Groundwater transport of arsenic and chromium at a historical tannery,Woburn, Massachusetts,U.S.A. |
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| Institution: | 1. Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL, USA;2. Department of Chemical Engineering and Materials Science, Yuan Ze University, Taoyuan City, 32003, Taiwan, ROC;1. Laboratório de Ciências Ambientais (LCA), Centro de Biociências e Biotecnologia (CBB), Universidade Estadual do Norte Fluminense ‘‘Darcy Ribeiro (UENF), Av. Alberto Lamego, 2000, Parque Califórnia, Campos dos Goytacazes, CEP:28013-602 Rio de Janeiro, RJ, Brasil;2. Centro de Estudos da Saúde do Trabalhador e Ecologia Humana (CESTEH), ENSP, FIOCRUZ, Rua Leopoldo Bulhões, 1480, 21041-210 Rio de Janeiro, RJ, Brasil;1. US Geological Survey, Placer Hall, 6000 J St., Sacramento, CA 95819, United States;2. US Geological Survey, 4165 Spruance Rd., San Diego, CA 92101, United States;3. CHMM, MCIWEST-MCB CPEN, Box 555008 (Bldg 22165), MCB Camp Pendleton, CA 92055-5008, United States;4. US Geological Survey, 400 Natural Bridges Dr., Santa Cruz, CA 95060, United States;5. US Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025, United States;1. Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment of Ministry of Education, Chongqing University, Chongqing 400044, PR China;2. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China;3. BERIS Engineering and Research Cooperation, Baotou, Inner Mongolia, 014010, PR China;4. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China |
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| Abstract: | The geochemical environment in hide piles at a historical tanning and rendering site (Woburn, Massachusetts, U.S.A.) is strongly reducing, as reflected by the presence of H2S and CH3HS in the pile offgas. The presence of a reducing environment in the Subjacent groundwater, along with DOC (≥ 100mg/l) from hide breakdown, results in reduction of As(V) to As(III), and subsequent methylation to monomethylarsonic acid (MMAA) and dimethylarsinic acid (DMAA). The reducing conditions also result in precipitation of FeS(am), while hydrophilic organic acids have increased Cr(III) solubility. Three spatially sequential geochemical redox facies were recognized in groundwater downgradient from the hide piles. Typically, a reduced core zone was present adjacent to the hide piles, characterized by S2− ≥ 1mg/l, Fe2+ <5mg/l,NH3 ≥ 200mg/l and the presence of MMAA in conjunction with DOC (−30mg/l). This facies transitions through an intermediate zone, represented by Fe2+ > 20mg/l, NH3 (5–200 mg/l) and the sporadic presence of measurable S2− (1–2 mg/l), to an oxidizing peripheral zone characterized by conditions representative of background (i.e. DO> 1mg/l, Eh> 0mV, Fe2+ < 20mg/l, S2− < 1mg/l,NH3 < 5mg/l and NO3− >NH3), accompanied by precipitation of amorphous ferric hydroxide, sorption of As and co-precipitation-sorption of Cu, Pb and Zn. Electron microprobe analysis of hide-pile materials demonstrated authigenic precipitation of amorphous ferric hydroxide and gypsum, in agreement with the results of geochemical modeling. |
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