ELEMENTARY COMPOSITION AND ABSORPTION SPECTRA OF HUMIC AND FULVIC ACIDS
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概要
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Elementary composition and absorption spectra of humic acids (HAs) and fulvic acids (FAs) obtained from 4 Canadian and 2 Japanese soils were determined, and the relationships between these 2 properties were discussed. In this study, FA refers to the PVP adsorbed, i.e. coloured substances in what has been designated, in previous reports, as FA. In 3 soil samples, FA was divided into the acid (pH 1.0)-precipitable FA_1 and non-precipitable FA_2 fractions. 1. In the case of HAs, some correlations were observed between the carbon content and hydrogen content or C/H ratio. The hydrogen and nitrogen contents of the FA and FA_1 samples tended to be higher while those of the FA_2 samples tended to be lower than those of HAs obtained from the same soils. In all cases, conspicuous differences in the elementary composition were found between the FA_1 and Fa_2 fractions. 2. The absorption spectra (log E vs. λ curves, in 0.1 N NaOH) of 5 out of 17 samples of HAs and FAs showed absorption bands due to the dissociation of the dihydroxyperylene quinone moiety (Pg). The absorption spectra of the other 12 samples were almost featureless. E_6(E^<1%>_<600nm>), E_4(E^<1%>_<400nm>), E_<2.5>(E^<1%>_<250nm>), E_4/E_6(E_<400nm>/E_<600nm>) and Pg content were adopted as parameters characterizing the spectra. 3. The pH dependency of the absorption spectra was examined in solutions having various pHs. 4. Several correlations were found between the parameters and the elementary composition of HAs and FAs. Based on the relation between the carbon content and E^<1%> values, FAs were divided into 2 groups. The elementary composition of each group showed distinct regularities.
- 社団法人日本土壌肥料学会の論文
著者
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KUMADA Kyoichi
Faculty of Agriculture, Nagoya University
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Kumada Kyoichi
Faculty Of Agriculture And Water Research Institute Nagoya University
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