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Abstract：
Agricultural soils were collected from Mocorito river basin, to determine potentially toxic elements (PTEs) subtotal concentrations and geochemical fractionation, and evaluate their environmental and health risks. All sites showed low As and Cr concentrations. Subtotal concentrations (mg/kg) ranged between 6.8 and 25.6 for As, 1.9 and 2.5 for Cd and 22.5 and 55.1 for Cr. These values were classified as moderately contaminated for As, while a considerable contamination was presented for Cd and Cr. Geochemical partitioning revealed that PTEs are strongly linked with residual phase. Arsenic was associated with amorphous Fe-oxyhydroxides. Ecotoxicological indices showed from low (As and Cr) to considerable (Cd) potential ecological risk factors; potential non-carcinogenic risks by As, Cd and Cr, and potential carcinogenic risks by As and Cr. Lithogenic and anthropogenic sources were identified. Arsenic and Cr showed lithogenic influence, while Cd increased, caused by nearby activities, representing an environmental and health risk.
摘要：
农业土壤是从莫科里托河流域收集的，为了确定潜在有毒元素(PTEs)的小计浓度和地球化学分馏，并评估其环境和健康风险。所有位点均显示出低As和Cr浓度。As的小计浓度（mg/kg）介于6.8和25.6之间，Cd为1.9和2.5，Cr为22.5和55.1。这些值被归类为中度污染的As，而Cd和Cr存在相当大的污染。地球化学分配表明，PTE与残留相密切相关。砷与无定形氢氧化Fe有关。生态毒理学指数显示从低（As和Cr）到相当大（Cd）的潜在生态风险因素；As的潜在非致癌风险，Cd和Cr,以及As和Cr的潜在致癌风险。确定了岩性和人为来源。砷和铬具有成岩作用，当Cd增加时，由于附近的活动，代表环境和健康风险。
