• 关键词：城市土壤  Pb  含量  化学形态

• 基金项目：国家自然科学基金重点项目(49831004);中国科学院特别支持项目

• 卢瑛
• 1. 华南农业大学资源环境学院,广州 510642; 2. 中国科学院南京土壤研究所,南京 210008

• 龚子同
• 中国科学院南京土壤研究所,南京 210008

• 张甘霖
• 中国科学院南京土壤研究所,南京 210008

• 摘要：研究了南京城市土壤Pb的含量及其化学形态分布,结果表明:土壤全Pb平均含量为10.73mg/kg,变幅为36.3—472.6mg/kg,土壤Pb污染严重.表层土壤Pb以残渣态和铁锰氧化物结合态为主,各形态比例为残渣态>铁锰氧化物结合态碳酸盐结合态>有机结合态>可交换态.与非城区土壤比较,城市土壤中Pb不仅含量高,而且活性大,对环境危险性大.

• Abstract：The concentration and chemical speciation of Pb in Nanjing urban soils were studied. The results indicated that the mean Pb concentration in urban soils was 107.3mg/kg, ranging from³6.3 to 472.6mg/kg, and urban soils were seriously polluted with Pb. For urban topsoils, the Pb was dominated by residual and Fe Mn oxides fractions, and followed by the order of residual>Fe Mn oxidescarbonate>organic>exchangeable. Compared with Pb in non urban soils, Pb in urban soils had not only elevated concentration, but also higher activity and more serious threat to the environment.

• Key words：urban soils  Pb  concentration  chemical speciation

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