13C NMR Studies of Humic Acids from Soils

Abstract

Abstract: The ¹³C NMR spectra were measured for humic acids from several cultivated soil (black, brown forest, meadow and paddy soil) in the Northeast of China. Acomparison between humic acids from peat and those from pig manure was also made. The results show that humic acids of soils mainly consist of four types of carbon: corbonyl, aromatical, alkoxy and polymethylene. Their aromaticity is less than 40%. There are some differences among various humic acids from different soils. Humic acids from peat and pig manure are characterized by lower molecular weight and lower degree of oxidation compared with soil humic acids. The aromaticity of the humic acid from peat is much higher than that from pig manure. The results also show that the ¹³C NMR spectrometry can be considered as one. of the most effective methods for investigating the structural characterization of humic substances.

Key words: Soil, Humic acid, Aromaticity

TrendMD:

Dou Sen, Hua Shiying, Zhu Tao. ¹³C NMR Studies of Humic Acids from Soils[J]. Chem. J. Chinese Universities, 1990, 11(7): 768.

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¹³C NMR Studies of Humic Acids from Soils

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