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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

文献类型： 外文期刊

作者： Ren, Yanjun 1 ; Lin, Meng 2 ; Liu, Qingming 1 ; Zhang, Zhonghao 4 ; Fei, Xufeng 5 ; Xiao, Rui 2 ; Lv, Xiaonan 5 ;

作者机构： 1.Hangzhou Ctr Dis Control & Prevent, Hangzhou, Peoples R China

2.Wuhan Univ, Sch Remote Sensing & Informat Engn, Wuhan, Peoples R China

3.Qingdao Urban Planning & Design Res Inst, Qiangdao, Peoples R China

4.Shanghai Normal Univ, Inst Urban Studies, Sch Environm & Geog Sci, Shanghai, Peoples R China

5.Zhejiang Acad Agr Sci, 198 Shiqiao Rd, Hangzhou 310021, Zhejiang, Peoples R China

6.Minstry Agr & Rural Affairs, Key Lab Informat Traceabil Agr Prod, Hangzhou, Peoples R China

关键词： Heavy metal; Rice grain; Pollution assessment; Ecological risk; Health risk; Source identification

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期：

页码：

收录情况： SCI

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.

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