摘要
讨论了108个取自漳州市城区公园、生活区及环城菜地等不同功能区的表层(0～20cm)土壤样品中重金属含量及分布特点,根据土壤中重金属元素与主元素间的相关分析、聚类分析,探讨了影响土壤中重金属分布和来源的因素。结果表明,漳州市城市土壤Hg、Cd、Pb、Cu、Zn、As、Cr和Ni的平均含量分别为0.471mg/kg、0.353mg/kg、75.9mg/kg、32.6mg/kg、106.7mg/kg、6.86mg/kg、29.7mg/kg和12.8mg/kg,其中相对于区域土壤背景值与国家土壤环境质量标准,污染较突出的元素是Hg和Cd。深受人为污染活动影响的城区土壤和菜地土壤重金属平均含量也尤为突出,城区土壤Hg平均含量最高,菜地土壤Cd平均含量最高。元素的相关性分析和聚类分析结果表明Hg相对于其他元素表现较独立,S对Hg有一定的捕获能力;As、Cr和Ni是受控于成土母质的元素组合;Cd和Pb是受人为污染影响较强的元素,Cu来源于地质成因的比例较大;Zn受控于土壤中锰氧化物粘粒。
Human health in towns and cities is strongly dependent on the status of urban soils. Urban soils may be affected by industrial activities, traffic, agricultural practices, and waste disposal. Interest in trace elements in urban environments has rapidly increased as a consequence of the high levels of contamination measured in some cities, and the associated potential health risks. Concentrations of Hg, Cd, Pb, Cu, Zn, As, Cr and Ni were measured in 108 topsoil samples collected from parks, residential areas and suburban agricuhural soils in the city of Zhangzhou, Fujian Province, China in order to assess the distribution of these heavy metals in the urban environment and identify possible sources of pollution, and other heavy element contents of the topsoils were determined to find out the controlling factors of heavy metal contents and their distribution. Mean contents of Hg, Cd, Pb, Cu, Zn, As, Cr and Ni in topsoils in Zhangzhou City are 0.471, 0. 353, 75.9, 32.6, 106. 7, 6. 86, 29.7 and 12.8 mg/kg, respectively. Compared to the background values for soils in Fujian Province, Hg and Cd are the strongest enriched elements; Pb and Cu are moderately enriched elements; Zn and As are close to the background values; while Cr and Ni are lower than the background ones. Compared to soil environmental quality standards of China, Hg and Cd are the most seriously polluted elements in Zhangzhou City. And among the investigated soils, urban soils have the highest content of Hg, and vegetable soils have the highest content of Cd. Heavy metal contents in urban soils and vegetable soils reflect human impacts on soils. Statistic approaches （correlation matrix and cluster analysis） were adopted for identification of natural and anthropic influence on heavy metal contents. The results demonstrate that the distribution of Hg does not appear to be associated with any other elements, while S may be capturer for Hg; As, Cr and Ni are elements controlled by pedogenesis; Cd and Pb are elements disturbed by anthropic contributions; Cu is mainly controlled by pedogensis and Zn is closely association with Mn oxides in soils.
出处
《地球化学》
CAS
CSCD
北大核心
2005年第6期635-642,共8页
Geochimica
基金
中国地质调查局国土资源大调查项目(1212010310307)~~
关键词
重金属
土壤
相关分析
聚类分析
漳州市
heavy metals
soils
correlation analysis
cluster analysis
Zhangzhou City
