Analysis of Aliphatic Hydrocarbon Compositions in a Lake Sediment

• Main Authors: Shin-Dain Liu, 劉欣典
• Other Authors: Cheng-Wei Fan
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/94356669975837507896

碩士 === 國立中正大學 === 應用地球物理研究所 === 99 === A 14-m sediment core was collected from the center of Tung-Yuan Pond, southern Taiwan, in 2004 to provide useful information to paleoenvironmental reconstruction. Twenty-eight samples from the sediment core were analyzed for aliphatic hydrocarbons (AHCs, C10-C35 n-alkanes) and the unresolved complex mixture (UCM) of hydrocarbons. The average concentration of the total AHCs was 48.1±39.3 μg/g (ranged 2.2~166.3 μg/g). Of the total AHCs, 63.48±10.87% was consist of C27、C29、C31 and C33, primarily dominated by C31 and C29. The predominance of odd carbon numbers suggests the contribution from terrestrial origin. UCM were also detected in all samples. Concentrations of the UCM averaged 32.5±19.4 μg/g (ranged 4.1~80.4 μg/g). Biomarker proxies calculated from the analysis results include CPIC24-C34(3.05~7.89)、U/R ratio (0.1~4.9)、Paq value(0.06~0.23)、C31/(C27+C29)ratio(0.25~1.89) and TAR value(0.8~77.62). We classified and concluded the environment and climate of Tung-Yuan Pond to seven different types during the past 14000 years. These AHCs and UCM concentrations and biomarker proxies calculated obtained from Tung-Yuan Pond sediment core can be useful in paleoclimate studies, and lead to better understanding in the organic geochemistry in Taiwan.