Appraisal of shallow groundwater quality with human health risk assessment in different seasons in rural areas of the Guanzhong Plain (China).
Appraisal of shallow groundwater quality with human health risk assessment in different seasons in rural areas of the Guanzhong Plain (China).
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DOI：
10.1016/j.envres.2021.112210
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发表时间：
2021-10
影响因子：
8.3
通讯作者：
Yuanhang Wang;Peiyue Li
中科院分区：
文献类型：
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作者：
Yuanhang Wang;Peiyue Li
地下水是中国陕西省华县及其周边地区饮用水和灌溉用水的主要来源。本研究的主要目的是评价滑县地下水丰水期和枯水期的水质状况，分析季节差异的原因，确定污染严重的区域。在这项研究中，地下水质量评价熵水质指数（EWQI）和一些图形的方法，如吉布斯和派珀图。利用地理信息系统（GIS）绘制了地下水水质等值线图。结果表明，丰水期和枯水期地下水水质均为优或良的区域主要分布在研究区的北部和东部。COD和NO3−是对水质产生最严重负面影响的参数。影响研究区地下水化学演化的主导因素是岩石风化和溶解，雨季和旱季的降水和蒸发不会引起地下水化学的显着变化。成人健康风险评价结果显示，丰水期和枯水期分别有27.69%和52.31%的地下水样本超过非致癌风险可接受限值，而儿童的这一比例分别为30.16%和47.62%。丰水期硝酸盐、氟化物和硝酸盐对总风险的贡献率分别为61.29%、28.71%和10.00%，枯水期分别为68.84%、20.85%和10.31%。研究区南部的风险高于北部，尤其是研究区西南部。
Groundwater is the major source of water for drinking and irrigation purposes in and around Hua County, Shaanxi Province, China. The main purposes of this research is to evaluate the groundwater quality in the rainy and dry seasons of Hua County and analyze the causes of seasonal differences and determine the areas with serious pollution. Groundwater quality was assessed in this study using entropy water quality index (EWQI) and some graphical approaches such as Gibbs and Piper diagrams. The contour maps of groundwater quality were drawn by Geographical Information System (GIS). According to the obtained results, the locations where groundwater quality was rated as excellent or good in both wet and dry seasons were mainly in the north and east of the research area. COD and NO3−are the parameters that have the most serious negative effect on water quality. The dominant factors influencing groundwater chemical evolution in the study area were rock weathering and dissolution, and the precipitation and evaporation during the wet and dry seasons do not cause significant changes in groundwater chemistry. Adults' health risks results revealed that 27.69% and 52.31% of the groundwater samples exceeded the acceptable limit for non-carcinogenic risk in the wet and dry season, respectively, while for children the ratios are 30.16% and 47.62%, respectively. The contributive percentages of nitrate, fluoride and nitrate to the total risk are 61.29%, 28.71% and 10.00% in the wet season and 68.84%, 20.85% and 10.31% in the dry season. The risk is higher in the south than in the north of the study area, and is especially high in the southwest of the study area.