广州市城区土壤重金属空间分布特征及其污染评价

The Distributive Character and Pollution Assessment of Heavy Metals in Urban Soil of Guangzhou

研究了广州市不同土地利用背景下的7个功能区的5种重金属元素(Ni、Cr、Pb、Zn、Cu)的含量和存在形态,对重金属与土壤性质的关系进行了初步的研究,并对重金属污染状况进行了总体评价,结果表明:重金属在土壤中已有一定程度的积累,在工业区和新居住区的积累程度比较高,Pb的污染最为严重,已经达到了警戒水平。重金属在存在形态上亦存在差异,Ni、Cu、Cr以残渣态所占的比例最高,Zn、Pb则以铁锰氧化态含量最高。

The concentrations of and forms Ni, Cr, Pb, Zn and Cu in different functional zones are studied, the relationship between heavy metals and soil characteristics is analyzed. The results indicated that the surface soil was contaminated by heavy metals, especially in old industry and new residence zones. The concentration of Pb is high and should be paid more attention. Residual form were the major fraction of Ni, Cu and Cr, but the major form of Zn and Pb is Fe-Mn oxide form.