Characteristics of soil humic acid fractions separated by ultrafiltration

被引：42

作者：

Lobartini, JC ^{[1
]}

Orioli, GA ^{[1
]}

Tan, KH ^{[1
]}

机构：

[1] UNIV GEORGIA,DEPT CROP & SOIL SCI,ATHENS,GA 30602

来源：

COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS | 1997年 / 28卷 / 9-10期

关键词：

D O I：

10.1080/00103629709369830

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Different molecular weight fractions obtained by ultrafiltration of a humic acid (HA) extracted from a Mollisol were analyzed by chemical, infrared, electron microscopy, and isotachophoresis methods. The results showed that the different HA ii-actions did not differ substantially in characteristics from each other, although each fraction was composed of subfractions exhibiting different electromobilities. It appeared that fractionation of HA would yield molecular weight fractions as imposed by any exclusion limits used in the procedure. However, the elemental composition, infrared spectra, and electron micrographs showed that the fractions, separated by molecular weight limits, contained similar compounds. These results do not support the concept of humic acids as a heterogeneous mixture of compounds, but show instead that humic acids may possess a composition more homogeneous in nature than previously postulated.

引用

页码：787 / 796

页数：10

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