细河流域农田土壤重金属污染评价及来源解析

发布时间：2018-02-13 12:57

  本文关键词： 细河 重金属 污染评价 PMF 源解析　出处：《农业环境科学学报》2017年03期 　论文类型：期刊论文

【摘要】：由于长期接纳沈阳市工业废水和生活污水,细河水质和周边土壤污染严重。2015年10月采集细河流域农田表层(0~20 cm)土壤样品134份,分析土壤中重金属Hg、As、Pb、Cd、Ni、Cr、Zn和Cu的含量分布特征并进行污染评价,首次采用正定矩阵因子分析法(PMF)对该地区8种重金属来源进行分析,为土壤重金属源解析方法学评价提供依据。结果表明:细河流域农田土壤中Hg、As、Pb、Cd、Ni、Cr、Zn、Cu含量范围分别为0.04~1.85、4.80~11.70、10.80~36.70、0.09~1.50、22.30~47.40、19.60~104.00、71.40~242.00、31.20~105.00 mg·kg~(-1),其中Hg、Cd、Zn、Cu、Ni和Cr含量均值是沈阳市土壤背景值的3.80、2.50、2.04、2.03、1.14倍和1.02倍,Cd、Cu和Hg的含量超过土壤环境质量标准(GB 15618—1995)样点比例分别为48%、9%、9%。单因子污染指数评价结果显示Hg和Cd污染最为严重,污染指数均值分别为4.52和2.96;内梅罗综合污染指数均值为4.13,说明研究区域总体为重度污染。PMF模型解析出重金属污染来源有:工业污染源贡献率36.5%,交通污染源和大气沉降综合污染源贡献率23.5%,农业污染源贡献率20.8%,自然成土母质源贡献率19.2%。
[Abstract]:Due to the long-term acceptance of industrial wastewater and domestic sewage in Shenyang, the water quality of the river and the surrounding soil are seriously polluted. In October 2015, 134 soil samples were collected from the surface layer of farmland in the river basin. In this paper, the distribution characteristics of heavy metal Hgzn and Cu in soil were analyzed, and the pollution was evaluated. The source of 8 heavy metals in this area was analyzed by positive definite matrix factor analysis (PMF) for the first time. The results showed that the content range of HgsAsPbCdCU NiCrCrZnZn-Cu in farmland soil was 0.041.854.8011.7011.7010.8010.800.046.709.501.500.300.4019.6047.604.604.6071.4031.20mg 路kg ~ (-1) mg 路kg ~ (-1) ~ (-1), and the mean values of HgncCuCuCu Ni and Cr were 3.80 ~ 2.502.042.031.14 times and 1.02 times of the soil background value of Shenyang City respectively, and the average values of the contents of ZnCuCu and Cr were 3.80 ~ 2.502.042.031.14 times and 1.02 times of the soil background value of Shenyang City, respectively. The results of single-factor pollution index evaluation showed that Hg and CD pollution were the most serious. The mean value of pollution index was 4.52 and 2.96, respectively, and the mean value of Nemero comprehensive pollution index was 4.13, which indicated that the pollution sources of heavy metals in the study area were heavy pollution. PMF model showed that the sources of heavy metal pollution were: 36.5 percent of industrial pollution sources, 36.5 percent of traffic pollution sources and air pollution. The contribution rate of comprehensive pollution source of sedimentation was 23.5. the contribution rate of agricultural pollution source was 20.8. the contribution rate of natural parent material source was 19.22.
【作者单位】： 中国科学院大学资源与环境学院;中国科学院沈阳应用生态研究所;
【基金】：国家科技部国家重点研发计划项目(2016YFD0800303) 农业部国家风险评估国家农产品质量安全风险评估项目(GJFP201601306)~~
【分类号】：X825
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本文编号：1508216