Groundwater health risk assessment based on spatial analysis in the Qiaomaidi watershed
ZHANG Yong1,2, GUO Chun-qing2, SUN Ping-an1, ZHU Yan-guang2, YU Shi1
1. Key Laboratory of Karst Dynamics, Ministry of Land and Resource, Guangxi Zhuang Autonomous Region, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China; 2. Guilin University of Technology, School of Environmental Science and Engineering, Guilin 541000, China
Abstract:Concentration of five metals, Cr, Pb, Co, Mn, Hg and one inorganic toxicological index, fluoride from twenty-four samples collected from groundwater in the Qiaomaidi watershed were measured and analyzed. Based on the semi-variance model and other geostatistical methods, the distribution characteristics of the groundwater health risk assessment were analyzed. The health risks of adults and children through drinking pathway were 9.27×10-10~4.59×10-5a-1 and 1.10×10-8~5.46×10-4a-1, respectively. The groundwater health risks were dominant by Cr, and were consistent for adults and children. The distribution of the health risks was spatial regularity, and presented as a strip from south to north. Influenced by the Yaoshan town located in the middle of the watershed, the health risks increased remarkably in the south which was the downstream.
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