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Study on the Composition and Source Characteristics of Pahokee Peat Humic Acid by Pyrolytic Technique

Li Li 1,2, Jia Wanglu 2, Peng Ping′an 2, Fu Jiamo 2, Sheng Guoying *2 1 (Key Laboratory of Marine Geology, Ministry of Education, Tongji University, Shanghai 200092) 2 (State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640)  
Pyrolysis-gas chromatogrpahy-mass spectrometric method and with in situ methylation were used for the study of the origin and composition characteristics of Pahokee peat humic acid. The results showed that aromatic compounds were the major pyrolysates in both pyrolytic techniques; while free fatty acids and aliphatic compounds were the minor pyrolysates. Other pyrolysates including some N-containing and furan-structure compounds were also detected. These indicated that Pahokee peat humic acid was mainly originated from plants, microorganisms and other sources inputs were also contributed to the formation of Pahokee peat humic acid. These pyrolysates and their sources analysis will provide important information for the structural composition and formation history of the Pahokee peat humic acid, and improve our knowledge of the humic acid.
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