SOLUBILITY AND FRACTIONATION OF HUMIC-ACID - EFFECT OF PH AND IONIC MEDIUM

被引：125

作者：

KIPTON, H ^{[1
]}

POWELL, J ^{[1
]}

TOWN, RM ^{[1
]}

机构：

[1] UNIV CANTERBURY,DEPT CHEM,CHRISTCHURCH 1,NEW ZEALAND

来源：

ANALYTICA CHIMICA ACTA | 1992年 / 267卷 / 01期

关键词：

GEL PERMEATION CHROMATOGRAPHY; EQUILIBRIUM DIALYSIS; FULVIC ACIDS; HUMIC ACIDS; WATERS; SOILS;

D O I：

10.1016/0003-2670(92)85005-Q

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Gel permeation chromatography (GPC), in conjunction with equilibrium dialysis, was used to probe the fractionation of humic substances on dissolution in several media (KNO3, Na4P2O7, and synthetic sea water) as a function of pH and ionic strength. The solubility of humic acid (and the proportion of "large" molecules in solution) increased with increase in pH and decreased with increase in ionic strength. A pH of at least 8.0 was required to solubilize a " representative" fraction of a humic acid sample (based on GPC). Pyrophosphate (0.001 mol l-1, pH 9) is proposed as a suitable solvent for the extraction of humic acid from soil.

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页码：47 / 54

页数：8

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