The role of humic substances in chromium sorption onto natural organic matter (peat)

被引:44
作者
Kyziol, J.
Twardowska, I.
Schmitt-Kopplin, Ph.
机构
[1] Polish Acad Sci, Inst Environm Engn, PL-41819 Zabrze, Poland
[2] GSF, Natl Res Ctr Environm & Hlth, Inst Ecol Chem, D-85758 Neuherberg, Germany
关键词
natural organic matter; peat; humic substances; chromium; sorption; mobilization; particle size fractions;
D O I
10.1016/j.chemosphere.2005.09.042
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
To elucidate mechanisms of Cr3+ sorption onto the unaltered solid natural organic matter, the comparative studies of this ion binding from a solution at pH 4.0 onto three selected particle size fractions: 2000-1000 mu m, 630-200 mu m and 63-20 mu m of markedly different HS content and structure, separated by a wet sieving from an overall sample of peat (Brushwood Peat Humus) were carried out. Comparable patterns of COOH groups and CECt confirmed that for cation exchange capacity were responsible mainly cations connected with COO- functional groups. It was though found that aliphatic acids in the solid state did not take part in Cr3+ binding, thus the finest studied fraction 63-20 mu m of the highest contents of functional groups showed the lowest sorption capacity for Cr3+, while similar patterns of sorbed Cr3+, soluble HS content and base CEC0 indicated that these parameters were directly interrelated. The base ion exchange processes determined by CEC0 (with Ca2+ as a predominant exchangeable cation) appeared to be not the major mechanisms responsible for Cr3+ sorption. For this metal, strong binding to insoluble large molecular weight organic pool two- to threefold prevailed over the ion exchange processes. Very low acid desorption indicated generally low mobility of Cr3+-organic compounds. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1974 / 1982
页数:9
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