PMID: 16512413Mar 4, 2006Paper

Separation of fulvic acid from soil extracts based on ion-pair formation with a cationic surfactant

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
Masami FukushimaFumiko Tanaka

Abstract

A novel method for separating fulvic acid (FA) from soil extracts is proposed. The FA, defined as the acid-soluble fraction of an alkaline extract of soil, was separated based on the precipitation of an ion-pair with a cationic surfactant, such as domiphen bromide. The precipitate was dissolved in aqueous HCl to produce H+ -type FA and a surfactant chloride (SUR-Cl). SUR-Cl, in the aqueous solution, was removed by extraction with CHCl3. After the aqueous phase was passed through a cation-exchanger (H+ -type), H+ -type FA (FA-SUR) was obtained as a powder by lyophylization. The chemical characteristics of FA-SUR were compared with an FA sample separated according to the method of the International Humic Substances Society using a DAX-8 resin (FA-DAX). The oxygen content, O/C atomic ratio and total acidity of the FA-SUR were significantly larger than the corresponding values for FA-DAX. The solid-state CPMS 13C NMR spectra indicated that the higher oxygen content of the FA-SUR could be due to alcoholic hydroxyl groups and polysaccharides as well as carboxylic groups. These results show that FA-SUR is more polar and hydrophilic than FA-DAX.

Citations

Jul 29, 2008·Bioresource Technology·Masami FukushimaShigekazu Horiya
Apr 11, 2008·Toxicology in Vitro : an International Journal Published in Association with BIBRA·Ming-Hsuang ChoMenghang Xia
Nov 14, 2017·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Hisanori Iwai
Nov 11, 2008·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Shinichi AokiEtsu Yamada

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