玉米秸秆堆腐过程中形成富里酸的结构分析

Structure Analysis of the Fulvic Acids Extracted from Composted Corn Stalk Residue

采用傅里叶变换红外光谱及~1H和^(13)C核磁共振波谱对玉米秸秆堆腐过程中形成的富里酸(CSR FA)的结构进行了表征.结果表明,玉米秸秆腐解过程中形成的富里酸包括羧基或羰基基团、芳香结构、烷基片断和碳水化合物结构.

Chemical structure of fulvic acids extracted from composted com stalk residue(CSR FA)was studied by Fourier transform infrared (FTIR)spectroscopy, 1H and 13C nuclear magnetic resonance(1H-NMR, 13C-NMR) spectroscopy. The results show that CSR FA mainly consists of four types of carbon: carbonyl, aromatical, alkyl and carbohydrate, the carbohydrate is dominant. Its aromaticity is 15.42%, less than that of CSR HA. This indicates that the construction of CSR FA is simpler than that of CSR HA, FA can not be extracted from undecomposed com stalk residue. CSR FA may be formed by cellulose or hemicellulosemorties combined with aromatic compound from decomposed lignin.