Faculty Advisor

DiBiasio, David

Faculty Advisor

MacDonald, John C.

Center

Shanghai, China

Abstract

In this study, the sediment of the Dianshan Lake, one of the major freshwater sources for Shanghai, was analyzed at varying depths to determine its historical environmental toxicity profile. Six heavy metal elements (Cd, Cr, Pb, Zn, Hg, and As) were analyzed, using a three step Sequential Extraction Procedure to determine the speciation of each metal, which gives a more accurate profile on their mobility and bioavailability(toxicity). The order of mobility was found to be Cd > Pb > Zn > Cr > Hg > As. Levels of mobile species of Cr, Zn, Hg, and As were found to increase in the past decade, while Cd and Pb have remained constant. Peaks in mobile or total species concentration for Cr, Pb, and As are observable at 9-13 cm depth, corresponding to China's rapid industrialization in the 1980's.

Publisher

Worcester Polytechnic Institute

Date Accepted

April 2010

Major

Chemistry

Project Type

Major Qualifying Project

Accessibility

Unrestricted

Advisor Department

Chemical Engineering

Advisor Department

Chemistry and Biochemistry

Project Center

Shanghai, China

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