含油污泥中油水含量的3种测定方法比较

Comparison of three kinds of determination methods on oil and water content of oily sludge

利用索氏提取-减量法、减量法和自行开发的高效抽提法,对一系列已知组成的含油污泥进行了油、水含量的测定。测定结果表明,高效抽提法在油、水含量的测定精度方面优于其他2种方法,对于不同组成的含油污泥,由其测定的油含量与含油污泥样品实际油含量的相对偏差均小于5%,由其测定的水含量与含油污泥样品实际水含量的相对偏差均小于7%。在测定效率方面,高效抽提法也优于其他2种方法,40 min即可完成10 g油-水-固质量比为3∶2∶5含油污泥中油、水含量的测定。

The contents of oil and water in a serious of oily sludge sample with known compositions were determined by three kinds of method, i.e. Soxhlet extractive-decrement method, decrement method and highly efficient extractive method. The determining results demonstrated that the measuring accuracy of highly efficient extractive method were better than that of other methods. mined by highly efficient extractive method and the real The relative deviation between the oil contents deter- values were less than 5% for known composition oily sludge, and the relative deviation for water contents were less than 7%. For the extractive efficiency, the highly efficient extractive method could extract more oil from oily sludge than that of Soxhlet extractive-decrement meth- od during the same time. The highly efficient extractive method could extract almost all the oil in oily sludge sam- ple in which the mass ratio of oil, moisture and solid was 3： 2：5 when the extraction time was 40 minutes.