Fine fractionation and purification of the fulvic acid fraction using adsorption and precipitation procedures(Soil Chemistry)

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概要

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• 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 coprecipitated 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 ^<13>C 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 FA-4 and were hydrophobic (estimated hydrophobicity: humic acid >>FA-4≥FA-3>>FA-2≥FA-1). A fulvic acid that can be isolated using the International Humic Substances Society method would be, in practice, a mixture of hydrophilic fulvic acid (FA-2) and hydrophobic fulvic acid (FA-3 + FA-4). The method developed in the present study will provide more detailed, quantitative and complete information of the fulvic acid fraction of soils.

• 社団法人日本土壌肥料学会の論文

著者

• HIRADATE Syuntaro

  Biodiversity Division, National Institute for Agro-Environmental Sciences

• Hiradate Syuntaro

  Biodiversity Division National Institute For Agro-environmental Sciences

• Yonezawa Takuya

  Faculty Of Agriculture Meiji University

• TAKESAKO Hiroshi

  Faculty of Agriculture, Meiji University

• Takesako Hiroshi

  Faculty Of Agriculture Meiji University

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