Title: Study on Chemical Fractions and Bioavailability of Heavy Metals in Sewage Sludge
Abstract: The total contents and chemical fractions of heavy metals(Zn, Cu, Cd, Cr, Pb and Ni) in sewage sludge were analyzed in the present study with Tessier's procedure. The bioavailability of these heavy metals was also studied by potting planting of Dockleaf Knotweed. The results showed that the total contents of Zn, Cu, Cd, Cr, Pb and Ni were all less than the Chinese sewage sludge criteria for agricultural use(soil pH≥6.5). As for Zn, Cd, Cr and Pb, residual fraction was the predominant fraction, while for Cu and Ni,organic fraction was the predominant fraction. The proportions of unbioavailable forms of Zn, Cd, Cr and Pb were more than 50%, which was favorable for using sludge in agriculture. The roots of Dockleaf Knotweed could accumulate more heavy metals than shoots. The heavy metals absorbed by potted plant included not only exchangeable and carbonate forms, but also iron- manganese oxides and organic forms which were released under certain conditions.
Publication Year: 2008
Publication Date: 2008-06-25
Language: en
Type: article
Access and Citation
Cited By Count: 1
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot