钱江源国家公园水田土壤重金属污染特征、来源分析及健康风险评价
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1.中国林业科学研究院亚热带林业研究所;2.钱江源国家公园管理局

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中图分类号:

X53

基金项目:

钱江源国家公园科技项目(QZLHKH2023-2,QZLHKH2024-1) ;中国林业科学研究院亚热带林业研究所创新研究项目(RISFZ-2023-01)


Characteristics, source analysis and health risk assessment of heavy metal pollution in paddy soil in Qianjiangyuan National Park
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Qianjiangyuan National Park Science and Technology Project (QZLHKH2023-2, QZLHKH2024-1); Innovation Research Project of Subtropical Forestry Research Institute, Chinese Academy of Forestry (RISFZ-2023-01)

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    摘要:

    [目的]探究钱江源国家公园水田土壤重金属含量特征并评价其污染程度,分析重金属来源及人体的健康风险评价,为研究区域内土壤重金属污染防控和土壤保护提供参考依据。[方法]采集并测定研究区61个土壤样品中pH以及重金属镉(Cd)、铅(Pb)、汞(Hg)、铬(Cr)、砷(As)、镍(Ni)、铜(Cu)和锌(Zn)的含量,运用一系列指数法、因子分析和聚类分析等方法进行了重金属元素污染特征与生态风险评价和来源解析,同时对研究区内人体健康风险进行评估。[结果]①研究区内水田表层土壤呈酸性,土壤中Cd、Pb、Hg、Cr、As、Ni、Cu和Zn这8种重金属平均含量分别为0.19、32.74、0.13、67.06、4.43、24.90、21.51、94.60 mg/kg。与浙江省土壤背景值对比发现,重金属Hg、Cr、Ni、Cu、Zn平均含量均超过了浙江省土壤环境背景值,分别是背景值的1.32倍、1.71倍、2倍、1.19倍、1.13倍。 ②对于风险筛选值来说,虽然Cd的点位超标率达到了6.56%,Ni和Cr的点位超标率分别为3.28%和1.64%,但是以调查的水田重金属含量均值为代表,研究区域中8种重金属含量平均值均小于对应的农用地土壤风险筛选值。③通过因子分析等方法发现,土壤重金属的来源以人为因素占主导,人为与自然两者综合作用;儿童的综合致癌健康风险处于可耐受风险。[结论]钱江源国家公园水田土壤重金属污染程度较低,整体呈轻度生态风险,但存在Cr和Ni元素的污染风险;重金属元素As是影响人体健康的主要致癌因素。

    Abstract:

    [Objective] To explore the characteristics of heavy metal content in paddy soil within Qianjiangyuan National Park, evaluate its pollution level, analyze the sources of heavy metals, conduct a human health risk assessment, and provide insights for soil heavy metal pollution prevention, control, and soil protection in the study area.[Methods] We collected and determined the pH levels and the contents of heavy metals including cadmium (Cd), lead (Pb), mercury (Hg), chromium (Cr), arsenic (As), nickel (Ni), copper (Cu), and zinc (Zn) in 61 soil samples from the study area. A range of methods, including index analysis, factor analysis, and cluster analysis, were employed to assess the characteristics and ecological risks of heavy metal pollution, analyze their sources, and simultaneously evaluate the human health risks in the study area.[Results] ① The surface soil of the paddy fields in the study area was acidic. The average contents of Cd, Pb, Hg, Cr, As, Ni, Cu, and Zn were 0.19, 32.74, 0.13, 67.06, 4.43, 24.90, 21.51, and 94.60 mg/kg, respectively. Compared to the soil background values of Zhejiang Province, the average contents of Hg, Cr, Ni, Cu, and Zn exceeded the provincial soil background values by 1.32, 1.71, 2, 1.19, and 1.13 times, respectively. ② Regarding the risk screening values, although the point exceedance rates for Cd, Ni, and Cr were 6.56%, 3.28%, and 1.64%, respectively, the average content of all eight heavy metals in the study area was lower than the corresponding risk screening values for agricultural land soil, represented by the average heavy metal content in the investigated paddy fields. ③ Through factor analysis and other methods, it was found that the sources of soil heavy metals are predominantly human factors, with a combination of human and natural influences; the overall carcinogenic health risk for children was deemed tolerable.[Conclusion] The level of heavy metal pollution in the paddy soil of Qianjiangyuan National Park is low, and the overall ecological risk is slight. However, there are pollution risks associated with Cr and Ni. The heavy metal element As is the primary carcinogenic factor affecting human health.

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  • 收稿日期:2024-09-24
  • 最后修改日期:2024-12-12
  • 录用日期:2024-12-13
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