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Relations between extraction protocols for activated sludge extracellular polymeric substances (EPS) and complexation properties of Pb and Cd with EPS: Part II. Consequences of EPS extraction methods on Pb2+ and Cd2+ complexation

Paper ID Volume ID Publish Year Pages File Format Full-Text
18586 42726 2006 7 PDF Available
Title
Relations between extraction protocols for activated sludge extracellular polymeric substances (EPS) and complexation properties of Pb and Cd with EPS: Part II. Consequences of EPS extraction methods on Pb2+ and Cd2+ complexation
Abstract

To study the effect of extraction protocols on extracellular polymeric substances (EPS) metal binding ability, EPS from two activated sludges were extracted by eight extraction protocols: three chemical treatments, four physical treatments and a control. Two pKa, for each EPS, were determined: pKa1 may be specific for carboxyl and phosphoric and pKa2 may be attributed to phenolic and amino functional groups according to EPS composition and IR spectra. EPS pKa values could be affected by the presence of extraction reagents and/or the modifications of EPS by extraction reagents.Complexation study performed at pH 7 by a polarographic method has always showed a greater affinity of EPS for Pb2+ than for Cd2+. The complexation properties of EPS extracted by chemical methods were greatly modified. Concerning EPS extracted by physical methods, their complexation properties were close except for EPS obtained by heating. Standardized extraction methods must be established as a function of the aims of the EPS study.

Keywords
Extracellular polymeric substances; Extraction method; Complexation properties; Cd; Pb; pKa
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Relations between extraction protocols for activated sludge extracellular polymeric substances (EPS) and complexation properties of Pb and Cd with EPS: Part II. Consequences of EPS extraction methods on Pb2+ and Cd2+ complexation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 38, Issues 1–2, 3 January 2006, Pages 246–252
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us