Comprehensive Analysis of Heavy Metals in Sediments Contaminated by Different Pollutants
Publication: Journal of Environmental Engineering
Volume 138, Issue 4
Abstract
Instrumental analyses were combined with the community bureau of reference (BCR) sequential extraction procedure (SEP) to study heavy metal pollution in sediments exposed to different pollutant compositions (primarily inorganic, primarily organic, and an upstream control sample). Heavy metals accumulated primarily in the nonresidual fractions of sediments as revealed by sequential extraction. The discharge of waste water with different pollutant compositions differentially affected the distribution of heavy metal species in extracts from sediments. Sediment polluted by organic waste water had a higher proportion of heavy metals in the oxidizable fraction. A higher residual fraction was detected in the sample that was polluted by high fluorine waste water. For all sediment samples, most Pb was found in the reducible fraction. The oxidizable fraction contained most of the chemically extractable Cu and Cr (31.6–81.5%); whereas the highest percentage of Zn was found in the residual fraction for all samples (46.9, 37.8, and 65.4%, respectively). The mobility order of the heavy metals studied in polluted sediments was , much different from the order found in the control unpolluted sediment sample.
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© 2012. American Society of Civil Engineers.
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Received: Oct 15, 2010
Accepted: Sep 7, 2011
Published online: Sep 9, 2011
Published in print: Apr 1, 2012
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