Profiles and potential health risks of heavy metals in soil and crops from the watershed of Xi River in Northeast China
Profiles and potential health risks of heavy metals in soil and crops from the watershed of Xi River in Northeast China
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DOI：
10.1016/j.ecoenv.2018.11.046
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发表时间：
2019-03-01
影响因子：
6.8
通讯作者：
Zeng, Xiangfeng
中科院分区：
文献类型：
--
作者：
Lian, Meihua;Wang, Jun;Zeng, Xiangfeng
土壤重金属污染是我国的一个重大环境问题，近年来引起了公众的广泛关注。本研究通过土壤暴露和膳食摄入评价了辽宁省沈阳市西河流域4种重金属（镉、铅、汞和锌）的人体健康风险。测定了该地区411个土壤样品和59个农作物样品中Cd、Pb、Hg和Zn的含量。通过土壤摄入、吸入、皮肤接触和食物摄入的重金属暴露的健康风险进一步估算，成年男性、成年女性和儿童的总危害指数分别为1.15、1.33和2.03，当地居民的总癌症风险为3.7 × 10（-3）。在所调查的4种重金属中，Cd是对人体健康危害最大的污染物。所研究的重金属所造成的非致癌和致癌风险估计高于美国环保署建议的可接受水平。受污染作物的膳食摄入被认为是该地区人类重金属暴露的主要途径，这表明土壤重金属在运输到食物链时会造成更大的危害。总体而言，我们的研究结果表明，溪河流域是不适合种植农产品，更有效的控制，以遏制该地区未来的重金属污染。
Heavy metal soil contamination is a major environmental concern in China and has drawn significant public attention in recent years. The present study assessed the human health risk of four heavy metals (cadmium, lead, mercury, and zinc) through soil exposure and dietary intake in the watershed of Xi River, west of Shenyang, Liaoning Province, northeast China. Concentrations of Cd, Pb, Hg, and Zn were determined in 411 soil samples and 59 crop samples collected from this area. The health risks of heavy metal exposure via soil ingestion, inhalation, dermal contact, and dietary intake of crops were further estimated; total hazard index values were 1.15, 1.33, and 2.03 for the adult male, adult female, and children, respectively, and the total cancer risk was 3.7 x 10(-3) for the local residents. Among the four investigated heavy metals, Cd was the primary pollutant posing health risks. The estimated non-carcinogenic and carcinogenic risks posed by the studied heavy metals were above the acceptable levels proposed by the U.S. EPA. Dietary intake of contaminated crops was identified as the predominant pathway for human heavy metal exposure in this area, suggesting that soil heavy metals can cause more harm when transported to the food chain. Overall, our findings suggest that the Xi River watershed is unsuitable for growing agricultural products, and more effective controls should be taken to curb future heavy metal pollution in the area.