广州城市水体沉积物中重金属形态分布研究

选取广州城市水体中的４ 个污染沉积物样品，采用连续提取法研究沉积物中重金属元素（ Ｐｂ 、 Ｚｎ 、 Ｃｕ 、 Ｎｉ 、 Ｃｒ 、 Ｍｎ） 的形态分布，结果表明：重金属元素主要以残渣态、有机结合态和氧化铁结合态存在，其中 Ｐｂ 、 Ｎｉ、 Ｍｎ 以残渣态和氧化铁结合为主， Ｚｎ 以残渣态和有机结合态为主， Ｃｕ 以有机态和氧化铁结合态为主， Ｃｒ 以氧化铁结合态为主。沉积物中固相组分对重金属的富集能力为：无定型氧化锰＞ ＞ 碳酸盐＞ 氧化铁＞ 有机质，而富集量则是后两者大于前两者。

A Study on Heavy Metal Speciation in Sediments from Guangzhou Water Body.

This paper investigated the speciation of heavy metals(Pb, Zn, Cu, Ni, Cr, and Mn)in selected four contaminated sediments from Guangzhou water body by sequential chemical extraction protocol . The results showed that heavy metals were associated mainly with residual phase, organic phase and iron oxides phase. Among heavy metals, Pb, Ni, Mn were associated mainly with residual and iron oxides phase, Zn with residual and organic phase, Cu with organic and iron oxides phase, and Cr with iron oxides phase, respectively. The enriching efficiency of solid components in sediments for heavy metals is as follows: amorphous manganese oxide>>carbonate>iron oxides>organic matter, whereas the enriching amount of the latter two was larger than the former two.