摘要
用红外光谱分析和热失重分析法对从蓝藻腐殖化过程中提取的胡敏酸的元素组成及结构特征进行分析。结果表明:蓝藻好氧厌氧发酵过程中有机碳、有机氮表现出下降的趋势,且好氧阶段大于厌氧阶段。至模拟实验结束,C/N比由最初的5.939升至9.962,趋近于其中所含胡敏酸的C/N比10.93。胡敏酸的红外光谱解析显示,不同处理阶段样品胡敏酸在波数(2920+2850)/1630(脂肪碳/芳碳)处吸收峰面积比分别为1.23,2.73,0.78,0.83,芳碳含量增加,表明厌氧过程有助于胡敏酸结构的芳构化。热失重分析显示发酵生成的胡敏酸有两个明显失重峰值290℃和340℃,主要是非核部分脂肪侧链及氢键结合OH的裂解,说明蓝藻发酵生成的胡敏酸主要以脂肪族为主,结构相对于土壤胡敏酸较为简单。结合样品中可溶性有机质族组分中饱和烃与芳香烃含量的比较,厌氧处理中芳香烃组分成倍增加,亦说明胡敏酸芳构化程度增高,为腐泥型干酪根早期演化提供了实验依据。
Humic acid-type polymers synthesized in algae compost by ammonifying bacteria, nitrobacteria, desulfurizing bacteria, denitrifying bacteria and sulphate reducing bacteria, were analyzed for elemental composition, infrared spectroscopy （IR） and thermal gravimetric analysis （TGA） properties. Results were discussed in comparison with range values referred for soil humic acids. The elemental composition of samples showed that the levels of C and N decreased in the process of aerobic and anaerobic degradation of cyanobacteria. At the stage of aerobic degradation the change was more significant. When the simulation experiment finished, C / N ratio rose to 9.962 from the initial 5.939. This ratio was close to C / N ratio （10.93） of humic acid synthesized in the compost. The IR absorption peak area ratios in the wave number （2920 2850） / 1630 （aliphatic carbon/ aromatic carbon） of HA synthesized at different stages were 1.23, 2.73, 0.78, and 0.83, indicating that aromatic carbons content increased. TGA analyses show that HA has two obvious weight loss peaks at 290~C and 340~C, mainly involved in the breakup of aliphatic sides chain and hydrogen bonded-OH groups in non-nuclear part, indicating that HA originated from alage has more aliphatic carbons in comparison with soil HA. The result of group components of dissolved organic matter showed that aromatic hydrocarbon doubled in the anaerobic degradation. In the simulation process, HA tended to aromatization. This provides an experimental basis for the early evolution of sapropelic kerogen.
出处
《高校地质学报》
CAS
CSCD
北大核心
2012年第4期773-780,共8页
Geological Journal of China Universities
基金
国家自然科学基金(40972092
41172121)
国家自然科学联合基金(40739902)联合资助
关键词
蓝藻
胡敏酸
红外光谱
热失重分析
Cyanobacteria
Humic acid
IR spectra
TGA analysis
