基于核磁共振T2谱检测原油污染土壤含油率的实验研究

An Experimental Study on T2 Spectrum of NMR Method for Measuring Oil Content in Crude Oil Contaminated Soil

为了探索原油污染土壤含油率的核磁共振T2谱测定方法,配制了原油污染土壤样品,测量了原油污染土壤的核磁共振T2谱,分析了T2谱的特征以及横向弛豫时间和峰面积与含油率的关系,提出了一套核磁共振测量原油污染土壤含油率的方法。结果表明:原油污染土壤的T2谱具有多峰特征,污染土壤T2谱第2个峰的峰面积、各峰面积之和均随含油率的增大而增大;基于T2谱峰面积测量污染土壤含油率的相对误差小于5.0%。

In order to explore T2 spectrum of nuclear magnetic resonance(NMR)as a quick method for determination of oil content in crude oil contaminated soil,the samples of crude-oil-contaminated soil were prepared,and their T2 spectrums were measured.After analyzing the T2 spectrum characteristics and investigating the effect of oil content on transverse relaxation time and peak area,a NMR method for determination of oil content in crude-oil-contaminated soil was put forward.Research results showed that the T2 spectrum of crude-oil-contaminated soil had several peaks,peak area of the second peak and the sum of the peak areas in the T2 spectrum increased linearly with the increasing of oil content,and the maximal relative error was less than 5%when the second peak area of T2 spectrum was used to measure the oil content of crude-oil-contaminated soil.