Abstract:Surface sediment samples from Basong Lake located in the south-eastern Tibet were collected and characterized by UV spectroscopy and GC-MS. The results showed that the UV absorbance of humic and fulvic acid in the lake surface sediments increased significantly from the 200~400nm range to the 400~800nm range. A weak and broad twin absorption peaks near 270nm in fulvic acid samples indicated the presence of aromatic ring structure. A generally low absorption of humic and fulvic acid at 254nm suggested a low content of non-degradable organic matter in the samples. The analysis of the characteristic values of UV absorption (A465/A665) showed that the humification degree in the surface sediments of Basong Lake was generally low. However, the degree of humification was relatively higher at the sampling sites with human disturbances. In accordance with the UV results, GC-MS analysis revealed that the humic and fulvic acid in the surface sediments from the lake consisted mainly of aromatic compounds, which were associated with aromatic ring and fatty chain, unsaturated hydrocarbons, methyl, methylene, isopropyl, cyclopropane, hexane and naphthalene groups. The molecular formula of highly matched structure was C15H24 with a molecular weight of 204, which were inferred to be tryptophan like.
李清清, 陈虎林, 罗珍, 仁增拉姆, 黄香. 巴松措表层沉积物中腐殖酸与富里酸的特性[J]. 中国环境科学, 2020, 40(9): 4039-4047.
LI Qing-qing, CHEN Hu-lin, LUO Zhen, RENZENG LaMu, HUANG Xiang. Characterization of humic and fulvic acid in the surface sediments from Basong Lake in Tibet. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(9): 4039-4047.
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