Separation of Fulvic Acid from Soil Extracts Based on Ion-Pair Formation with a Cationic Surfactant
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Accession number;06A0104550
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| Title;Separation of Fulvic Acid from Soil Extracts Based on Ion-Pair Formation with a Cationic Surfactant |
| Author;
FUKUSHIMA MASAMI
(National Inst. Advanced Industrial Sci. And Technol. (aist), Tsukuba, Jpn)
KIKUCHI ATSUNORI
(National Inst. Advanced Industrial Sci. And Technol. (aist), Tsukuba, Jpn)
TATSUMI KENJI
(National Inst. Advanced Industrial Sci. And Technol. (aist), Tsukuba, Jpn)
TANAKA FUMIKO
(National Food Res. Inst. (nfri), Tsukuba, Jpn)
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Journal Title;Anal Sci
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Journal Code:G0673B
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ISSN:0910-6340
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VOL.22;NO.2;PAGE.229-233(2006)
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| Figure&Table&Reference;FIG.5, TBL.1, REF.26 |
| Pub. Country;Japan |
| Language;English |
| 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 '13'C 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. (author abst.) |
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