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Chen Y, Zhang Q, Zhang L, Liu X, Li Y, Liu R, Wang Y, Song Y, Li Y, Yin Y, Cai Y. Light-induced degradation of dimethylmercury in different natural waters. JOURNAL OF HAZARDOUS MATERIALS 2024; 470:134113. [PMID: 38565021 DOI: 10.1016/j.jhazmat.2024.134113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/20/2024] [Accepted: 03/21/2024] [Indexed: 04/04/2024]
Abstract
Photo-induced degradation of dimethylmercury (DMHg) is considered to be an important source for the generation of methylmercury (MMHg). However, studies on DMHg photodegradation are scarce, and it is even debatable about whether DMHg can be degraded in natural waters. Herein, we found that both DMHg and MMHg could be photodegraded in three natural waters collected from the Yellow River Delta, while in pure water only DMHg photodegradation occurred under visible light irradiation. The effects of different environmental factors on DMHg photodegradation were investigated, and the underlying mechanisms were elucidated by density functional theory calculations and a series of control experiments. Our findings revealed that the DMHg degradation rate was higher in the tidal creek water compared to Yellow River, Yan Lake, and purified water. NO3-, NO2-, and DOM could promote the photodegradation with DOM and NO3- showing particularly strong positive effects. Different light sources were employed, and UV light was found to be more effective in DMHg photodegradation. Moreover, MMHg was detected during the photodegradation of DMHg, confirming that the photochemical demethylation of DMHg is a source of MMHg in sunlit water. This work may provide a novel mechanistic insight into the DMHg photodegradation in natural waters and enrich the study of the global biogeochemical cycle of Hg.
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Affiliation(s)
- Yingying Chen
- Shandong Key Laboratory of Environmental Processes and Health, Qingdao Key Laboratory of Marine Pollutant Prevention, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
| | - Qingzhe Zhang
- Shandong Key Laboratory of Environmental Processes and Health, Qingdao Key Laboratory of Marine Pollutant Prevention, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China; Shenzhen Research Institute, Shandong University, Shenzhen 518057, China.
| | - Lian Zhang
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
| | - Xinning Liu
- Environment Research Institute, Shandong University, Qingdao 266237, China; Yantai Port United General Wharf Company, Yantai 264012, China
| | - Yanwei Li
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Runzeng Liu
- Shandong Key Laboratory of Environmental Processes and Health, Qingdao Key Laboratory of Marine Pollutant Prevention, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
| | - Yingjun Wang
- Shandong Key Laboratory of Environmental Processes and Health, Qingdao Key Laboratory of Marine Pollutant Prevention, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
| | - Yue Song
- Shandong Key Laboratory of Environmental Processes and Health, Qingdao Key Laboratory of Marine Pollutant Prevention, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
| | - Yanbin Li
- Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
| | - Yongguang Yin
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yong Cai
- Shandong Key Laboratory of Environmental Processes and Health, Qingdao Key Laboratory of Marine Pollutant Prevention, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China; Department of Chemistry & Biochemistry, Florida International University, Miami, FL 33199, United States.
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2
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Cugler de Pontes G, Vicente MDC, Kasper D, Machado WT, Wasserman JC. Spatial distribution of total mercury and methylmercury in the sediment of a tropical coastal environment subjected to heavy urban inputs. CHEMOSPHERE 2023; 312:137067. [PMID: 36397303 DOI: 10.1016/j.chemosphere.2022.137067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 07/26/2020] [Accepted: 10/27/2022] [Indexed: 06/16/2023]
Abstract
Jurujuba Cove is located in Guanabara Bay (adjacent to highly populated city of Rio de Janeiro, Brazil), which receives diffuse sources of contaminants along with two main freshwater inputs (the Cachoeira and Icaraí rivers), and hosts mussel farms. The main goal of this work was to evaluate the total mercury (THg) and methylmercury (MeHg) concentrations distributions in the sediments of the cove and their associations with physical and chemical parameters, thereby assessing their geochemical behavior. Twenty samples of surface sediments were collected and characterized for grain size, pH, redox potential, organic carbon, total phosphorus, THg and MeHg. Spatial distribution maps were produced for each parameter and a principal components analysis was carried out, to assess THg and MeHg behavior and their relationships with other parameters. The principal components analysis showed that grain size functions as the main diluting agent. The highest THg concentrations were observed in the mussel-farm area (656.1 ng g-1), and were related to fine grain size and elevated organic carbon values. High MeHg concentrations also occurred in the center of the cove, probably favored by high organic carbon content (low-energy environment). Total phosphorus concentrations indicate that Cachoeira River is a possible source of sewage, but little mercury seems to come from it. The results showed that although total mercury concentrations are elevated, with exception of a few locations, small methylmercury convertion rates were recorded in the sediments.
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Affiliation(s)
- Gabriela Cugler de Pontes
- Post-Graduation Program in Geochemistry, University Federal Fluminense, Outeiro São João Baptista s/n - Centro - Niterói, RJ. CEP, 24020-141. Brazil.
| | - Murilo de Carvalho Vicente
- Post-Graduation Program in Geochemistry, University Federal Fluminense, Outeiro São João Baptista s/n - Centro - Niterói, RJ. CEP, 24020-141. Brazil.
| | - Daniele Kasper
- Laboratory of Tracers Applied to Environmental Science Wolfgang Christian Pfeiffer; Institute of Biophysics Carlos Chagas Filho, University Federal of Rio de Janeiro, Avenida Carlos Chagas Filho, 373, Bloco G - Cidade Universitária - Ilha do Fundão, CEP: 21941-902, Rio de Janeiro - RJ, Brazil.
| | - Wilson Thadeu Machado
- Post-Graduation Program in Geochemistry, University Federal Fluminense, Outeiro São João Baptista s/n - Centro - Niterói, RJ. CEP, 24020-141. Brazil.
| | - Julio Cesar Wasserman
- Post-Graduation Program in Geochemistry, University Federal Fluminense, Outeiro São João Baptista s/n - Centro - Niterói, RJ. CEP, 24020-141. Brazil.
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West J, Gindorf S, Jonsson S. Photochemical Degradation of Dimethylmercury in Natural Waters. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:5920-5928. [PMID: 35442663 PMCID: PMC9069699 DOI: 10.1021/acs.est.1c08443] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 02/28/2022] [Accepted: 03/31/2022] [Indexed: 06/14/2023]
Abstract
Photochemical demethylation of dimethylmercury (DMHg) could potentially be an important source of monomethylmercury (MMHg) in sunlit water. Whether or not DMHg is photochemically degraded when dissolved in water is, however, debated. While an early study suggested DMHg dissolved in natural waters to readily degrade, later work claimed DMHg to be stable in seawater under natural sunlight and that early observations may be due to experimental artifacts. Here, we present experimental data showing that DMHg is readily degraded by photochemical processes in different natural waters (including water from a DOC-rich stream, the Baltic Sea, and the Arctic Ocean) as well as in artificial seawater and purified water. For most of the waters, the degradation rate constant (kd) for DMHg measured in indoor experiments exceeded, or was close to, the kd observed for MMHg. Outdoor incubations of DMHg in purified water and Arctic Ocean surface water further confirmed that DMHg is photochemically degraded under natural sunlight. Our study shows that DMHg is photochemically degraded in a range of natural waters and that this process may be a source of MMHg in sunlit waters where the supply or formation of DMHg is sufficient.
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Narukawa T, Iwai T, Chiba K. Simultaneous speciation analysis of inorganic arsenic and methylmercury in edible oil by high-performance liquid chromatography–inductively coupled plasma mass spectrometry. Talanta 2020; 210:120646. [DOI: 10.1016/j.talanta.2019.120646] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 12/06/2019] [Accepted: 12/13/2019] [Indexed: 10/25/2022]
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Wang Z, Sun T, Driscoll CT, Zhang H, Zhang X. Dimethylmercury in Floodwaters of Mercury Contaminated Rice Paddies. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:9453-9461. [PMID: 31402663 DOI: 10.1021/acs.est.8b07180] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Dimethyl mercury (CH3HgCH3, DMeHg) has been observed in upwelling marine environments and the deep ocean. However, little is known about the occurrence and mechanisms of DMeHg formation in freshwater environments. In this study, concentrations of dissolved gaseous DMeHg were investigated in floodwaters of rice paddies in China that have been contaminated by mercury from mining. Values of DMeHg in rice paddies were compared with measurements from nearshore surface seawater in the Bohai Gulf. High concentrations of dissolved gaseous DMeHg occurred in rice paddies. Average DMeHg concentration was 12 ± 22 pg L-1 with range of 0.39 to 91 pg L-1 in rice paddies at Shuijing, China, a site impacted by an abandoned mercury mine. These concentrations are comparable to those previously observed in the deep seawater and coastal upwelling environments (2.3-115pg L-1). An alkaline environment was found to be necessary for DMeHg formation in rice paddies. Associated incubation experiments showed that production of DMeHg in paddy soil was limited by Hg availability. Although iron amendments accelerated the production of gaseous methylmercury (MeHg) species to floodwaters, available Hg2+ is crucial for this production in flooded rice paddies. These observations are the first to demonstrate the occurrence of DMeHg and reveal factors affecting DMeHg production in rice paddies. Given the high volatility of DMeHg, these measurements also suggest a source for observations of MeHg in atmospheric deposition and advance understanding of a potentially important aspect of the biogeochemical cycling of Hg.
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Affiliation(s)
- Zhangwei Wang
- Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Ting Sun
- Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Charles T Driscoll
- Department of Civil and Environmental Engineering , Syracuse University , 151 Link Hall, Syracuse , New York 13244 , United States
| | - Huan Zhang
- Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Xiaoshan Zhang
- Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
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Fiori CDS, Rodrigues APDC, Vieira TC, Sabadini-Santos E, Bidone ED. An alternative approach to bioaccumulation assessment of methyl-Hg, total-Hg, Cd, Pb, Zn in bivalve Anomalocardia brasiliana from Rio de Janeiro bays. MARINE POLLUTION BULLETIN 2018; 135:418-426. [PMID: 30301054 DOI: 10.1016/j.marpolbul.2018.07.045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 07/05/2018] [Accepted: 07/17/2018] [Indexed: 06/08/2023]
Abstract
We present an alternative approach for establishing in situ bioaccumulation assessment of methyl-Hg (MeHg), total-Hg, Cd, Pb and Zn in bivalve Anomalocardia brasiliana from four bays of Rio de Janeiro presenting varying degrees of eutrophication, acid volatile sulfides (2-55 μmol g-1), simultaneously extracted metals (SEM) and total metals (TM) in sediments. Using metal concentrations of composite samples from three size classes of bivalve and their incorporation rates (IR = metal concentration / total length), which depend on exposure time, we calculated asymptotic IR and respective consequent metal concentrations. Both IR and the metal concentration presented inverse relationships with total length (excepting MeHg) and bay contamination. Lead and zinc concentrations were above Brazilian legal criteria in the most anoxic and contaminated bay, suggesting significant metal bioavailability (SEM/TM between 8% and 63%).
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Affiliation(s)
- Cristiane da Silveira Fiori
- de Pós-Graduação em Geociências (Geoquímica), Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-150, Brazil
| | - Ana Paula de Castro Rodrigues
- de Pós-Graduação em Geociências (Geoquímica), Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-150, Brazil
| | - Thatianne Castro Vieira
- de Pós-Graduação em Geociências (Geoquímica), Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-150, Brazil
| | - Elisamara Sabadini-Santos
- de Pós-Graduação em Geociências (Geoquímica), Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-150, Brazil.
| | - Edison Dausacker Bidone
- de Pós-Graduação em Geociências (Geoquímica), Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-150, Brazil
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Wang Z, Sun T, Driscoll CT, Yin Y, Zhang X. Mechanism of Accumulation of Methylmercury in Rice ( Oryza sativa L.) in a Mercury Mining Area. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:9749-9757. [PMID: 30129363 DOI: 10.1021/acs.est.8b01783] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Rice consumption is the primary pathway for methylmercury (MeHg) exposure at inland mercury (Hg) mining areas of China. The sources and processes of formation and translocation for MeHg in rice plant are complex and remain largely unknown. In this study, rice ( Oryza sativa L.) was exposed to isotopically labeled dimethylmercury (DMe199Hg) in field experiments using open top chambers to explore the response of MeHg accumulation in rice tissues to different levels of DMe199Hg in air. Rice leaves assimilated DMeHg from air, which was subsequently largely stored in aboveground tissues, including the rice grain, with only a small amount reaching the root. Combining these experimental results with field investigations of DMeHg concentrations in air beneath the rice canopy in a Hg mining area, we estimate that 15.5%, 10.8%, and 8.50% MeHg in the brown rice, the leaf, and the upper stalk, respectively, could be derived from atmospheric sources of DMeHg, while 99.5% of MeHg in rice root originated from the rice soil-water system. These findings help refine the mechanism of MeHg accumulation in rice that, in addition to soil, a fraction of MeHg in rice plants can be derived from DMeHg emissions from flooded rice paddies in Hg mining areas.
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Affiliation(s)
- Zhangwei Wang
- Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , No. 18 Shuangqing Road , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Ting Sun
- Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , No. 18 Shuangqing Road , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Charles T Driscoll
- Department of Civil and Environmental Engineering , Syracuse University , 151 Link Hall , Syracuse , New York 13244 , United States
| | - Yongguang Yin
- Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , No. 18 Shuangqing Road , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Xiaoshan Zhang
- Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , No. 18 Shuangqing Road , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
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8
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Chung SWC, Chan BTP. A reliable method to determine methylmercury and ethylmercury simultaneously in foods by gas chromatography with inductively coupled plasma mass spectrometry after enzymatic and acid digestion. J Chromatogr A 2011; 1218:1260-5. [DOI: 10.1016/j.chroma.2010.12.112] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2010] [Revised: 12/25/2010] [Accepted: 12/30/2010] [Indexed: 10/18/2022]
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9
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Mercury as undesirable substance in animal feed - Scientific opinion of the Panel on Contaminants in the Food Chain. EFSA J 2008. [DOI: 10.2903/j.efsa.2008.654] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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10
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Metal scavenging and cycling in a tropical coastal region. ACTA ACUST UNITED AC 2005. [DOI: 10.1007/bfb0010912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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11
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Bloom NS, Grout AK, Prestbo EM. Development and complete validation of a method for the determination of dimethyl mercury in air and other media. Anal Chim Acta 2005; 546:92-101. [DOI: 10.1016/j.aca.2005.04.087] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2004] [Revised: 04/22/2005] [Accepted: 04/29/2005] [Indexed: 11/16/2022]
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12
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Paraquetti HHM, Ayres GA, Dominguez de Almeida M, Molisani MM, de Lacerda LD. Mercury distribution, speciation and flux in the Sepetiba Bay tributaries, SE Brazil. WATER RESEARCH 2004; 38:1439-1448. [PMID: 15016520 DOI: 10.1016/j.watres.2003.11.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2002] [Revised: 10/20/2003] [Accepted: 11/27/2003] [Indexed: 05/24/2023]
Abstract
Dissolved gaseous Hg, reactive Hg, total dissolved Hg and particulate Hg concentrations were measured in samples of majors tributaries of the Sepetiba Bay, SE Brazil (Itimirim, Itinguçu, Guarda, Guandu, São Francisco and Ita rivers), in dry and rainy seasons. The average Hg concentrations found varied from 0.02 to 0.18 ng L(-1) for dissolved gaseous Hg, from 0.1 to 18.1 ng L(-1) for reactive Hg, from 0.1 to 66.6 ng L(-1) for total dissolved Hg and from 0.3 to 250 ng L(-1) for particulate Hg. During the rainy season, a decrease in the dissolved Hg concentrations and an increase in the particulate Hg concentrations was observed. Positive correlations were found between the reactive Hg and the total dissolved Hg concentrations (r = 0.99), between the particulate Hg and TSS concentrations (r = 0.82) and between total Hg and particulate Hg concentrations (r = 0.95). The instantaneous Hg fluxes varied among rivers from 0.02 to 412 microgs(-1) for total dissolved Hg and from 0.03 to 12,572 microgs(-1) for particulate Hg. The log Kd varied from 3.76 to 6.43 and showed a significant increase in rainy season following an increase in particulate Hg and a decrease in dissolved Hg concentrations. These results suggest that erosion and runoff are the major pathways of Hg transport to rivers and eventually to Sepetiba Bay.
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Affiliation(s)
- Heloisa Helena M Paraquetti
- Departamento de Geoquímica, Universidade Federal Fluminense, Campus do Valonguinho, Niterói, RJ 24020-007, Brazil
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Yang L, Colombini V, Maxwell P, Mester Z, Sturgeon RE. Application of isotope dilution to the determination of methylmercury in fish tissue by solid-phase microextraction gas chromatography–mass spectrometry. J Chromatogr A 2003; 1011:135-42. [PMID: 14518770 DOI: 10.1016/s0021-9673(03)01122-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Species-specific isotope dilution (ID) calibration using solid-phase microextraction (SPME) in combination with gas chromatography-mass spectrometry (GC-MS) for separation and detection of methylmercury (MeHg) in fish tissue is described. Samples were digested with methanolic potassium hydroxide. Analytes were propylated and headspace sampled with a polydimethylsiloxane-coated SPME fused-silica fiber. ID analysis was performed using a laboratory-synthesized 198Hg-enriched methylmercury (Me 198Hg) spike. Using selective ion monitoring (SIM) mode, the intensities of Me 202HgPr+ at m/z 260 and Me 198HgPr+ at m/z 256 were used to calculate the m/z ratio at 260/256, which was used to quantify MeHg in NRCC CRM DORM-2 fish tissue. A MeHg concentration of 4.336 +/- 0.091 microg g(-1) (one standard deviation, n = 4) as Hg was obtained in DORM-2, in good agreement with the certified value of 4.47 +/- 0.32 microg g(-1) (95% confidence interval). A concentration of 4.58 +/- 0.31 microg g(-1) was determined by standard additions calibration using ethylmercury (EtHg) as an internal standard. The three-fold improvement in the precision of measured MeHg concentrations using ID highlights its superiority in providing more precise results compared to the method of standard additions. A method detection limit (3 S.D.) of 0.037 microg g(-1) was estimated based on a 0.25 g subsample of DORM-2.
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Affiliation(s)
- Lu Yang
- Institute for National Measurement Standards, National Research Council Canada, Ottawa, Ontario, K1A 0R6 Canada.
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14
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Sanz J, de Diego A, Raposo J, Madariaga J. Routine analysis of mercury species using commercially available instrumentation: chemometric optimisation of the instrumental variables. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00514-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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15
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Gómez-Riza JL, Morales E, Giráldez I, Sánchez-Rodas D, Velasco A. Sample treatment in chromatography-based speciation of organometallic pollutants. J Chromatogr A 2001; 938:211-24. [PMID: 11771840 DOI: 10.1016/s0021-9673(01)01103-7] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Speciation analysis is nowadays performed routinely in many laboratories to control the quality of the environment, food and health. Chemical speciation analyses generally include the study of different oxidation state of elements or individual organometallic compounds. The determination of the different chemical forms of elements is still an analytical challenge, since they are often unstable and concentrations in different matrices of interest are in the microg l(-1) or even in the ng l(-1) range (e.g., estuarine waters) or ng g(-1) in sediments and biological tissues. For this reason, sensitive and selective analytical atomic techniques are being used as available detectors for speciation, generally coupled with chromatography for the time-resolved introduction of analytes into the atomic spectrometer. The complexity of these instrumental couplings has a straightforward consequence on the duration of the analysis, but sample preparation to separate and transfer the chemical species present in the sample into a solution to be accepted readily by a chromatographic column is the more critical step of total analysis, and demands considerable operator skills and time cost. Traditionally, liquid-liquid extraction has been employed for sample treatment with serious disadvantages, such as consumption, disposal and long-term exposure to organic solvent. In addition, they are usually cumbersome and time-consuming. Therefore, the introduction of new reagents such as sodium tetraethylborate for the simultaneous derivatization of several elements has been proposed. Other possibilities are based in the implementation of techniques for efficient and accelerated isolation of species from the sample matrix. This is the case for microwave-assisted extraction, solid-phase extraction and microextraction, supercritical fluid extraction or pressurized liquid extraction, which offer new possibilities in species treatment, and the advantages of a drastic reduction of the extraction time and the embodiment into on-line flow analysis systems. This new generation of treatment techniques constitutes a good choice as fast extraction methods for feasible species-selective analysis of organometallic compounds under the picogram level, that can be used for national regulatory agencies, governmental and industrial quality control laboratories, and consequently, for manufacturers of analytical instrumentation.
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Affiliation(s)
- J L Gómez-Riza
- Departamento de Química y Ciencia de los Materiales, Escuela Politécnica Superior, Universidad de Huelva, Palos de la Frontera, Spain.
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Tseng CM, Amouroux D, Abril G, Tessier E, Etcheber H, Donard OF. Speciation of mercury in a fluid mud profile of a highly turbid macrotidal estuary (Gironde, France). ENVIRONMENTAL SCIENCE & TECHNOLOGY 2001; 35:2627-2633. [PMID: 11452584 DOI: 10.1021/es001750b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Mercury (Hg) speciation and partitioning have been investigated in a fluid mud profile collected in the high turbidity zone of the Gironde estuary. The formation of the fluid lens generates local and transient oxic-anoxic oscillations following the sedimentation-resuspension tidal cycles under a specific hydrodynamic regime. The total Hg concentration, ranging from 5 to 190 nM, increases with SPM concentration (4-174 g L-1) to a maximum at bottom. Particulate Hg averages 99% of total Hg. Particulate inorganic Hg (IHg(II)P) and monomethyl Hg (MMHgP) exhibit a similar trend: the maximum concentration is observed within the upper layer above the depth of 7 m and the minimum at the bottom layers of the fluid mud. Significant levels of "dissolved" (i.e. filter passing) Hg species (IHg(II)D, HgoD, MMHgD, DMHgD) are observed within the redox transition interface. In the sub/anoxic fluid mud layer, increasing concentrations of IHg(II)D and MMHgD coincide with decreasing concentrations of IHg(II)P and MMHgP, respectively. The distribution coefficient (log Kd) between the "dissolved" and particulate fraction for IHg(II) averages 4.5 +/- 0.2. A Kd minimum for IHg(II) is observed in the surface layer and at the bottom of the fluid mud and coincides with the maximum levels of dissolved Mn and Fe. Log Kd for MMHg averages 3.3 +/- 0.9 and presents the highest values (4.3-4.6) in the surface and the lowest (approximately 2.2) at bottom, corresponding to the particulate carbon profile. These results demonstrate that the fate of IHg(II) and MMHg in the fluid mud system is influenced by the redox cycling of major species such as carbon, Fe, and Mn. It is therefore suggested that the redox oscillations generated by fluid mud formation in the high turbidity zone affect the distribution and transfer of Hg species in macrotidal estuaries.
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Affiliation(s)
- C M Tseng
- Laboratoire de Chimie Analytique Bio Inorganique et Environnement, UMR CNRS 5034, Université de Pau et des Pays de l'Adour, 64053 Pau, France.
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17
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de Diego A, Tseng CM, Dimov N, Amouroux D, Donard OFX. Adsorption of aqueous inorganic mercury and methylmercury on suspended kaolin: influence of sodium chloride, fulvic acid and particle content. Appl Organomet Chem 2001. [DOI: 10.1002/aoc.185] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Hu G, Wang X. Ultrasound-Assisted Thiourea Leaching of Methylmercury from Sediments for Gas Chromatography/Ion Trap Mass Spectrometric Analysis. ANAL LETT 1998. [DOI: 10.1080/00032719808002878] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Barrocas PRG, Wasserman JC. Mercury behaviour in sediments from a sub-tropical coastal environment in SE Brazil. ENVIRONMENTAL GEOCHEMISTRY IN THE TROPICS 1998. [DOI: 10.1007/bfb0010913] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Martin F, Corrigan FM, Donard OF, Kelly J, Besson JA, Horrobin DF. Organotin compounds in trimethyltin-treated rats and in human brain in Alzheimer's disease. Hum Exp Toxicol 1997; 16:512-5. [PMID: 9306138 DOI: 10.1177/096032719701600906] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
As blood tin concentrations are elevated in Alzheimer's disease and as some low molecular weight organotin compounds are neurotoxic, we have attempted to detect organotins in brain in Alzheimer's Disease. First we measured the concentration of trimethyltin (TMT) in the brains of rats which had been exposed to memory-impairing concentrations of TMT and, as the method of linking hydride generation, cryogenic trapping, gas chromotographic separation and atomic absorption spectrophotometric detection permitted the measurements of organotin compounds when the total tin was greater than 0.2 nanograms, we applied these techniques to human brain tissue, some of which showed neuropathological evidence of Alzheimer's Disease. No low molecular weight organotin compounds were detected in the human brain tissue, but it is possible that tin may be complexed with large organic molecules, the hydrides of which would not be volatile, but which could be identified by liquid chromatography.
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Affiliation(s)
- F Martin
- Laboratoire de Photophysique et Photochimie Moleculaire, Universite de Bordeax, France
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Puk R, Weber JH. Critical review of analytical methods for determination of inorganic mercury and methylmercury compounds. Appl Organomet Chem 1994. [DOI: 10.1002/aoc.590080404] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Puk R, Weber JH. Determination of mercury(II), monomethylmercury cation, dimethylmercury and diethylmercury by hydride generation, cryogenic trapping and atomic absorption spectrometric detection. Anal Chim Acta 1994. [DOI: 10.1016/0003-2670(94)00066-2] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Horvat M, Liang L, Bloom NS. Comparison of distillation with other current isolation methods for the determination of methyl mercury compounds in low level environmental samples. Anal Chim Acta 1993. [DOI: 10.1016/0003-2670(93)80364-q] [Citation(s) in RCA: 335] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Gardiner PE. Considerations in the preparation of biological and environmental reference materials for use in the study of the chemical speciation of trace elements. ACTA ACUST UNITED AC 1993. [DOI: 10.1007/bf00322612] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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