Volume 39 Issue 5
Sep.  2020
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Yuan Xiaofang, Deng Yamin, Du Yao, Gan Yiqun. Characteristics of stable carbon isotopes and its implications on arsenic enrichment in shallow groundwater of the Jianghan Plain[J]. Bulletin of Geological Science and Technology, 2020, 39(5): 156-163. doi: 10.19509/j.cnki.dzkq.2021.0008
Citation: Yuan Xiaofang, Deng Yamin, Du Yao, Gan Yiqun. Characteristics of stable carbon isotopes and its implications on arsenic enrichment in shallow groundwater of the Jianghan Plain[J]. Bulletin of Geological Science and Technology, 2020, 39(5): 156-163. doi: 10.19509/j.cnki.dzkq.2021.0008

Characteristics of stable carbon isotopes and its implications on arsenic enrichment in shallow groundwater of the Jianghan Plain

doi: 10.19509/j.cnki.dzkq.2021.0008
  • Received Date: 06 Mar 2020
  • Dissolved organic matter of groundwater is one of the most important factors controlling arsenic release. In order to elaborate the characteristics of stable carbon isotopes and the effects of degradation of organic matter on arsenic enrichment in groundwater, shallow groundwater samples were collected using hydrochemistry and stable carbon isotope analysis in typical arsenicosis areas of the Jianghan Plain. Results indicate that the concentration of As in the shallow groundwater range in 0.23-2621 μg/L. Surface water has lower values of δ13CDOC and δ13CDIC compared with groundwater. The value of δ13CDIC ranges from -11.9‰ to 3.99‰ and the values of δ13CDOC ranges from -28.5‰ to -19.6‰ in groundwater. There is a negative correlation between δ13CDIC-δ13CDOC and As concentration. It indicates that the degradation of organic matter promotes the enrichment of As. There is a positive correlation between δ13CDIC-δ13CDOC and δ13CDIC also between δ13CDIC-δ13CDOC and DOC concentration. It indicates that the microbially involving oxidative decomposition of organic carbon in groundwater leads to the fractionation of carbon isotopes, and the degradation of dissolved organic matter is the main source of inorganic carbon in groundwater. Moreover, some groundwater samples have high δ13CDIC values in the Jianghan Plain, which is significantly higher than other typical arsenic affected areas (Hetao Plain and Datong Basin). It is suggested that methanogenic process occurred in arsenic affected aquifer of the Jianghan Plain, which results in significant carbon isotope fractionation.

     

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