首页|Characterization of Chinese Standard Fulvic Acid Fractions Obtained by Sequential Extractions with Pyrophosphate Buffer from Forest Soil
Characterization of Chinese Standard Fulvic Acid Fractions Obtained by Sequential Extractions with Pyrophosphate Buffer from Forest Soil
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NETL
Chinese standard fulvic acid (CSFA) from the forest soil having regional characteristics of northeast China has been designated by the Chinese Research Academy of Environmental Sciences。To better understand its environmental behavior and interaction mechanisms with contaminants，it is necessary to separate the CSFA into different fractions by reducing its heterogeneity。With XAD-8 resin adsorption method，five fractions of CSFA were obtained by sequential elution with pH 3，5，7，9，and 13 buffers，respectively。CSFA and its fractions were characterized by elemental analysis，FT-IR，and 13C-NMR。The results show that the fractions eluted at higher pH have fewer carboxylic groups，and more alkyl and aromatic groups，than fractions eluted at lower pH。The fractionation of CSFA，as well as its free future availability，will benefit to investigations of the environmental behavior of soil FA in China。
Chinese standard fulvic acidSequential extractionPyrophosphate buffer
Yingchen Bai、Fengchang Wu、Guolan Shi
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Chinese Research Academy of Environmental Sciences,Beijing,100012,China
School of Environment and Chemical Engineering,Nanchang University,Nanchang,330031,China
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