Institute of Resources and Environment Science, Xinjiang University, Urumqi, 830046, China.
Department of Geography and Spatial Information Technology, Ningbo University, NO.1188 North ring Road, Ningbo, 315211, China.
Sci Rep. 2021 Jan 22;11(1):2064. doi: 10.1038/s41598-021-81764-w.
This study investigated contamination status of eight trace elements (As, Cd, Cr, Hg, Pb, Cu, Zn and Ni) in farmland soils and crops at 535 sites across the Xinjiang Uygur Autonomous Region, Northwest China. Land use types of the sampling sites included vegetable patch, grain field and orchard. Our experimental results indicated all farmland soils were considered as trace element contamination based on the Nemerow comprehensive pollution index (NCPI > 1). However, 91.97% of the crop samples were uncontaminated according to the Chinese Risk Control Standard. Soils from the vegetable patch showed higher pollution level comparison with that from grain field and orchard. Health risks for both non-carcinogenic and carcinogenic risks were calculated through crop ingestion exposure pathway. Grain samples showed highest health risks, followed by melon and fruit, and vegetables. The health risks of crops were mainly driven by Cr and Cd. Crop consumption may pose risks for children but not adults. The source of trace element contamination in the different farmland soils varied and may be attributed to the different agricultural activities. Plant type had a greater influence on the trace element accumulation in crops compared with soil trace element contents and physicochemical properties.
本研究调查了中国西北地区新疆维吾尔自治区 535 个地点农田土壤和作物中 8 种微量元素（砷、镉、铬、汞、铅、铜、锌和镍）的污染状况。采样点的土地利用类型包括菜地、粮田和果园。我们的实验结果表明，根据内梅罗综合污染指数（NCPI>1），所有农田土壤都被认为受到了微量元素污染。然而，根据中国风险控制标准，91.97%的作物样本未被污染。与粮田和果园相比，菜地土壤的污染程度更高。通过作物摄入暴露途径计算了非致癌和致癌风险的健康风险。谷物样本显示出最高的健康风险，其次是瓜类和水果，然后是蔬菜。作物的健康风险主要由 Cr 和 Cd 驱动。食用作物可能对儿童构成风险，但对成年人没有风险。不同农田土壤中微量元素污染的来源不同，可能归因于不同的农业活动。与土壤微量元素含量和理化性质相比，植物类型对作物中微量元素的积累有更大的影响。
