北京市表层浮土和水体底泥中汞的赋存形态及其相互关系

STUDY ON MERCURY SPECIES OF BEIJING SURFACE SOILS AND SEDIMENTS

应用分级萃取法测定了12个北京市表层浮士和3个水体底泥中汞的赋存形态,并应用多元统计分析对其相互关系进行了研究.北京市表层浮土中汞的含量分布变异较大,但其趋势为:残渣态>强有机结合态>水溶态>其它形态.各形态汞含量主要取决于上壤和底泥中汞含量的大小,其次才是环境因素.强有机结合态和残渣态是主要的赋存形态,对汞在土壤和底泥中的固定起着重要的作用.较易移动的水溶态、FA结合态和交换态对汞在环境中的迁移转化也有一定的影响.盐酸提取态汞主要包括水溶态、交换态、FA结合态和碳酸盐结合态.

The mercury species in 12 Beijing surface soil and 3 sediment samples were measured with SEPs, and the dates were analyzed using multivariate statistical examination. The results show that the variances in each species are very large, and the different Hg species contents follow the order: residue Hg> strongly bound-organic Hg>aqueous solved Hg>other species. Correlation and principal component factor analyses indicate that the direct and indirect effects of species on each other exit. The Hg species mainly depend on the Hg amount in soils and sediments , and also are controlled by environmental conditions. Residue Hg and strongly bound-organic Hg is majority forms, which fix Hg in soils and sediments. Easily portable Hg species affect the transformation of Hg in environment. HC1 extractable Hg contains mainly aqueous solved Hg, exchangeable Hg, FA-binding Hg and carbonate-binding Hg.