皖江经济带耕地重金属健康风险评价及环境基准

以皖江经济带耕地为研究区对象，采集了水稻和小麦及其根系土样品338组，测定了5种重金属含量(As、 Cd、 Cr、 Hg和Pb),采用地累积指数法和综合污染指数法评价了土壤-农作物污染特征，进行摄入农作物重金属对人体健康风险进行评估，并基于物种敏感分布模型(SSD)反演了区域耕地土壤环境基准值.结果表明，研究区水稻和小麦土壤受到不同程度重金属(As、 Cd、 Cr、 Hg和Pb)污染，其中Cd为水稻首要污染因子，超标率在13.33%,Cr为小麦的主要超标因子，超标率达11.32%;地累积指数显示水稻Cd污染比例达80.7%,小麦Cd污染率为35.85%.与土壤重金属高污染水平相反，仅有17.19%和7.55%的水稻和小麦中Cd超过国家食品安全限量标准，重金属Cd的累积能力为水稻>小麦.健康风险评价表明重金属对研究区成人和儿童具有较高的非致癌风险和不可接受的致癌风险，水稻摄入的致癌风险高于小麦，儿童的健康风险均高于成人.SSD反演得出研究区水稻田土壤的As、 Cd、 Cr、 Hg和Pb基准值HC₅为6.24、 0.13、 258.27、 0.12和53.61m...

Health Risk Assessment and Environmental Benchmark of Heavy Metals in Cultivated Land in Wanjiang Economic Zone

Focusing on the cultivated land in Wanjiang Economic Zone, 338 sets of soil samples of rice, wheat, and their roots were collected; the concentrations of five heavy metals (As, Cd, Cr, Hg, and Pb) were determined; the soil-crop pollution characteristics were evaluated using the method of geo-accumulation index and comprehensive evaluation; the human health risk of ingesting heavy metals from crops was assessed; and the soil environmental reference value of the regional cultivated land was inverted based on the species sensitive distribution model (SSD). The results showed that in the study area, the soil of rice and wheat was polluted by heavy metals (As, Cd, Cr, Hg, and Pb) in varying degrees, among which Cd was the primary pollution factor of rice, with the over-standard rate of 13.33%, and Cr was the main over-standard factor of wheat, with the over-standard rate of 11.32%. The cumulative index showed that the percentage of Cd pollution in rice was 80.7%, and that in wheat was 35.85%. Contrary to the high pollution level of soil heavy metals, only 17.19% and 7.55% of Cd in rice and wheat exceeded the national food safety limit, and the accumulation capacity of the heavy metal Cd was rice>wheat. The health risk assessment indicated that heavy metals had high non-carcinogenic risk and unacceptable carcinogenic risk to adults and children in this study. The carcinogenic risk of rice intake was higher than that of wheat, and the health risk of children was higher than that of adults. SSD inversion showed that the reference values of As, Cd, Cr, Hg, and Pb in paddy soil in the study area were an HC₅ of 6.24, 0.13, 258.27, 0.12, and 53.61 mg·kg^-1 and an HC₉₅ of 68.81, 5.71, 1068.92, 0.80, and 174.22 mg·kg^-1, respectively. The reference values of As, Cd, Cr, Hg, and Pb in wheat soil HC₅ were 32.99, 0.04, 271.14, 0.09, and 47.53 mg·kg^-1, and the values of HC₉₅ were 225.28, 0.71, 998.58, 1.43, and 241.99 mg·kg^-1, respectively. The reverse analysis showed that the HC₅ of heavy metals in rice and wheat were lower than the soil risk screening values in the current standard to varying degrees. The current soil standard had loosened for the evaluation results of this region.