Extractability and Bio-Availability of Heavy Metals in Municipal Sludge

Abstract

Adopted five kinds of extractants respectively to extract the availability of heavy metals Cd, Pb, Ni, Zn, Cufrom the stabilized municipal sludge, at the same time did wheat pot experiments. Then made correlation analysis between the extracting content and the accumulation amount in wheat leaves and roots. It showed that the availability contents of each elements was quited different from the others. Compared with other four extractants, EDTA was in obvious advantages for its best correlation degree. However, comparatively speaking, Pb and Zn don't had so obvious correlation. It may be related with the transfer ability of one element from roots to leaves. The results showed that EDTA was a more satisfactory extractant.