Acid/base and complexation properties of humic and fulvic acids isolated from vermicompost

被引：4
|
作者：
Colombo, Sandro de Miranda
dos Santos, Luciana Bagdeve de Oliveira
Masini, Jorge Cesar
Abate, Gilberto
机构：
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05513970 Sao Paulo, Brazil
[2] Univ Fed Parana, Dept Quim, BR-81531990 Curitiba, Parana, Brazil
来源：
QUIMICA NOVA | 2007年 / 30卷 / 05期
关键词：
humic substances; proton binding; complexation;
D O I：
10.1590/S0100-40422007000500039
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Proton binding properties of humic and fulvic acids were studied by potentiometric titration. Carboxylic groups were the predominant ionizable sites in comparison to phenolic and amine groups. Total acidity of fulvic acid was 12 x 10(-3) mol g(-1), a number significantly higher than that obtained for humic acid (5.2 x 10(-3) mol g(-1)). Copper ion binding was evaluated at pH 4, 5 and 6 by potentiometric titration with an ion selective electrode for Cu(II). Differential stability constants and complexation capacities were systematically higher for humic acid, despite its lower number of ionizable sites in comparison with fulvic acid.
引用
收藏
页码：1261 / 1266
页数：6
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