New deployment of the rapid analysis of organic matter in sediments by the TMAH-GC-MS method

(1)由于离线-TMAH（四甲基氢氧化铵）-GCMS方法比在线-TMAH-GCMS更适合于分析植物和沉积物中的木质素，因此考察了反应条件。结果表明，反应温度为300℃，反应时间为30 min是最适宜的反应条件。(2)采集了约100种针叶树、阔叶树和草本植物的花粉、叶片、枝条和树脂，用TMAH-GCMS方法进行了有机质分析。植物各部位的脂肪酸、木质素酚类和角质酸组成的差异和特点已比较清楚。(3)通过对贝加尔湖沉积物和周边湿地土壤中有机质的分析，研究了贝加尔湖湿地植被的变化。结果表明，花粉分析结果与木质素酚类、脂肪酸和角质酸有机质组成的多元分析结果在植被期划分上是一致的。(4)建立了各化合物的质谱与花粉、叶片、枝条和树脂有机质组成的数据库。植物系统分析数据库对有机地球化学研究具有重要意义。

(1) Since an Offline-TMAH (tetramethylammonium hydoxide)-GCMS method was more suitable than online-TMAH-GCMS for analysis of lignin in plants and sediments, the reaction conditions were examined. As a result, the reaction condition is the most suitable at 300℃ for 30 minutes.(2) Pollens, leaves, braches and resins of about 100 species of conifers, broad leaf trees and herbaceous plants were collected, and organic matter analysis by the TMAH-GCMS method was conducted. The difference and features between the compositions of fatty acids, lignin phenols and cutin acids in each parts of plants vegetable part, lignin and cutin acids have become clear.(3) Changes of vegetations were examined by the organic matter analyses in the Lake Baikal sediment and peripheral wetland soils. As a result, it has turned out that the results of the pollen-analyses and the multivariate-analyses of organic matter compositions of lignin phenols, fatty acids and cutin acids correspond in the divisions into periods of vegetation.(4) The data base was constructed that mass spectra of each compound is linked with organic matter compositions of pollens, leaves, braches and resins. The data base from systematic analyses of plants has a significant meaning for organic geochemistry.