Fine fractionation and purification of the fulvic acid fraction using adsorption and precipitation procedures

Autor:	Syuntaro Hiradate, Takuya Yonezawa, Hiroshi Takesako
Rok vydání:	2007
Předmět:	chemistry.chemical_classification Chromatography Chemistry Elution Precipitation (chemistry) Soil Science chemistry.chemical_element Fraction (chemistry) Plant Science Fractionation Adsorption Distilled water Humic acid Carbon
Zdroj:	Soil Science and Plant Nutrition. 53:413-419
ISSN:	1747-0765 0038-0768
DOI:	10.1111/j.1747-0765.2007.00159.x
Popis:	A new scheme for fine fractionating and purifying a crude fulvic acid fraction was proposed. The fractionation procedure includes an adsorption process of the fulvic acid fraction on a hydrophobic resin (e.g. XAD-8 and DAX-8) and a sequence of successive elution processes. This procedure yields a non-adsorbed fraction (FA-1), a 0.1 mol L−1 HCl eluted fraction (FA-2), a distilled water eluted fraction (FA-3) and a 0.1 mol L−1 NaOH eluted fraction (FA-4). To remove salts and water, the fractionated organic molecules were co-precipitated with Al hydroxides at pH 5 and collected by centrifugation. Recoveries of carbon from the crude fulvic acid fraction of an Andosol were 42, 20, 19 and 14% for FA-1, FA-2, FA-3 and FA-4, respectively, and 96% of carbon was recovered in total. Optical properties and 13C nuclear magnetic resonance spectra indicated that the chemical properties of FA-1 were similar to those of FA-2 and were hydrophilic, while the chemical properties of FA-3 were very close to those of F...
Databáze:	OpenAIRE
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