以三氯甲烷作为提取剂抽提土壤中的石油类物质时，最佳超声提取条件是：超声波功率为２５Ｗ，室温下超声提取１５ｍｉｎ，每个样品提取２次，每次加入提取剂２０ｍＬ。将提取物中的溶剂蒸发后，用石油醚溶解残余物，再用紫外分光光度法进行测定。该方法的线性范围宽，精密度和准确度好，相对标准偏差为１８０％，加标回收率为９５３％，最低检出限为０．００３ｍｇ／ｇ。 When using trichloromethane as extractant to extract petroleum in soil, the optimal conditions for ultrasonic extraction were as follows: ultrasonic power 25W, ultrasonic extraction 15min at room temperature, extraction 2 times for each sample, 20mL extractant each time. After the solvent in the extract was evaporated, the residue was dissolved in petroleum ether and then determined by UV spectrophotometry. The method has wide linear range, good precision and accuracy with relative standard deviation of 180%, spiked recoveries of 953% and minimum detectable limit of 0.003 mg / g.