Health risk assessment of Cr6+, As and Hg in groundwater of Jilantai salt lake basin, China
GAO Rui-zhong1,2, QIN Zi-yuan1, ZHANG sheng1,2, JIA De-bin1,2, DU Dan-dan1,2, ZHANG A-long1, WANG Xi-xi3
1. Institute of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China; 2. Inner Mongolia Key Laboratory of Water Resources Protection and Utilization, Hohhot 010010, China; 3. Old Dominion University, Norfolk 23529, USA
Abstract：Jilantai salt lake basin in the arid area of northwest China was selected as the typical study area. 71 groundwater samples were collected, and of which Cr6+, As, Hg and main chemical constituents were tested. The figures based on the geological statistics interpolation were plotted to reveal the spatial distribution characteristics of Cr6+, As and Hg in the groundwater. The conditions of pollution and health risk from Cr6+, As, Hg were assessed by the standard index method, the Nemerow index method and US EPA model. Source analysis of Cr6+, Hg, As was carried out by statistical test. The results showed that:Cr6+, As, Hg generally existed in the basin groundwater. The content of Cr6+ in upper reaches and north-eastern part of the salt lake were higher, and the content of As in the south-western platform was higher. Hg concentration appeared higher value in the northwest Mountain Bayinwula. All of these distributions and changes were affected by nature and human activities. The content of Cr6+ and As appeared excessive in the local area, and the excessive ratios were 8.45% and 2.82% separately. The main excessive areas of Cr6+ were strip-like along with Tugeligaole Valley in the south-western part. As was excessive as spotted state and distributed in the southwest and northeast part. There were no moderate and severe pollution in the study area, and the 87.3% groundwater was safe and clean. There was local mild pollution area in southwest part of the salt lake. The health risk of chemical carcinogens by the way of drinking water was much higher than that of non-chemical carcinogens. Although chemical carcinogens Cr6+ in the southwest part exceeded the maximum acceptable risk of US EPA, the average health risk of whole basin from Cr6+ was lower than that limit; the chemical carcinogen As and non-chemical carcinogen Hg were both lower than the acceptable value. The distribution of total carcinogenic risk was consistent with Cr6+s', and the contribution rate of Cr6+ was 89% for the total carcinogenic risk. The high content of Cr6+ might be due to the higher permanganate index, which made Cr3+ oxidation to Cr6+. As and Cr were homologous source.
高瑞忠, 秦子元, 张生, 贾德彬, 杜丹丹, 张阿龙, 王喜喜. 吉兰泰盐湖盆地地下水Cr6+、As、Hg健康风险评价[J]. 中国环境科学, 2018, 38(6): 2353-2362.
GAO Rui-zhong, QIN Zi-yuan, ZHANG sheng, JIA De-bin, DU Dan-dan, ZHANG A-long, WANG Xi-xi. Health risk assessment of Cr6+, As and Hg in groundwater of Jilantai salt lake basin, China. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(6): 2353-2362.
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