratory of Ecophysiology and Molecular Evolution, Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Brazil; Department of Zoology, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada; Department of Biology, McMaster University, Hamilton, ON, L8S 4K1, Canada
| | - Vera M F Almeida-Val
- Laboratory of Ecophysiology and Molecular Evolution, Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Brazil
| | - Adalberto L Val
- Laboratory of Ecophysiology and Molecular Evolution, Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Brazil
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Kong M, Shi Z, Liu F, Song N, Liu L, Li R, Wu Y, Xu H. Investigation and prediction of the biotoxicity of Cu 2+ to Chlorella vulgaris: modification of the biotic ligand model. Environ Sci Pollut Res Int 2023; 30:110612-110622. [PMID: 37792195 DOI: 10.1007/s11356-023-30165-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 09/26/2023] [Indexed: 10/05/2023]
Abstract
The increased copper ion (Cu2+) concentrations in aquatic ecosystem significantly influence the environmental quality and ecosystem safety, while information on the Cu2+ biotoxicity to aquatic microorganisms and the models for biotoxicity prediction are still unclear. In this study, the toxicities of Cu2+ to Chlorella vulgaris under different environmental conditions (e.g., Na+, K+, Ca2+, Mg2+, pH, and dissolved organic matter) were explored, with the experimental results in comparison with those predicted by the biotic ligand model (BLM). Results showed that increased Cu2+ concentration caused obvious toxicities to C. vulgaris, whereas the commonly occurring cations and dissolved organic matters can protect the metabolism system of C. vulgaris. The presence of extracellular polymeric substances (EPS) matrix can alleviate the biotoxicity via increasing the surface biosorption but decreasing cell internalization of Cu2+ in C. vulgaris. Due to the presence of EPS matrix, the experimental biotoxicity results under each condition were significantly lower than those predicted by the BLM model, which was thus modified via taking the EPS matrix as the supplement of allochthonous organic matters. After that, the modified BLM was characterized with a higher degree of precision and can be used in natural waters for biotoxicity prediction. Results obtained can enhance our insights into the ecological effects and biotoxicity prediction of heavy metals in natural aquatic ecosystems.
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Affiliation(s)
- Ming Kong
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing, 210042, China
| | - Zhiqiang Shi
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Fei Liu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Na Song
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Lizhen Liu
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang, 330096, China
| | - Rongfu Li
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang, 330096, China
| | - Yongming Wu
- Institute of Microbiology, Jiangxi Academy of Sciences, Nanchang, 330096, China
| | - Huacheng Xu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
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Luo X, Wang X, Tang Y, Liu Y, Wang Y. Using quantitative ion character-activity relationship (QICAR) method in evaluation of metal toxicity toward wheat. Ecotoxicol Environ Saf 2021; 221:112443. [PMID: 34166939 DOI: 10.1016/j.ecoenv.2021.112443] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/31/2021] [Accepted: 06/18/2021] [Indexed: 06/13/2023]
Abstract
It is important to assess the toxic effects posed by soil pollutants toward plants. However, plant toxicology experiments normally involve a considerable amount of manpower, consumables and time. Therefore, the use of metal toxicity prediction models, independent of toxicity tests, is critical. In this study, we investigated the toxicity of different metal ions to wheat using hydroponic experiments. We employed the methods of soft-hard ion grouping, soft-hard ligand theory and K (conditional binding constant based on the biotic ligand model principle) in combination with hydroponic experiments to explore the application of quantitative ion character-activity relationships in predicting phytotoxicity. The results showed that the toxicity of the 19 metal ions tested varied significantly, with EC50 ranging from 0.27 μM to 4463.36 μM. The linear regression relationships between the toxicity of these metal ions and their physicochemical properties were poor (R2 = 0.237-0.331, p < 0.05). These relationships were improved after grouping the metals according to the soft-hard theory (R2 = 0.527-0.744 and p < 0.05 for soft ions; R2 = 0.445-0.743 and p < 0.05 for hard ions). The application of soft-hard ligand theory, based on the binding affinity of the metals to the ligands, showed poor prediction of the phytotoxicity of metals, with R2 = 0.413 (p = 0.024) for the softness consensus scale (σCon) and R2 = 0.348 (p = 0.218) for the normalized hard ligands scale (HLScale). However, the method of K provided the closest fit in predicting toxicity (R2 = 0.803, p < 0.001). Our results showed that the application of soft-hard ion grouping and log K can improve prediction of the phytotoxicity of metals relatively well, which can potentially be used for deriving the toxicity of elements with limited toxicity data.
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Affiliation(s)
- Xiaorong Luo
- College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
| | - Xuedong Wang
- College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China.
| | - Yujie Tang
- College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
| | - Yanju Liu
- Global Centre for Environmental Remediation, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Ying Wang
- School of Space and Environment, Beihang University, Beijing 100191, China
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Chung J, Hwang DS, Park DH, An YJ, Yeom DH, Park TJ, Choi J, Lee JH. Derivation of acute copper biotic ligand model-based predicted no-effect concentrations and acute-chronic ratio. Sci Total Environ 2021; 780:146425. [PMID: 34030286 DOI: 10.1016/j.scitotenv.2021.146425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/08/2021] [Accepted: 03/08/2021] [Indexed: 06/12/2023]
Abstract
The copper biotic ligand model (BLM) can quantitatively describe the bioavailability depending on various environmental factors and has been used to derive the predicted no-effect concentrations (PNECs). The commonly employed acute BLM tool, HydroQual, which applies the biotic ligand constants of fathead minnow in the same model structure for all taxonomic groups, estimates lower acute copper toxicity values compared to the chronic copper PNECs of the European Union Risk Assessment Reports (EU-RAR), which are based on taxon-specific model structures and biotic ligand constants for vertebrates, invertebrates, and algae. In this study, the full-BLM approach was applied using an appropriate acute BLM for each taxonomic group to derive acute HC5s (fifth percentile value in the species sensitivity distribution [SSD]) and an acute-chronic ratio for copper. Two acute BLMs for vertebrates and invertebrates were used and validated against site waters using the new method to estimate the intrinsic sensitivity for each species across different environmental conditions. To derive acute copper full BLM-based HC5s in Korean freshwater, acute toxicity tests were performed with 10 indigenous species, which were used to build the acute BLM-based SSD at each site. The final estimated acute full-BLM HC5s were higher than the EU-RAR chronic PNECs within the BLM calibration range. Furthermore, a linear relationship was observed between the acute full-BLM HC5s and the EU-RAR chronic PNECs. This linear regression function was suggested as an acute to chronic transformation function that can be applied to calculate chronic PNEC values. In conclusion, if the chronic ecotoxicity database of indigenous aquatic organisms for copper is lacking, it may be more efficient to derive chronic PNECs using an acute-chronic ratio after deriving BLM-based acute copper SSDs for indigenous species within representative taxonomic groups. This study provides a scientific foundation for the derivation of water quality criteria for copper in freshwater.
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Affiliation(s)
- Jiwoong Chung
- Environmental Health & Safety Research Institute, EH Research & Consulting Co. Ltd., E TechHive, 410, Jeongseojin-ro, Seo-gu, Incheon, Republic of Korea; School of Environmental Engineering, Graduate School of Energy and Environmental System Engineering, University of Seoul, 90 Jeonnong-dong, Dongdaemun-gu, Seoul, Republic of Korea
| | - Dae-Sik Hwang
- Environmental Health & Safety Research Institute, EH Research & Consulting Co. Ltd., E TechHive, 410, Jeongseojin-ro, Seo-gu, Incheon, Republic of Korea
| | - Dong-Ho Park
- Environmental Health & Safety Research Institute, EH Research & Consulting Co. Ltd., E TechHive, 410, Jeongseojin-ro, Seo-gu, Incheon, Republic of Korea
| | - Youn-Joo An
- Department of Environmental Health Science, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, Republic of Korea
| | - Dong-Hyuk Yeom
- Korea Institute of Toxicology, 17, Jegok-gil, Munsan-eup, Jinju-si, Gyeongsangnam-do 52834, Republic of Korea
| | - Tae-Jin Park
- Water Environmental Engineering Research Division, National Institute of Environmental Research, Incheon, Republic of Korea
| | - Jinhee Choi
- School of Environmental Engineering, Graduate School of Energy and Environmental System Engineering, University of Seoul, 90 Jeonnong-dong, Dongdaemun-gu, Seoul, Republic of Korea
| | - Jong-Hyeon Lee
- Environmental Health & Safety Research Institute, EH Research & Consulting Co. Ltd., E TechHive, 410, Jeongseojin-ro, Seo-gu, Incheon, Republic of Korea.
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6
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Wang F, Song N. Modeling of selenite toxicity to wheat root elongation using biotic ligand model: Considering the effects of pH and phosphate anion. Environ Pollut 2021; 272:115935. [PMID: 33223336 DOI: 10.1016/j.envpol.2020.115935] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 10/06/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
It has not been well understood that the binding affinity and potential toxicity of different chemical forms of selenite (Se(IV)), which are predominant forms of selenium with plant availability. The influences of pH and major anions on Se(IV) toxicity to wheat root elongation were determined in solutions and modeled based on the biotic ligand model (BLM) and free ion activity model (FIAM) concepts. Results showed that EC50[Se(IV)]T values increased from 164 to 273 μM as the pH raised from 4.5 to 8.0, indicating the increase of pH induced weakened Se(IV) toxicity. The EC50{SeO32-} values increased from 0.019 to 71.3 μM while the EC50{H2SeO3} values sharply decreased from 2.08 μM to 0.760 nM with the pH increasing from 4.5 to 8.0. The effect of pH on Se(IV) toxicity could be explained by the changes of Se(IV) species in different pH solutions as H2SeO3, HSeO3- and SeO32- were differently toxic to wheat root elongation. The toxicity of Se(IV) decreased with increasing H2PO4- activity but not for SO42-, NO3- and Cl- activities, indicating that only H2PO4- had a competitive effect with Se(IV) on the binding sites. A site-specific BLM was developed to count in effects of pH and H2PO4-, and stability constants of H2SeO3, HSeO3-, SeO32- and H2PO4- to the binding sites were obtained: log [Formula: see text] = 4.96, log [Formula: see text] = 3.47, log [Formula: see text] = 2.56 and log [Formula: see text] = 2.00. Results implied that BLM performed much better than FIAM in the wheat root elongation prediction when coupling toxic species H2SeO3, HSeO3-, SeO32-, and the competitions of H2PO4- for the binding sites while developing the Se(IV)-BLM.
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Affiliation(s)
- Fangli Wang
- Qingdao Engineering Research Center for Rural Environment, School of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, PR China
| | - Ningning Song
- Qingdao Engineering Research Center for Rural Environment, School of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, PR China.
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Wang F, Wang X, Chen Q, Song N. Extension of a biotic ligand model for predicting the toxicity of metalloid selenate to wheat: The effects of pH, phosphate and sulphate. Chemosphere 2021; 264:128424. [PMID: 33032220 DOI: 10.1016/j.chemosphere.2020.128424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/17/2020] [Accepted: 09/22/2020] [Indexed: 06/11/2023]
Abstract
It has not been well understood that the influences of pH and accompanying anions on the toxicity of selenate (Se(VI)). The influences of pH and major anions on Se(VI) toxicity to wheat root elongation were determined and modeled based on the biotic ligand model (BLM) and free ion activity model (FIAM) concepts. Results showed that EC50[Se(VI)]T values increased from 162 to 251 μM as the pH values increased from 4.5 to 8.0, indicating that the pH increases alleviated the Se(VI) toxicity. The EC50{SeO42-} values increased from 133 to 203 μM while the EC50{HSeO4-} values sharply decreased from 210 to 0.102 nM with the pH increasing from 4.5 to 8.0. The effect of pH on Se(VI) toxicity could be explained by the changes of Se(VI) species in different pH solutions as SeO42- and HSeO4-were differently toxic to wheat root elongation. The toxicity of Se(VI) decreased with the increasing activities of H2PO4- and SO42- but not for NO3- and Cl- activities, indicating that only H2PO4- and SO42- had competitive effects with Se(VI) on the binding sites. An extended BLM was developed to consider effects of pH, phosphate and sulphate, and stability constants of SeO42-, HSeO4-, H2PO4- and SO42- to the binding sites were obtained: log [Formula: see text] = 3.45, log [Formula: see text] = 5.98, log [Formula: see text] = 2.05, log [Formula: see text] = 1.85. Results implied that BLM performed much better than FIAM in the wheat root elongation prediction when coupling with toxic species SeO42- and HSeO4-, and the competitions of H2PO4- and SO42- for the binding sites while developing the Se(VI)-BLM.
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Affiliation(s)
- Fangli Wang
- Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China
| | - Xuexia Wang
- Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Qinghua Chen
- Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China
| | - Ningning Song
- Qingdao Engineering Research Center for Rural Environment/School of Resources and Environment, Qingdao Agricultural University, Qingdao, 266109, China.
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Wang X, Song N. An improved biotic ligand model (BLM) for predicting Co(II)-toxicity to wheat root elongation: The influences of toxic metal speciation and accompanying ions. Ecotoxicol Environ Saf 2019; 182:109433. [PMID: 31319244 DOI: 10.1016/j.ecoenv.2019.109433] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 06/25/2019] [Accepted: 07/07/2019] [Indexed: 06/10/2023]
Abstract
In order to explore the effects of pH and accompanying ions on divalent cobalt (Co(II)) toxicity to the wheat root elongation, an improved biotic ligand model (BLM) to predict Co(II) toxicity was developed in solution culture. The results showed that the Co(II)-toxicity decreased with the increases of K+, Ca2+ and Mg2+ activities, and the activity of Na+ had no impact on the Co(II)-toxicity. High H+ activity reduced the Co(II)-toxicity by the competitive effect of H+, while low H+ activity affected the toxicity by the change in the type of Co(II) in culture medium. Co2+ and CoOH+ were toxic to wheat root elongation, and Co(OH)2 was not. On the basis of BLM theory, the conditional equilibrium constants for Co2+, CoOH+, H+, Mg2+, Ca2+, K+ were obtained: logKCoBL = 4.65, logKCoOHBL = 6.62, logKHBL = 4.53, logKMgBL = 3.65, logKCaBL = 2.36 and logKKBL = 2.17. Free Co2+ and CoOH+, and the competitions of K+, Mg2+ and Ca2+ were suggested to be considered when developing the Co(II)-BLM.
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Affiliation(s)
- Xuru Wang
- Qingdao Engineering Research Center for Rural Environment, College of Resource and Environment, Qingdao Agricultural University, Qingdao, Shandong, 266109, PR China; College of Marine Sciences, Shanghai Ocean University, Shanghai, 201306, PR China
| | - Ningning Song
- Qingdao Engineering Research Center for Rural Environment, College of Resource and Environment, Qingdao Agricultural University, Qingdao, Shandong, 266109, PR China.
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9
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Meng X, Wang X, Ma Y, Wang Y. Development of a coupled model of quantitative ion character-activity relationships-biotic ligand model (QICARs-BLM) for predicting toxicity for data poor metals. J Hazard Mater 2019; 373:620-629. [PMID: 30953979 DOI: 10.1016/j.jhazmat.2019.03.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 03/18/2019] [Accepted: 03/21/2019] [Indexed: 06/09/2023]
Abstract
The biotic ligand model (BLM) is proposed as a tool to quantitatively evaluate biological toxicity of metals considering both metal speciation and the influence of environmental conditions. The model assumes that biological sites bind to metals as biotic ligands (BLs) and obtains a series of BLM parameters including conditional binding constants (K). However, developing a BLM for each metal and biology takes a lot of experimentation. In the present study, relationships between metal ionic characters and BLM parameter K were respectively investigated for three terrestrial organisms. The results showed that ionization potential was the most strongly related to log K for barley (R2 = 0.845, p < 0.01) and earthworm (R2 = 0.881, p < 0.01), and electronegativity index most significantly related to log K for lettuce (R2 = 0.835, p < 0.01). Based on these relationships, a set of quantitative ion character-activity relationships (QICARs) were developed for predicting log K of metals. Then the QICAR were coupled with BLM and a novel QICAR-BLM was constructed. Finally, the QICAR-BLM was applied to predict EC50 of other unknown-toxicity metals for selected species, and compensate for the lack of toxicity data for a large number of metals in soil.
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Affiliation(s)
- Xiaoqi Meng
- The Key Lab of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China
| | - Xuedong Wang
- The Key Lab of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China.
| | - Yibing Ma
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangzhou, 510650, China.
| | - Ying Wang
- School of Space and Environment, Beihang University, Beijing, 100191, China
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Nys C, Janssen CR, De Schamphelaere KAC. The effect of pH on chronic zinc toxicity differs between daphnid species: Development of a preliminary chronic zinc Ceriodaphnia dubia bioavailability model. Environ Toxicol Chem 2017; 36:2750-2755. [PMID: 28436057 DOI: 10.1002/etc.3831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 01/30/2017] [Accepted: 04/21/2017] [Indexed: 06/07/2023]
Abstract
In the present study, we observed that the chronic Zn Daphnia magna biotic ligand model (BLM) could not accurately predict the chronic Zn toxicity to Ceriodaphnia dubia in a series of (modified) field waters, although the intrinsic sensitivities of the D. magna BLM were specifically calibrated on the sensitivity of C. dubia. Moreover, it was observed that the D. magna BLM underestimated the effect of pH on the toxicity of the free Zn2+ ion. A preliminary species-specific chronic Zn C. dubia bioavailability model was developed based on the data. The preliminary Zn C. dubia bioavailability model was shown to predict Zn toxicity to C. dubia in a series of natural waters with pH ranging between 7 and 8.3 with reasonable accuracy. The difference in the effect of pH on Zn2+ toxicity between D. magna and C. dubia (2 phylogenetically closely related species) suggested by our results deserves further attention because of the importance of the cross-species application of bioavailability models in ecological risk-assessment procedures and environmental quality standard derivations for metals. Environ Toxicol Chem 2017;36:2750-2755. © 2017 SETAC.
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Affiliation(s)
- Charlotte Nys
- Laboratory of Environmental Toxicology and Aquatic Ecology, Universiteit Gent Campus Coupure, Gent, Belgium
| | - Colin R Janssen
- Laboratory of Environmental Toxicology and Aquatic Ecology, Universiteit Gent Campus Coupure, Gent, Belgium
| | - Karel A C De Schamphelaere
- Laboratory of Environmental Toxicology and Aquatic Ecology, Universiteit Gent Campus Coupure, Gent, Belgium
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11
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Song N, Ma Y. The toxicity of HCrO 4- and CrO 42- to barley root elongation in solution culture: pH effect and modelling. Chemosphere 2017; 171:537-543. [PMID: 28039832 DOI: 10.1016/j.chemosphere.2016.12.050] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2016] [Revised: 11/30/2016] [Accepted: 12/10/2016] [Indexed: 06/06/2023]
Abstract
The influence of pH on the toxicity of Cr(VI) to barley root elongation was studied in solution culture to better understand the toxicity of different species of Cr(VI). Results showed that the values of EC50{CrO42-} (the free CrO42- that results in50% of barley root elongation with respect to the control) increased when the pH increased from 4.5 to 6.5; however, it was not significantly different in the high-pH range from 7.0 to 8.5. The nonlinear relationship between EC50{CrO42-} and OH- activity indicated that OH- competition with Cr(VI) on cell membrane ligands was not strong. There was a good linear relationship (R2 = 0.99) between the ratio of HCrO4- activity to CrO42- activity and Cr(VI) toxicity to barley root elongation when the toxicity of HCrO4- were considered, indicating that the observed toxicity of Cr(VI) in the high pH range may be caused by HCrO4- and CrO42- in solution. It was found that HCrO4- had a greater binding affinity than CrO42- on the biotic ligand sites. The logistic dose-response curves showed that consideration of Cr(VI) dose as HCrO4- and CrO42- significantly improved the data fit compared to consideration of the activity of HCrO4- or CrO42- only. The present study suggested that HCrO4- was highly toxic to the root of barely, and both HCrO4- and CrO42- species needed to be considered when predicting the toxicity of Cr(VI) under different pH conditions.
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Affiliation(s)
- Ningning Song
- Qingdao Engineering Research Center for Rural Environment, College of Resource and Environment, Qingdao Agricultural University, Qingdao, Shandong, 266109, PR China; National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China
| | - Yibing Ma
- National Soil Fertility and Fertilizer Effects Long-term Monitoring Network, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China; School of Resources and Environment, University of Jinan, Jinan, Shandong, 250022, PR China.
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Crémazy A, Wood CM, Smith DS, Ferreira MS, Johannsson OE, Giacomin M, Val AL. Investigating copper toxicity in the tropical fish cardinal tetra (Paracheirodon axelrodi) in natural Amazonian waters: Measurements, modeling, and reality. Aquat Toxicol 2016; 180:353-363. [PMID: 27969548 DOI: 10.1016/j.aquatox.2016.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 09/29/2016] [Accepted: 10/13/2016] [Indexed: 06/06/2023]
Abstract
Copper at high concentrations is an ionoregulatory toxicant in fish and its toxicity is known to be strongly modulated by the water chemistry. The toxicity of Cu to the tropical fish cardinal tetra (Paracheirodon axelrodi) was investigated in waters from two major rivers of the Amazon watershed: the Rio Negro (filtered <0.45μm, pH 5.6, DOC=8.4 mgL-1, Na=33μM, Ca=8μM) and the Rio Solimões (filtered <0.45μm, pH 6.7, DOC=2.8 mgL-1, Na=185μM, Ca=340μM), as well as in a natural "reference water" (groundwater) which was almost DOC-free (pH 6.0, DOC=0.34 mgL-1, Na=53μM, Ca=5μM). Acute 96-h mortality, Cu bioaccumulation and net flux rates of Na+, Cl-, K+ and total ammonia were determined in P. axelrodi exposed in each water. Copper speciation in each water was determined by two thermodynamic models and by potentiometry, and its toxicity was predicted based on the biotic ligand model (BLM) framework. Our results indicate that high Na+ loss is the main mode of toxic action of Cu in P. axelrodi, in accordance with general theory. Cardinal tetra showed a particularly high ability to tolerate Cu and to maintain Na+ balance, similar to the ability of this and other endemic Rio Negro species to tolerate low pH and ion-poor conditions. Cu toxicity was lower in Rio Negro than in the other two waters tested, and the free [Cu2+] at the LC50, as determined by any of the three speciation methods tested, was approximately 10-fold higher. This variation could not be captured by a realistic set of BLM parameters. At least in part, this observation may be due to gill physiological alterations induced by the abundant dissolved organic matter of the Rio Negro. The implication of this observation is that, for metals risk assessment in tropical waters, similar to the Rio Negro, care must be used in applying BLM models developed using temperate DOC and temperate species.
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Affiliation(s)
- Anne Crémazy
- Department of Zoology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
| | - Chris M Wood
- Department of Zoology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - D Scott Smith
- Department of Chemistry and Biochemistry, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada
| | - Márcio S Ferreira
- Laboratory of Ecophysiology and Molecular Evolution, National Institute for Amazonian Research, Manaus, AM, Brazil
| | - Ora E Johannsson
- Department of Zoology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Marina Giacomin
- Department of Zoology, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Adalberto L Val
- Laboratory of Ecophysiology and Molecular Evolution, National Institute for Amazonian Research, Manaus, AM, Brazil
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Wang X, Wu M, Ma J, Chen X, Hua L. Modeling of acute cadmium toxicity in solution to barley root elongation using biotic ligand model theory. J Environ Sci (China) 2016; 42:112-118. [PMID: 27090701 DOI: 10.1016/j.jes.2015.06.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Revised: 06/02/2015] [Accepted: 06/16/2015] [Indexed: 06/05/2023]
Abstract
Protons (H(+)) as well as different major and trace elements may inhibit cadmium (Cd) uptake in aquatic organisms and thus alleviate Cd toxicity. However, little is known about such interactions in soil organisms. In this study, the independent effects of the cations calcium (Ca(2+)), magnesium (Mg(2+)), potassium (K(+)), H(+) and zinc (Zn(2+)) on Cd toxicity were investigated with 5-day long barley root elongation tests in nutrient solutions. The tested concentrations of selected cations and trace metal ions were based on the ranges that occur naturally in soil pore water. The toxicity of Cd decreased with increasing activity of Ca(2+), Mg(2+), H(+) and Zn(2+), but not K(+). Accordingly, conditional binding constants were obtained for the binding of Cd(2+), Ca(2+), Mg(2+), H(+), and Zn(2+) with the binding ligand: logK(CdBL) 5.19, logK(CaBL) 2.87, logK(MgBL) 2.98, logK(HBL) 5.13 and logK(ZnBL) 5.42, respectively. Furthermore, it was calculated that on average 29% of the biotic ligand sites needed to be occupied by Cd to induce a 50% decrease in root elongation. Using the estimated constants, a biotic ligand model was successfully developed to predict the Cd toxicity to barley root elongation as a function of solution characteristics. The feasibility and accuracy of its application for predicting Cd toxicity in soils were discussed.
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Affiliation(s)
- Xuedong Wang
- The Key Lab of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China.
| | - Mingyan Wu
- The Key Lab of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
| | - Jingxing Ma
- The Key Lab of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
| | - Xiaolin Chen
- The Key Lab of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
| | - Luo Hua
- The Key Lab of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
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