The influence and health risk assessment of groundwater quality in irrigated area
XU Li-wen1,2, BIAN Jian-min1,2, SUN Xiao-qing1,2, LOU Yu-qi1,2, SUN Guo-jing1,2
1. College of New Energy and Environment Institute, Jilin University, Changchun 130021, China; 2. Key Laboratory of Groundwater Resources and Environment Ministry of Education, Jilin University, Changchun 130021, China
Abstract：In order to explore the influence of drainage in irrigated areas on regional groundwater quality and health risks, the groundwater monitoring data of different strata in the western region of Jilin from 2012 to 2014 and 2019~2020 were selected, and the random forest method was used to evaluate the groundwater quality, and the spatio-temporal variation of groundwater quality under the influence of irrigated areas was analyzed. The primary environmental background of the study area and the influence of the irrigation area were comprehensively considered, and the health risk assessment of multiple elements exceeding the standard of groundwater was integrated. The spatio-temporal variation and influencing factors of the superimposed double risks were systematically compared and analyzed. The results show that the chemical types of groundwater in the irrigated area and its surrounding areas are mainly HCO3--Na+-Ca2+ weakly alkaline water, and there is no significant change in the two periods. Groundwater exceeding the standard consists of F, Fe, Mn and "trinitrogen" compounds. Drainage in irrigated area aggravates the change of "trinitrogen" content in surrounding water. There was a 17% increase in category Ⅳ to Ⅴ water in shallow groundwater, and a 12% increase in the number of monitoring sites with health risks exceeding the safety threshold. The health risks of groundwater are caused by the superposition of NO3-, NO2-, NH4+ in the retreated water of irrigated area and the health risks caused by F and Mn in the native environment. NO3-, NO2- and NH4+ are the main control factors of health risk in shallow groundwater. Confined water is insensitive to the disturbance of water retreat in irrigated area.
许力文, 卞建民, 孙晓庆, 楼雨奇, 孙国静. 灌区退水对区域地下水质影响与健康风险评估[J]. 中国环境科学, 2023, 43(4): 1688-1695.
XU Li-wen, BIAN Jian-min, SUN Xiao-qing, LOU Yu-qi, SUN Guo-jing. The influence and health risk assessment of groundwater quality in irrigated area. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1688-1695.
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