超声萃取-气相色谱法测定土壤中石油烃

Determination of Petroleum Hydrocarbons in Soil by GC Combined with Ultrasonic Extraction

摘要: 采用探头式超声波发生器萃取-气相色谱-火焰离子检测法（GC-FID）测定土壤中33种石油烃（C8~C40）。采用正交试验考察了萃取剂及其用量、超声时间和萃取次数等4个因素对土壤中石油烃的萃取效果的影响，得到最佳萃取条件为：10.00 g样品用30 mL二氯甲烷超声萃取10 min，萃取2次。33种石油烃的线性范围在500 mg·L^-1内，检出限（3s）为0.10~0.40 mg·L^-1。加标回收率为83.2%~106%，测定值的相对标准偏差（n=7）为0.80%~5.5%。

Abstract: A method was established for the determination of 33 petroleum hydrocarbons from C8 to C40 in soil by gas chromatography with flame ion detector after ultrasonic extraction with a probe ultrasonic generator. The effect of extraction solvent and its dosage, ultrasonic time and extraction times on extraction efficiency for petroleum hydrocarbons in soil was investigated by orthogonal experiments, giving the optimized condition was as follow:10.00 g of sample was extracted ultrasonically with 30 mL of dichloromethane as extraction solvent for 10 min and 2 times. Linearity ranges of 33 petroleum hydrocarbons were within 500 mg·L^-1 and detection limits (3s) were 0.10-0.40 mg·L^-1. Recovery rates obtained by standard addition method were in the range of 83.2%-106% and RSDs (n=7) were in the range of 0.80%-5.5%.