摘要
测定了珠江广州河段东朗断面底泥中的重金属镉、铬、铜、铅的总量,并采用五态分级法即Tessier形态分类法对镉、铬、铜、铅在底泥中的存在形态进行了提取和测定。结果表明该断面底泥中镉、铬、铜、铅总量均高于全国湖泊底泥中的平均值,以广东土壤背景值为参照可以看出,东朗底泥中镉、铬、铜、铅含量分别为土壤背景值的84.0倍、8.1倍、29.2倍、7.0倍,底泥成为这些重金属的富集地。镉以可交换态为主,占总量比例为59.29%,铬以铁锰态为主,占总量的比例为54.51%,铜以有机态为主,占总量的53.17%,铅以碳酸盐态和残渣态为主,占总量的比例分别36.63%和36.35%。并采用瑞典学者Hakanson提出的潜在生态危害指数法对该断面底泥中的镉、铬、铜、铅进行了潜在生态危害评价,结果表明镉潜在生态危害强,铬潜在生态危害轻微,铜、铅的潜在生态危害中等。
The content of heavy metals in sediment of Donglang section of Guangzhou segment in Pearl River were determined, five forms of heavy metals in sediment were extracted with Tessier five stage sequential extraction procedure, and AAS was applied to examine the concentration of heavy metals in sediment and extracts. Reseult showed that the sum of heavy metals, such as Cd, Pb, Cu, Cr were higher than the background value of soil, and different heavy metals have different value of five forms. Cd is existed as exchanged form, and Cr, Pb are existed as stable form, Cd is easy to resolve to water, and Cr, Pb are relatively stable in sediment. The ecological risk of these four heavy metals were assessed with Hakanson pontential ecological harmful index , which expressed that the ecological risk of Cd is high, and that of Cr, Cu, Pb is lower.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2009年第5期183-186,共4页
Environmental Science & Technology
基金
广东省自然科学基金(6021477)
广东省科技计划(2006B36801002)
关键词
底泥
重金属
生态危害
东朗断面
sediment
heavy metal
ecological risk
Donglang section
