中国岩溶Issue(4)：377-383,7.
岩溶地下河中砷迁移过程及其影响因素分析--以广西南丹县里湖地下河为例
Transport process of arsenic in karst subterranean stream and analysis on the influence factors:A case in Lihu subterranean stream of Nandan county,Guangxi
摘要
Abstract
The arsenic pollutants generated by the arsenic industries and mining enterprises in karst area flow into subterranean streams and contaminate groundwater easily because of the unique hydrogeological charac-teristics of karst area,which is a serious threat to the water ecologic security and local residents’health.In order to elucidate the geochemistry reaction mechanisms of arsenic in karst subterranean streams,the Lihu subterranean stream in Nandan county,Guangxi Province,Southwest China,is selected for the study.The main outcropped lithology in the Lihu subterranean stream catchment is Carboniferous-Triassic limestone and the karstification rate is 31.67 %.Arsenic species,sediment physical-chemical properties and hydro-chemical characteristics of the water are analyzed by inductively coupled plasma mass spectrometer (ICP-MS),X-ray fluorescence spectrometer (XRF)and plasma spectrometer (ICP)respectively.The results show that arsenic concentration in the Lihu subterranean stream is high and it is closely related to human activities.The con-tent of As (III),higher than As (V),occupies 53 % of the total inorganic arsenic in the Lihu subterranean stream due to the low redox environment,which increase the arsenic ecological risk in this region.The con-tents of total arsenic and As (III)as well as As (V)are attenuated by 5 1 %,36 %,59 % respectively in the underground river.Correlation coefficient analysis calculated with SPSS indicates that sediment Fe,sediment Ca,sediment organic matter,sediment Mn and water Ca2 + are the positive factors that promoting the deposi-tion of arsenic from water.While water Cl- ,SO 2 -4 and HCO -3 ,negatively correlated with arsenic in the wa-ter,do not facilitate to absorb arsenic.Compared with other water bodies,such as Quaternary groundwater, surface rivers and lakes waters,Ca and HCO -3 turn out to be the important factors for mobilization and transformation of arsenic due to the high calcium and bicarbonate content in karst water.Therefore,karst hydrogeological characteristics should be considered during arsenic contamination treatment in karst ground-water.关键词
地下河/砷迁移/影响因素/相关性分析/广西南丹县Key words
subterranean stream/transport process of arsenic/influence factors/correlation analysis/Nan-dan county,Guangxi分类
天文与地球科学引用本文复制引用
张连凯,杨慧..岩溶地下河中砷迁移过程及其影响因素分析--以广西南丹县里湖地下河为例[J].中国岩溶,2013,(4):377-383,7.基金项目
中国地质科学院岩溶地质研究所基本科研业务费项目(No.2012012和 No.2012005)、广西自然科学基金资助项目(No.2013GXNSFBA019217和 No.2013GXNSFBA019218)、中国地质调查局地质调查项目(No.12120113005200和 No.12120113052500) （No.2012012和 No.2012005）
