Characteristics of Stable Carbon Isotopes and Its Significance of Antimony Enrichment in High-antimony Groundwater of Xikuangshan Mines,Hunan
DOC(dissolved organic carbon)is a crucial factor for antimony(Sb)enrichment in groundwater.High-Sb groundwater samples were analyzed using hydrochemistry and stable carbon isotope to elaborate the effects of oxidative degradation of organic matter on Sb enrichment in groundwater of Xikuangshan Mines,Hunan.The results indicate that the value of 813CDIC and 813CDOC ranged from-17.84‰ to-2.30‰ and from-26.87‰ to-16.70‰,respectively.An obviously positive correlation between Sb and DOC,as well as HCO3-in high-Sb groundwater,indicating that Sb enrichment may be significantly contributed to microbial activities.Mean-while,DOC had lower values of δ13 C compared with dissolved inorganic carbon,suggesting DOC was mainly controlled by endogenous organic matter.Owing to the Sb concentration showed gradually increased trends with decreasing difference between 813 CDIC andδ13CDOC,the microbial degradation of DOM had a substantial contribution to Sb mobility.
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