| 沉积岩总有机质碳同位素分析的前处理影响 |
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| 关键词:sedimentary rock organic carbon isotope sample-pretreatment condition test |
| 基金项目:国家自然科学基金项目(编号:40572098)，中石化海相油气前瞻性项目(编号:G0800-06-ZS-319) |
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| 摘要: |
| Sample-pretreatment Effects on Analytical Results of Total Organic Carbon Isotopes in Sedimentary Rocks |
| The carbon isotopic composition of sedimentary rocks has been widely used in geochemistry to reconstruct paleoenvironment and ancient vegetation,but insufficient systematic research has been made on the pretreatment of sedimentary rock samples.The dissimilarity of rock sample pretreatment methods affects the measurement result of organic carbon isotope,and hence the information in the sample cannot be accurately reflected.This paper analyzed the factors affecting the pretreatment.① Effects of the diameter of particles on the δ13C value of organic matter, the sample crushed to 100 mesh could yield the right data, but the value of δ13C display a positive distribution when the sample crushed to 60 mesh. When limestone is crushed to 200 mesh, the value of δ13C display a positive distribution. ②Effects of acid concentration on the δ13C values of organic matter; the addition of different concentrations of hydrochloric acid and 15% hydrochloric acid to the samples will not affect the experimental result. Nevertheless, due to impurities in acid, the value of δ13C will display a negative distribution. ③ Effects of the washing out of the residual acid and the drying temperature on the δ13C values of organic matter; in order to avoid losing organic matter in the sample, the washing out of the residual acid is not proper. Nevertheless, because of the residual acid in the samples, the values of δ13C display a negative distribution and this may damage the instrument. At the drying teperature of 100℃, some organic matter may be lost, causing a relatively positive distribution of the δ13C values. |
| WU Xia,HUANG Jun-hua,BAI Xiao,WANG You-zhen.2008.Sample-pretreatment Effects on Analytical Results of Total Organic Carbon Isotopes in Sedimentary Rocks[J].Acta Geoscientica Sinica,29(6):677-683. |
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