STRONG-ACID, CARBOXYL-GROUP STRUCTURES IN FULVIC-ACID FROM THE SUWANNEE RIVER, GEORGIA .2. MAJOR STRUCTURES

被引：132

作者：

LEENHEER, JA

WERSHAW, RL

REDDY, MM

机构：

[1] U.S. Geological Survey, Water Resources Division, Denver, Colorado 80225

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1995年 / 29卷 / 02期

关键词：

D O I：

10.1021/es00002a016

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Polycarboxylic acid structures that account for the strong-acid characteristics (pK(a1) near 2.0) were examined for fulvic acid from the Suwannee River. Studies of model compounds demonstrated that pK, values near 2.0 occur only if the alpha-ether or alpha-ester groups were in cyclic structures with two to three additional electronegative functional groups (carboxyl, ester, ketone, aromatic groups) at adjacent positions on the ring. Ester linkage removal by alkaline hydrolysis and destruction of ether linkages through cleavage and reduction with hydriodic acid confirmed that the strong carboxyl acidity in fulvic acid was associated with polycarboxylic alpha-ether and alpha-ester structures. Studies of hypothetical structural models of fulvic acid indicated possible relation of these polycarboxylic structures with the amphiphilic and metal binding properties of fulvic acid.

引用

页码：399 / 405

页数：7

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