Determination of a Small Amount of Crude Oil in Soli Using Tetrahadrofuran-Turbidimetric Method
四氢呋喃比浊法测定土壤中的微量油

In this report, the authors intended to find out a method for determining a small amount of crude oil in soil. First oil is extracted from soil by tetrahydrofuran, then subjected to centrifugal settling. And the supernatant is pipetted for determining the content of crude oil by turbidimetry.The method is limited to an amount of oil 0.025mg in a 10g sample. It gives extraction yield about 98%. Compared with the gravimetric analysis, the method is simple and speedy with high yield. The determination of a sample shows that standard deviation of the method is 0.036 and coefficient variation 0.035. Therefore it can be satisfactory to determine a small amount of crude oil containing in soil.