期刊
ENZYME AND MICROBIAL TECHNOLOGY
卷 38, 期 1-2, 页码 246-252出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.enzmictec.2005.06.023
关键词
extracellular polymeric substances; extraction method; complexation properties; Cd; Pb; pK(a)
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 pK(a), for each EPS, were determined: pK(a1) may be specific for carboxyl and phosphoric and pK(a2) may be attributed to phenolic and amino functional groups according to EPS composition and IR spectra. EPS pK(a) 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. (c) 2005 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据