期刊
JOURNAL OF ASIAN EARTH SCIENCES
卷 163, 期 -, 页码 70-79出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jseaes.2018.05.018
关键词
Groundwater As enrichment; delta C-13; Dissolved inorganic carbon; Dissolved organic carbon; Biogeochemistry processes; Aquifers
资金
- National Natural Science Foundation of China [41672225, 41222020]
- Fundamental Research Funds for the Central Universities [2652013028]
- Fok Ying-Tung Education Foundation, China [131017]
- China Scholarship Council
Organic matter is believed to trigger the formation of high As groundwater, which has been widely found in China. Sixty-three groundwater samples, seven multilevel-well groundwater samples and four surface water samples were collected to trace and delineate groundwater organic matter by using stable carbon isotopes of dissolved organic carbon, dissolved inorganic carbon, and sedimentary organic carbon in this study. Low delta C-13(DIC) mainly occurred in high As groundwater in the flat plain area. High As concentrations corresponding to high delta C-13(DOC) values indicated that As was released during microbial degradation of DOC coupled with reduction of Fe oxides. Along the flow path, delta(13)(DIC), ORP values and SO4/Cl ratios showed decreasing trends with the increases in As and dissolved Fe concentrations, illustrating a gradual increase in anaerobic microbial activities that caused reductive dissolution of Fe oxides and As enrichment. Results of groundwater samples from a multi-level well showed that small Delta delta (defined as the difference between delta C-13(DOC) and delta(13)(DIC)) indicated that more sufficient DOC degradation contributed to groundwater DIC concentrations and facilitated groundwater As mobilization.
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