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Liang W, Zhang Z, Zhu Q, Han Z, Huang C, Liang X, Yang M. Molecular interactions between bovine serum albumin (BSA) and trihalophenol: Insights from spectroscopic, calorimetric and molecular modeling studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 287:122054. [PMID: 36334416 DOI: 10.1016/j.saa.2022.122054] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Revised: 10/13/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
The issue of disinfection byproducts (DBPs) in the water has received critical attention due to the health effects on humans. In the water environment, interactions between bovine serum albumins (BSA), the most abundant water-soluble protein, and DBPs unavoidably occur. In this study, comparative binding interactions of two aromatic DBPs - 2,4,6-trichlorophenol (TCP) and 2,4,6-tribromophenol (TBP) with BSA were investigated systematically utilizing fluorescence spectrometry, UV absorption spectrometry, isothermal titration calorimetry and molecular docking approach. The fluorescence quenching results indicated that TCP/TBP could quench the endogenous fluorescence of BSA through static quenching mechanisms, and TBP showed a more substantial quenching effect. The binding constants were determined for TCP-BSA (3.638 × 105 L/mol, 303 K) and TBP-BSA (6.394 × 105 L/mol, 303 K) complexes, with TBP showing higher binding affinity than TCP. The thermodynamic study and docking analysis suggested that hydrogen bonding and van der Waals forces were the primary interaction forces. Both of TCP and TBP were located in the subdomain IIIA of BSA, and TBP could form more stable complex than TCP. The results of the present study contributed valuable information on the environmental behaviors of halophenols in water environment from perspectives of binding with BSA.
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Affiliation(s)
- Wenjie Liang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Zhenxuan Zhang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China; College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen, 518060, PR China
| | - Qingyao Zhu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Zekun Han
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Cui Huang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China
| | - Xiong Liang
- College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen, 518060, PR China
| | - Mengting Yang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China.
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Chow ATS, Ulus Y, Huang G, Kline MA, Cheah WY. Challenges in quantifying and characterizing dissolved organic carbon: Sampling, isolation, storage, and analysis. JOURNAL OF ENVIRONMENTAL QUALITY 2022; 51:837-871. [PMID: 35899915 DOI: 10.1002/jeq2.20392] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
Despite the advancements in analytical techniques, there are still great challenges and difficulties in accurately and effectively quantifying and characterizing dissolved organic carbon (DOC) in environmental samples. The objectives of this review paper are (a) to understand the roles and variability of DOC along the water continuum; (b) to identify the constraints, inconsistences, limitations, and artifacts in DOC characterization; and (c) to provide recommendations and remarks to improve the analytical accuracy. For the first objective, we summarize the four ecological and engineering roles of DOC along the water continuum from source water to municipal utility, including nutrients and energy sources, controlling the fates of micropollutants, buffering capacity, and treatability and precursors of disinfection byproducts. We also discuss three major challenges in DOC analysis, including spatial and temporal variations, degradability and stability, and unknown structures and formulas. For the second objective, we review the procedures and steps in DOC analysis, including sampling in diverse environmental matrices, isolation of DOC fraction, storage and preservation techniques, and analyses on bulk chemical characteristics. We list and discuss the available options and evaluate the advantages and disadvantages of each choice. Last, we provide recommendations and remarks for each stage: sampling, isolation, storage, and analysis.
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Affiliation(s)
- Alex Tat-Shing Chow
- Biogeochemistry & Environmental Quality Research Group, Clemson Univ., Clemson, SC, 29634, USA
- Baruch Institute of Coastal Ecology & Forest Science, Clemson Univ., Clemson, SC, 29634, USA
| | - Yener Ulus
- Biogeochemistry & Environmental Quality Research Group, Clemson Univ., Clemson, SC, 29634, USA
| | - Guocheng Huang
- Dep. of Environmental Science and Engineering, Fuzhou Univ., Minhou, Fujian, 350108, P. R. China
| | - Michael Alan Kline
- Baruch Institute of Coastal Ecology & Forest Science, Clemson Univ., Clemson, SC, 29634, USA
| | - Wing-Yee Cheah
- Biogeochemistry & Environmental Quality Research Group, Clemson Univ., Clemson, SC, 29634, USA
- Baruch Institute of Coastal Ecology & Forest Science, Clemson Univ., Clemson, SC, 29634, USA
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Costa C, Assunção R, Sequeira D, Esteves F, Valdiglesias V, Laffon B, Teixeira JP, Madureira J. From trihalomethanes chronic daily intake through multiple exposure routes to cancer and non-cancer health risk assessment: Evidence from public Portuguese indoor swimming pools facilities using a probabilistic approach. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 818:151790. [PMID: 34808171 DOI: 10.1016/j.scitotenv.2021.151790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/27/2021] [Accepted: 11/14/2021] [Indexed: 06/13/2023]
Abstract
This study aimed to estimate chronic daily intake (CDI) and to predict the attributable lifetime cancer risk (LCR) and hazard index (HI) from concurrent exposure to four trihalomethanes (THMs; chloroform, bromodichloromethane, dibromochloromethane and bromoform), via multiple exposure routes (oral ingestion, dermal contact and inhalation), among 238 non-competitive attendees of 10 Portuguese public indoor swimming pools (SPs), using a probabilistic approach based on Monte Carlo simulations. Exposure parameters of study participants were collected via questionnaires and THMs levels in SPs water were determined according the respective normative standards. The CDI for total THMs calculated for male and female participants considering all routes was 7.52 and 8.97 mg/kg/day, respectively. SP attendees presented higher CDI through inhalation than via the other two exposure routes, and chloroform was the compound contributing the most to total THMs CDI. The risk analysis indicated that the total LCR and HI from the targeted THMs were higher than the negligible risk levels (1 × 10-6 and 1, respectively) in the scenarios examined (central tendency exposure and reasonable maximum exposure), and the health risk for females was slightly higher than for males. This study suggests that there are possible adverse health risks, thus, to protect pool attendees, adequate mitigation measures, and comprehensive regulatory guidelines on individual THMs concentrations are needed.
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Affiliation(s)
- Carla Costa
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano 321, 4000-055 Porto, Portugal; EPIUnit-Institute of Public Health, University of Porto, Rua das Taipas 135, 4050-600 Porto, Portugal; Laboratory for Integrative and Translational Research in Population Health (ITR), Rua das Taipas 135, 4050-600 Porto, Portugal
| | - Ricardo Assunção
- CESAM-Centre for Environmental and Marine Studies, University of Aveiro, 3810-193 Aveiro, Portugal; Food and Nutrition Department, National Institute of Health, Avenida Padre Cruz, 1649-016 Lisboa, Portugal; NOVA National School of Public Health, Public Health Research Centre, Universidade NOVA de Lisboa, Av. Padre Cruz, 1600-560 Lisboa, Portugal
| | - Diana Sequeira
- EPIUnit-Institute of Public Health, University of Porto, Rua das Taipas 135, 4050-600 Porto, Portugal
| | - Filipa Esteves
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano 321, 4000-055 Porto, Portugal; EPIUnit-Institute of Public Health, University of Porto, Rua das Taipas 135, 4050-600 Porto, Portugal; Laboratory for Integrative and Translational Research in Population Health (ITR), Rua das Taipas 135, 4050-600 Porto, Portugal
| | - Vanessa Valdiglesias
- Universidade da Coruña, Grupo DICOMOSA, Centro de Investigaciones Científicas Avanzadas (CICA), Departamento de Biología, Facultad de Ciencias, Campus A Zapateira s/n, 15071 A Coruña, Spain; Instituto de Investigación Biomédica de A Coruña (INIBIC), AE CICA-INIBIC, Oza, 15071 A Coruña, Spain
| | - Blanca Laffon
- Instituto de Investigación Biomédica de A Coruña (INIBIC), AE CICA-INIBIC, Oza, 15071 A Coruña, Spain; Universidade da Coruña, Grupo DICOMOSA, Centro de Investigaciones Científicas Avanzadas (CICA), Departamento de Psicología, Facultad de Ciencias de la Educación, Campus Elviña s/n, 15071 A Coruña, Spain
| | - João Paulo Teixeira
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano 321, 4000-055 Porto, Portugal; EPIUnit-Institute of Public Health, University of Porto, Rua das Taipas 135, 4050-600 Porto, Portugal; Laboratory for Integrative and Translational Research in Population Health (ITR), Rua das Taipas 135, 4050-600 Porto, Portugal.
| | - Joana Madureira
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano 321, 4000-055 Porto, Portugal; EPIUnit-Institute of Public Health, University of Porto, Rua das Taipas 135, 4050-600 Porto, Portugal; Laboratory for Integrative and Translational Research in Population Health (ITR), Rua das Taipas 135, 4050-600 Porto, Portugal
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Kargaki S, Iakovides M, Stephanou EG. Study of the occurrence and multi-pathway health risk assessment of regulated and unregulated disinfection by-products in drinking and swimming pool waters of Mediterranean cities. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 739:139890. [PMID: 32554116 DOI: 10.1016/j.scitotenv.2020.139890] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/29/2020] [Accepted: 05/31/2020] [Indexed: 06/11/2023]
Abstract
The occurrence of a wide variety of regulated (four trihalomethanes (THM(4)), five haloacetic acids (HAA(5))) and unregulated (haloacetonitriles (HANs), halogenated ketones, chloropicrin, carbon tetrachloride, and other haloacetic acids) disinfection by-products (DBPs) was studied, in two hundred twenty-six finished drinking water samples collected in Barcelona (Spain, between 2008 and 2009), Athens (Greece, 2009-2010), Heraklion (Greece, 2009-2010), Nicosia (Cyprus, 2012-2013), and Limassol (Cyprus, 2011). The samples were analyzed by using liquid-liquid extraction, gas chromatography coupled with an electron capture detector or negative chemical ionization mass spectrometry. In addition, fourteen swimming pool water samples (from Heraklion and Athens) were also investigated regarding their DBPs content. The studied DBPs were determined concurrently with pH, total organic carbon (TOC), and bromide. Spearman's statistical analysis has shown statistically significant (p < 0.001) weak correlations between TOC, THM(4), HANs and HAA(5) but a strong correlation between THM(4) and HANs. Principal component analysis (PCA) on THM(4), HANs and HAA(5) provided a clear differentiation between the examined drinking waters, on the basis of their DBPs content. In the drinking water of coastal cities, the brominated DBPs dominated over the chlorinated ones, due to the higher bromide concentrations occurring in the corresponding raw waters. Lifetime cancer risk and hazard quotient by exposure to four THMs, dichlorocetic acid and trichloroacetic acid in drinking water and indoor swimming pools through multiple pathways were estimated. Total cancer unit risks in drinking water for Nicosia, Barcelona, Limassol and Athens exceeded in most cases the US EPA's regulatory threshold (1.0E-06). The total lifetime cancer risk evaluated for the studied indoor swimming pools was above the US EPA's negligible level for male, female, and junior swimmers.
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Affiliation(s)
- Sophia Kargaki
- Environmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, Panepistimioupoli Voutes, 70013 Heraklion, Greece
| | | | - Euripides G Stephanou
- Environmental Chemical Processes Laboratory, Department of Chemistry, University of Crete, Panepistimioupoli Voutes, 70013 Heraklion, Greece.
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Pándics T, Hofer Á, Dura G, Vargha M, Szigeti T, Tóth E. Health risk of swimming pool disinfection by-products: a regulatory perspective. JOURNAL OF WATER AND HEALTH 2018; 16:947-957. [PMID: 30540269 DOI: 10.2166/wh.2018.178] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
While disinfection of swimming pools is indispensable for microbiological safety, it may lead to the formation of disinfection by-products. Most studies agree that inhalation exposure is the predominant pathway of the associated health risks, but assumptions are based on concentrations measured in water and evaporation models. Pool water and air were sampled in 19 swimming pools. Trihalomethanes were detected in all sites; chloroform being the most abundant species. Concentrations ranged between 12.8-71.2 μg/L and 11.1-102.2 μg/m3 in pool water and air, respectively. The individual lifetime carcinogenic risk associated with chloroform in swimming pools exceeded 10-6 in all age groups for recreational swimmers and 10-5 for elite swimmers and staff, even if the pool complied with the national standards. Inhalation exposure was estimated and found to be the most relevant, however, different mass transfer models from water measurements significantly under- or overestimated the health burden compared to direct calculation from the concentration in air. The observed health risks call for defining regulatory values and monitoring requirement of indoor air quality in swimming pools.
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Affiliation(s)
- Tamás Pándics
- National Public Health Institute, Public Health Directorate, Albert Flórián út 2-6., H-1097 Budapest, Hungary E-mail:
| | - Ádám Hofer
- National Public Health Institute, Public Health Directorate, Albert Flórián út 2-6., H-1097 Budapest, Hungary E-mail:
| | - Gyula Dura
- National Public Health Institute, Public Health Directorate, Albert Flórián út 2-6., H-1097 Budapest, Hungary E-mail:
| | - Márta Vargha
- National Public Health Institute, Public Health Directorate, Albert Flórián út 2-6., H-1097 Budapest, Hungary E-mail:
| | - Tamás Szigeti
- National Public Health Institute, Public Health Directorate, Albert Flórián út 2-6., H-1097 Budapest, Hungary E-mail:
| | - Erika Tóth
- Department of Microbiology, Eötvös Loránd University of Sciences, Pázmány Péter sétány 1/C, H-1117, Hungary
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On the complexity of shark bite wounds: From associated bacteria to trauma management and wound repair. J Trauma Acute Care Surg 2018; 85:398-405. [PMID: 29613948 DOI: 10.1097/ta.0000000000001920] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The mouth of a shark is a breeding ground for a large variety of bacteria which can easily get transferred onto a human body in the event of a shark bite. Here, we review infections originating from shark oral bacterial flora, which originate from the microbiome of its prey, as well as from the surroundings where an incident takes place. We use the example of an incident which occurred in an aquarium involving a sandtiger shark, Carcharias taurus. In addition to a succinct analysis and interpretation of the wound and recovery process, an overview of currently known bacteria associated with shark bite wounds is given, as well as a summary of the effects of various previously tested antibiotics on bacteria derived from blacktip sharks, Carcharhinus limbatus, bull sharks, C. leucas, and tiger sharks, Galeocerdo cuvier. LEVEL OF EVIDENCE Therapeutic study, level V.
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Wang JJ, Dahlgren RA, Erşan MS, Karanfil T, Chow AT. Temporal variations of disinfection byproduct precursors in wildfire detritus. WATER RESEARCH 2016; 99:66-73. [PMID: 27135374 DOI: 10.1016/j.watres.2016.04.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 04/08/2016] [Accepted: 04/13/2016] [Indexed: 06/05/2023]
Abstract
The Rim Fire ignited on August 17, 2013 and became the third largest wildfire in California history. The fire consumed 104,131 ha of forested watersheds that were the drinking water source for 2.6 million residents in the San Francisco Bay area. To understand temporal variations in dissolved organic matter (DOM) after the wildfire and its potential impacts on disinfection byproduct (DBP) formation in source water supply, we collected the 0-5 cm ash/soil layer with surface deposits of white ash (high burn severity) and black ash (moderate burn severity) within the Rim Fire perimeter in Oct 2013 (pre-rainfall) for five sequential extractions, and in Dec 2013 (∼87 mm cumulative precipitation) and Aug 2014 (∼617 mm cumulative precipitation) for a single water extraction. Water-extractable DOM was characterized by absorption and fluorescence spectroscopy and DBP formation tests. Both increasing cumulative precipitation in the field or number of extractions in the lab resulted in a significant decrease in specific conductivity, dissolved organic carbon, and DBP formation potential, but an increase in DOM aromaticity (reflected by specific UV absorbance). However, the lab sequential leaching failed to capture the increase of the NOx(-)-N/NH4(+)-N ratio and the decrease in pH and dissolved organic carbon/nitrogen ratio of ash/soil extracts from Oct 2013 to Aug 2014. Increasing cumulative precipitation, inferring an increase in leaching after fire, led to an increase in DOM reactivity to form trihalomethanes, haloacetic acids, and chloral hydrate, but not for haloketones, haloacetonitrile, or N-nitrosodimethylamine, which were more related to the original burn severity. This study highlights that fire-affected DBP precursors for different DBP species have distinct temporal variation possibly due to their various sensitivity to biogeochemical alterations.
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Affiliation(s)
- Jun-Jian Wang
- Baruch Institute of Coastal Ecology & Forest Science, Clemson University, Georgetown, SC, 29442, USA
| | - Randy A Dahlgren
- Department of Land, Air and Water Resources, University of California - Davis, CA, 95616, USA
| | - Mahmut S Erşan
- Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, SC, 29625, USA
| | - Tanju Karanfil
- Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, SC, 29625, USA
| | - Alex T Chow
- Baruch Institute of Coastal Ecology & Forest Science, Clemson University, Georgetown, SC, 29442, USA; Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, SC, 29625, USA.
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Zhang H, Dong H, Adams C, Qiang Z, Luan G, Wang L. Formation and speciation of disinfection byproducts during chlor(am)ination of aquarium seawater. J Environ Sci (China) 2015; 33:116-124. [PMID: 26141884 DOI: 10.1016/j.jes.2014.11.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 11/23/2014] [Accepted: 12/01/2014] [Indexed: 06/04/2023]
Abstract
The chemistry associated with the disinfection of aquarium seawater is more complicated than that of freshwater, therefore limited information is available on the formation and speciation of disinfection byproducts (DBPs) in marine aquaria. In this study, the effects of organic precursors, bromide (Br-) and pre-ozonation on the formation and speciation of several typical classes of DBPs, including trihalomethanes (THM4), haloacetic acids (HAAs), iodinated trihalomethanes (I-THMs), and haloacetamides (HAcAms), were investigated during the chlorination/chloramination of aquarium seawater. Results indicate that with an increase in dissolved organic carbon concentration from 4.5 to 9.4 mg/L, the concentrations of THM4 and HAAs increased by 3.2-7.8 times under chlorination and by 1.1-2.3 times under chloramination. An increase in Br- concentration from 3 to 68 mg/L generally enhanced the formation of THM4, I-THMs and HAcAms and increased the bromine substitution factors of all studied DBPs as well, whereas it impacted insignificantly on the yield of HAAs. Pre-ozonation with 1 mg/L O3 dose substantially reduced the formation of all studied DBPs in the subsequent chlorination and I-THMs in the subsequent chloramination. Because chloramination produces much lower amounts of DBPs than chlorination, it tends to be more suitable for disinfection of aquarium seawater.
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Affiliation(s)
- Haiting Zhang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Huiyu Dong
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Craig Adams
- Department of Civil and Environmental Engineering, Utah State University, Logan, UT 84322, US
| | - Zhimin Qiang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Gang Luan
- Water Quality Analysis and Control Center, Department of Life Support Equipments for Aquatic Animals, Beijing Aquarium, Beijing 100081, China
| | - Lei Wang
- Water Quality Analysis and Control Center, Department of Life Support Equipments for Aquatic Animals, Beijing Aquarium, Beijing 100081, China
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Qiang Z, Zhang H, Dong H, Adams C, Luan G, Wang L. Formation of disinfection byproducts in a recirculating mariculture system: emerging concerns. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2015; 17:471-477. [PMID: 25573452 DOI: 10.1039/c4em00564c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Disinfection is commonly employed in recirculating mariculture systems (RMS) to control animal diseases and improve seawater quality; however, little is known about the occurrence of disinfection byproducts (DBPs) formed in such RMS. Beijing Aquarium is a typical RMS with artificially prepared seawater and mainly adopts a decentralized treatment strategy for different animal tanks, including sand filtration, foam fractionation, and disinfection (O3, UV, and O3/ClO2). This study reveals that the adopted disinfection processes were highly effective in controlling marine heterotrophic bacteria; however, some concerns were raised on the formation of various kinds of DBPs, including secondary oxidants, inorganic oxyanions, and hazardous organic species. Free chlorine and free bromine were generated from ozonation at health-relevant concentrations. High concentrations of BrO3(-) and ClO3(-) were formed in mammal tanks, which exceeded the USEPA-regulated maximum contaminant level (MCL) for drinking water by 19-25 and 52-54 times, respectively. Extremely high concentrations of NO3(-) were detected in mammal tanks, which considerably exceeded the MCL regulated by the Sea Water Quality Standard of China for the mariculture industry (Class II) by about 1100 times. Undoubtedly, the presence of various DBPs poses serious health threats to aquarium animals. To solve these problems, potential control measures for DBPs are proposed.
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Affiliation(s)
- Zhimin Qiang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
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