非污染土壤中颗粒态有机质对重金属的富集作用  

Enrichment of Heavy Metals in Particulate Organic Matter from Non-polluted Soils

作　　者：郑顺安[1] 王丽平[1] 章明奎[1] 

机构地区：[1]浙江大学环境与资源学院资源科学系,杭州310029

出　　处：《科技通报》2008年第4期548-552,558,共6页Bulletin of Science and Technology

基　　金：国家自然科学基金(40771090;40471064);浙江省自然科学基金(R306011)

摘　　要：为了解未受重金属明显污染土壤中颗粒态有机质是否存在重金属的富集现象,从浙北平原采集了23个农业土壤样品,采用物理与化学相结合的方法,分析了土壤有机质、土壤颗粒态有机质(POM)含量及土壤和颗粒态有机质中重金属(Cu、Pb、Zn、Cd)的分布。结果表明,虽然供试土壤重金属含量均未超出土壤重金属环境质量二级标准,但这些土壤中POM对重金属均呈显著的富集作用,Cu、Pb、Zn、Cd的富集系数分别为5.4～13.5、4.7～10.3、3.8～10.4和3.8～12.3,并随POM粒径减小而增加。富集系数一般是砂质土壤高于壤土和粘土。土壤有机质含量对POM的重金属富集效果也有一定的影响,中量有机质土壤>低量有机质土壤>高量有机质土壤。分析认为非污染土壤中POM对重金属的富集机理主要是有机质与土壤重金属相互作用的结果。In order to understand whether heavy metals are enriched by particulate organic matter （POM）in non-polluted soils, 23 soil samples were collected from northern Zhejiang plain. Contents of organic matter and POM, and concentrations of heavy metals in the soils and POM fractions were characterized using physical and chemical methods. The concentrations of Cu, Pb, Zn and Cd in all the soils were below their criteria values of the second grade in national standards of the soil heavy metals environmental quality, but heavy metals in the soils were significantly enriched in particulate organic mater. The enrichment factors of Cu, Pb, Zn, and Cd were 5.4-13.5,4.7-10.3,3.8-10.4 and 3.8-12.3, respectively, and increased with decreasing size of the POM fraction. The enrichment factors were generally higher in sandy soils than loamy and clayey soils. Soil organic matter also had effect on the enrichment factor. The enrichment of metals in the POM fractions was not completely due to decomposition of plant debris. Our results emphasized that POM metal enrichment is liked to SOM-heavy interactions in the non-polluted soil.

关 键 词：重金属 富集 非污染土壤 吸附作用 

分 类 号：X53[环境科学与工程—环境工程]