地学前缘 ›› 2010, Vol. 17 ›› Issue (4): 253-261.

• 论文 • 上一篇    下一篇

基于多元统计和傅立叶和谱分析的土壤重金属的来源解析及其风险评价

李勇,周永章,窦磊,杜海燕,赖启宏,林小明,范瑞,杜敏   

  1. 1中山大学 地球科学系, 广东 广州 510275
    2广东省地质调查院, 广东 广州 510080
    3广东省环境技术中心, 广东 广州 510630
    4广东省中山市环境保护局, 广东 中山 528400
    5广东省地质过程与矿产资源探查重点实验室, 广东 广州 510275
    6中山大学 地球环境与地球资源研究中心, 广东 广州 510275
  • 收稿日期:2009-12-04 修回日期:2009-12-18 出版日期:2010-07-01 发布日期:2010-07-01
  • 作者简介:李勇(1980—),男,博士研究生,生态地球化学研究方向。E-mail:liyn8@mail2.sysu.edu.cn
  • 基金资助:

    广东省自然科学基金研究团队项目(06202438);广东省科技厅重大专项攻关资助项目(2004A3030800);中国地质调查项目(基［2005］011-16)

Soil heavy metal sources identification and associated risk assessment using multivariate statistical and Fourier spectral analysis. 

 LI  Yong, ZHOU  Yong-Zhang, DOU  Lei, DU  Hai-Yan, LAI  Qi-Hong, LIN  Xiao-Meng, FAN  Rui, DU  Min   

  1. 1Department of Earth Science, Sun YatSen University, Guangzhou 510275, China
    2Guangdong Institute of Geological Survey, Guangzhou 510080, China
    3Guangdong Center of Environmental Technology, Guangzhou 510630, China
    4Zhongshan Environmental Protection Bureau, Zhongshan 528400, China
    5Guangdong Provincial Key Lab of Geological Process and Mineral Resource Survey, Guangzhou 510275, China
    6Center for Earth Environment and Resources, Sun YatSen University, Guangzhou  510275, China
  • Received:2009-12-04 Revised:2009-12-18 Online:2010-07-01 Published:2010-07-01

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摘要：

分析珠江三角洲腹地佛山顺德区208个蔬菜地表层土样Cu、Ni、Cr、As、Pb、Zn、Cd和Hg等8种重金属的全量,结果表明,8种重金属的平均浓度高于广东省土壤背景值。Cd和Hg的最高浓度和变异系数分别为654 mg/kg、115%和482 mg/kg、151％,暗示Cd和Hg的人为来源。多元统计与傅立叶和谱分析的结合,解释了Cr、Ni和Cu的自然来源,Pb、Zn、As、Cd和Hg的人为来源;傅立叶和谱分析进一步阐释了Zn与Cu的双重来源,并推断土壤Hg来源于大气沉降。研究区内大约217％的土壤受重金属污染,表明需要调整该区的农业生产活动。

关键词: 重金属, 多元统计, 傅立叶和谱分析, 珠江三角洲经济区

Abstract:

In the Shunde Area of Foshan, Pearl River Delta Economic Zone, 208 topsoil samples were collected from vegetable fields to measure the contents of copper, nickel, chromium, arsenic, lead, zinc, cadmium, and mercury. The results showed that the average concentration of all these eight heavy metals were higher than their background values of Guangdong Province. Coefficients of variation of Cd and Hg reached as high as 115％ and 151％ respectively, coupling with high concentrations, which suggested anthropogenic sources of these elements. Cr, Ni and Cu displayed low coefficients of variation, thus suggesting a major natural source. The combination of multivariate statistical and Fourier spectral analysis methods successfully identified the elements Pb, Zn, As, Cd and Hg from anthropogenic sources and Cr, Ni and Cu from natural source. Furthermore, Fourier spectral analysis not only interpreted the double sources of Zn and Cu, but also inferred that atmosphere deposition could be an important source of Hg enrichment in soil. According to the pollution evaluation, 217 percent of the study area is suffered from moderate and severe pollution, indicating the requirement of modifications in agricultural cultivation practices in these areas.

Key words: heavy metal, multivariate statistics, Fourier spectral analysis, Pearl River Delta Economic Zone

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