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首页> 外文期刊>Environmental Science and Pollution Research >Contamination assessment, health risk evaluation, and source identification of heavy metals in the soil-rice system of typical agricultural regions on the southeast coast of China
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Contamination assessment, health risk evaluation, and source identification of heavy metals in the soil-rice system of typical agricultural regions on the southeast coast of China

机译：中国东南海岸典型农业区土壤水稻体系中重金属的污染评估，健康风险评估。

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摘要

To quantitatively assess heavy metal accumulation and potential ecological and human health risks as well as analyze the sources of metals in a typical soil-rice system located on the southeast coast of China, 120 topsoil samples and corresponding rice grain samples were collected across the study area. The concentrations of As, Cd, Pb, Cr, Hg, Zn, Cu, and Ni were analyzed. The results revealed that Hg, Cd, and Cu were the main pollutants in soils. Besides, according to geo-accumulation value of Hg, 18.3% of samples were at or above moderate contamination levels. Additionally, the soil was in moderate ecological risk from combined heavy metal pollution, and 49.7% and 27.0% of this risk could be attributed to Hg and Cd pollution, respectively, due to their high toxic-response factors. For the rice samples, Cd content showed the highest biological accumulation coefficient value (40.8%) in rice grains and was slightly greater than its maximum allowable value (MAV) (0.2 mg/kg) in 7.5% of samples, whereas the other metals were all lower than their corresponding MAVs. Heavy metal exposure (especially As exposure) via rice consumption causes significant carcinogenic and non-carcinogenic risks to adults, and non-carcinogenic risk to children, while the carcinogenic risk to children was at tolerable level. Greater rice consumption might be responsible for the greater health risk to adults than children. Natural sources (loaded heavily with Cr and Ni) such as lithogenic components and soil parent materials, agricultural activities (loaded heavily with Cd, Cu, and Zn), especially excessive use of pesticides and fertilizers, and industrial activities (loaded heavily with Hg, Pb, and As) including vehicle emissions, coal combustion, and those of the textile and chemical industries were identified as the main sources. Effective regulations should be enforced to guarantee the safety of farm produce and protect ecological and human health in the study area.
机译：为了定量评估中国东南沿海典型土壤-水稻系统中重金属的积累和潜在的生态和人类健康风险，并分析重金属的来源，在研究区域内采集了120个表层土样品和相应的稻谷样品。分析了砷、镉、铅、铬、汞、锌、铜和镍的浓度。结果表明，汞、镉和铜是土壤中的主要污染物。此外，根据汞的地质累积值，18.3%的样品处于或高于中度污染水平。此外，土壤处于中度的重金属复合污染生态风险中，由于汞和镉的高毒性反应因子，汞和镉污染分别占该风险的49.7%和27.0%。对于水稻样品，Cd含量在水稻籽粒中显示出最高的生物累积系数值（40.8%），在7.5%的样品中略高于其最大允许值（MAV）（0.2 mg/kg），而其他金属均低于其相应的MAV。通过食用大米接触重金属（尤其是作为接触）会对成年人造成重大致癌和非致癌风险，对儿童造成非致癌风险，而对儿童的致癌风险处于可容忍水平。大米消费量的增加可能比儿童对成年人的健康风险更大。天然来源（富含Cr和Ni），如成岩成分和土壤母质，农业活动（富含Cd、Cu和Zn），尤其是农药和肥料的过度使用，以及工业活动（富含Hg、Pb和as），包括车辆排放、煤炭燃烧，而纺织和化学工业被确定为主要来源。应实施有效的法规，以确保研究区域的农产品安全，保护生态和人类健康。

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