Key Laboratory of Western China's Environmental Systems (Ministry of Education) and Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
Key Laboratory of Western China's Environmental Systems (Ministry of Education) and Gansu Key Laboratory for Environmental Pollution Prediction and Control, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
Sci Total Environ. 2019 Dec 20;697:134126. doi: 10.1016/j.scitotenv.2019.134126. Epub 2019 Aug 30.
Heavy metals in agricultural soil receive much attention because they are easily absorbed by crop into the ecosystem. Managing the discharge of heavy metals from the source is an effective way to prevent and control heavy metals pollution. Grouped principal component analysis (GPCA) and Positive Matrix Factorization (PMF) receptor models were utilized in this study to conduct source apportionment, and the former was optimal because of the accuracy of predicting. Based on the source contribution by GPCA/APCS, heavy metals were evaluated by fuzzy synthetic evaluation model and health risk assessment model. The results of source apportionment showed that heavy metals in Zhangye agricultural soil were mainly affected by steel industry, traffic, agrochemicals, manures, mining activities, leather industry and metal processing industry source. Fuzzy synthetic evaluation showed that the pollution levels of Chromium (Cr) derived by leather industry and metal processing industry and Nickel (Ni) derived by steel industry and traffic source were higher. Health risk assessment revealed that the non-carcinogenic and carcinogenic risks of Cr derived by leather industry and metal processing industry and Lead (Pb) derived by steel industry and traffic source were higher.
农业土壤中的重金属受到广泛关注，因为它们很容易被作物吸收到生态系统中。从源头管理重金属的排放是预防和控制重金属污染的有效途径。本研究采用分组主成分分析（GPCA）和正矩阵因子分解（PMF）受体模型进行源解析，前者由于预测精度更高而成为最优选择。基于 GPCA/APCS 的源贡献，采用模糊综合评价模型和健康风险评估模型对重金属进行评价。源解析结果表明，张掖农业土壤中的重金属主要受钢铁工业、交通、农用化学品、肥料、采矿活动、皮革工业和金属加工业源的影响。模糊综合评价表明，皮革工业和金属加工业源的铬（Cr）和钢铁工业和交通源的镍（Ni）的污染水平较高。健康风险评估显示，皮革工业和金属加工业源的 Cr 和钢铁工业和交通源的 Pb 的非致癌和致癌风险较高。
