Humic acids from coals of the North-Bohemian coal field II.: Metal-binding capacity under static conditions

被引:57
作者
Cezíková, J [1 ]
Kozler, J [1 ]
Madronová, L [1 ]
Novák, J [1 ]
Janos, P [1 ]
机构
[1] Res Inst Inorgan Chem, CZ-40001 Usti Nad Labem, Czech Republic
关键词
humic acids; metal-binding capacity;
D O I
10.1016/S1381-5148(00)00078-X
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The interactions of metal cations (Al, Ba, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, Ph, Zn) with solid humic acids (HAs) were investigated in a batch arrangement. The sorption of metals on the surface of HAs depends strongly on the pH - sorption decreases with decreasing pH. The metal-binding capacities estimated from the metal-humate binding model range from ca. 0.4 mmol/g (Fe, Ni, Zn) to 1.7 mmol/g, (Pb). Of the examined metal cations, Pb2+ binds most strongly to solid HAs. The order of the metal-humate binding strength is consistent with series found in the literature and is based on the stability constants of metal-humate complexes. In comparison with coal-derived HAs, soil HAs from chemozem (and also low molecular weight HAs) exhibited markedly higher metal-binding capacities, whereas the capacity of oxyhumolite (the raw material fur IIA production) was lower. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:111 / 118
页数:8
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