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1引言近20年来，石油类物质对环境的影响引起人们的高度重视，被列为环境优先控制污染物。迄今土壤中的油尚无令人满意的分析方法，已有的方法其不足之处在于抽提时间长，试剂用量多，有的提取效率较低。本人研究的用超声波抽提．紫外分光光度法测定，对以上不足之处有较大的改
1 Introduction The impact of petroleum on the environment has drawn great attention in recent 20 years and has been listed as a priority for environmental control of pollutants. So far, there is no satisfactory analytical method for oil in soils. The disadvantages of the existing methods are as follows: the extraction time is long, the amount of reagents is more, and the extraction efficiency is lower. I study the use of ultrasonic extraction. UV spectrophotometry, the above deficiencies have a greater change