Abstract
Abstract Fulvic acids were divided into adsorbed brown fractions and non-adsorbed. pale-yellow fractions using insoluble polyvinylpyrrolidone (PVP) as an adsorbent. The distribution pattern of the two fractions varied with the types of soils. The yield of the PVP-adsorbed fraction was higher in the order of brown forest soils, ando soils, and lowland paddy soils and red-yellow soils. The difference spectra between pH 12 and pH 7 (ΔE 7-12 spectra) and those between pH 7 and pH 3 (ΔE 3-7 spectra) of the PVP-adsorbed fractions were classified into three types corresponding to the types of soils. The ΔE 7-12 spectra of the PVP-adsorbed fractions and humic acids obtained from the same soil were similar. In the PVP-non-adsorbed fractions, both the ΔE 7-12 and ΔE 3-7 spectra did not clearly differ among all soils.
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