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Complexations in illite-fulvic acid-Cu2+ systems

被引：19
作者：
Du, Q
Sun, ZX
Forsling, W [1 ]
Tang, HX
机构：
[1] Lulea Univ Technol, Div Inorgan Chem, S-97187 Lulea, Sweden
[2] Acad Sinica, Ecoenvironm Sci Res Ctr, SKLEAC, Beijing 100085, Peoples R China
来源：
WATER RESEARCH | 1999年 / 33卷 / 03期
关键词：
illite; fulvic acid; heavy metal; complexation;
D O I：
10.1016/S0043-1354(98)00263-2
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
As part of an extended project to illustrate how :heavy metals are complexed by natural aquatic particles, we conducted various experiments to study the adsorption of fulvic acid (FA) at aqueous illite surfaces and the complexation of heavy metal copper(II) in illite-FA bi-complexant systems. By analyzing batch adsorption and potentiometric titration data, we found that (i) the adsorption of FA by illite decreases with increases in pH values and its pH adsorption edge resembles those of SiO2-FA and montmorillonite-FA systems described by other researchers, (ii) it is possible to effectively simulate the complexation of Cu2+ ions in illite-FA bi-complexant systems by taking it to be an additive complexation of two mono-complexant systems (FA-Cu2+ and illite-Cu2+) and (iii) FA can inhibit the retention of heavy metals at solid surfaces by forming soluble complexes with metal ions. The above results and conclusions are supported by FT-IR analysis of various illite-FA-Cu2+ systems. (C) 1998 Elsevier Science Ltd. All rights reserved.
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页码：693 / 706
页数：14
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