地质样品中有机物的超临界萃取研究

Study on Extraction of Organic Compounds in Geological Sample by Supereritical Extraction

建立了以 CO2 为超临界流体的超临界萃取地质样品中有机物的分析方法 ,讨论和优化了超临界萃取条件 ,测定了茂名油页岩中的 n- C13—n- C34 ,并与索式抽提结果作了对比。该方法测定茂名油页岩中的n- C15— n- C34 链烷烃 ,相对标准偏差为 ( n=4 ) 4.9— 2 3.8 ,n- C13的相对标准偏差为 9.2 % ( n=4 )。而传统经典的索式抽提法测得的 n- C15—n- C34 链烷烃的相对标准偏差为 11.2 %— 37.7% ( n=4 ) ,n- C13的相对标准偏差为 4 6.4 % ( n=4 )。本法与传统方法相比 ,具有高效、无热降解、无毒、选择性好、精密度好等优点 ,可直接用于 GC、GC-

Extracting organic compounds in geological sample by using supercritical fluid (SF)CO 2 were investigated.At 35MPa,1.0mL/min and 60℃ for 50min,the organic compounds in Maoming oil shale were extracted.The RSD(δ n,n =4)values of n \|C 13 ? 玭 \|C 34 are 4.9%—23.8%.It is greatly lower than this of SE(11.2%—46.7%).The selectivity is greatly higher than this of SE.SPE is promising technique for extracting organic compounds in geological sample because of simple,convenient and little pollution.