加速溶剂萃取提取土壤中正构烷烃的方法研究

Study on Accelerated Solvent Extraction of n-alkanes in Soil Samples

建立了加速溶剂萃取技术提取-柱色谱分离-气相色谱分析土壤样品中正构烷烃的方法。优化了压力、温度、静态时间、循环次数等参数。随着温度、静态时间、循环次数和压力的增加，正构烷烃短碳链、长碳链和总正构烷烃的量逐渐增加。加速溶剂萃取提取土壤中正构烷烃的条件是：萃取温度150℃，萃取压力10．3MPa，循环2次，静态提取时间10min。加速溶剂萃取-柱色谱分离-气相色谱法测定土壤中正构烷烃的方法精密度（RSD）为8％-23％。加速溶剂萃取法提取总正构烷烃量、短碳链正构烷烃量显著高于索氏抽提法的提取量。

The paper described the determination of n-alkanes in soil samples by gas chromatography with accelerated solvent extraction （ASE） for sample pretreatment. The main factors which affect the extraction yield of n-alkanes by ASE, such as the temperature, pressure, static time and cycle times were discussed. The results showed that the optimum parameters for n-alkanes extraction from soil samples were： temperature of 150℃, pressure of 10.3 MPa, static time of 10 rain and 2 cycles. The precision of method was 8% to 23% RSD. The results also showed that the extraction efficiency of total n-alkanes and short carbon chain n-alkanes by ASE was superior to the conventional Soxhlet extraction.