化学处理水稻秸秆水溶性有机物的光谱特征研究  

Spectral Analysis of Dissolved Organic Matter Derived from Rice Straw after Chemical Treatment

作　　者：沈其荣[1] 徐勇[1] 杨红[2] 周立祥[1] 郁清[3] 周志萍[3] 

机构地区：[1]南京农业大学资源环境学院,江苏南京210095 [2]南京农业大学理学院,江苏南京210095 [3]南京大学化学化工学院,江苏南京210093

出　　处：《光谱学与光谱分析》2005年第2期211-215,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(30070446);国家科技部"863"项目(2001AA246081)资助

摘　　要：采用紫外(UV)、傅里叶红外光谱(FTIR)和核磁共振(1H和13CNMR)分析技术对13C标记水稻秸秆化学处理过程中的水溶性有机物进行了研究。由光谱变化的分析可见,随着化学处理的进行,水稻秸秆DOM中甲基、亚甲基含量逐渐降低,脂肪性降低;含芳环的化合物逐渐分解,芳香性降低;碳水化合物分解一部分形成碳酸盐类物质,另一部分形成CO2和H2O;羧酸和羧酸脂类化合物形成羧酸盐类物质;有机成分中的无机元素硅释放出来,形成硅酸盐类的无机硅氧化合物;DOM中的氮素以铵盐的形式存在并逐渐积累。Fourier transform infrared spectroscopy (FTIR), ultraviolet spectroscopy (UV), and nuclear magnetic resonance spectroscopy (NMR) were used to study the chemical composition of Dissolved Organic Matter (DOM) derived from rice straw in the hydrolysis process with a dilute complex acid solution. The results obtained are as follows. FTIR spectra could indicate the changes of DOM during the hydrolysis process of rice straw. With the progress of rice straw hydrolysis, methyl, methylene, aromatic compounds and carbonhydrates decreased, most of aliphatic compounds were oxidized to CO2 and H2O, and others were turned into carbonates. Most of the organic silicon was hydrolyzed into inorganic silicon. The proteins, amino acids and other nitrogen were hydrolyzed to NW. All the recalcitrant fractions of rice straw, such as hemi-cellulose, cellulose and silicon sharply decreased during the process of chemical treatment. The results obtained in this paper proposed that the changes of DOM of rice straw in the hydrolysis could be an indication in the changes of chemical composition of rice straw during the hydrolyzation, and FTIR, UV and NMR were good methods to study the changes in the structure of organic compounds.

关 键 词：水稻 秸秆 化学处理 氮素 水溶性有机物 碳水化合物 脂肪 芳香性 亚甲基 傅里叶红外光谱 

分 类 号：O561.3[理学—原子与分子物理] S511[理学—物理]