气相色谱法测定洗油中萘及联苯含量

摘要

确立了使用气相色谱法(GC)定量测定洗油中萘及联苯的方法,该法以甲苯为溶剂,正十二烷为内标物,用内标法对萘及联苯含量进行测定；并采用气相色谱质谱联用法(GC/MS)对洗油化学成分定性分析,共鉴定出14个主要组分.结果表明,洗油中各组分能很好地分离,其中萘质量浓度平均为0.072 4g/mL,相对标准偏差( RSD)为0.70％～1.76％,加标回收率为95.46％～102.86％;联苯质量浓度平均为0.041 8g/mL,RSD为1.18％～3.83％,加标回收率95.19％～103.49％.%A gas chromatography(GC) method for the determination of naphthalene and biphenyl content in the washing oil was established. The internal standard method was adopted to determine the naphthalene and biphenyl content in the washing oil, using toluene as a solvent and normal dodecane as internal standard compound. A gas chromatography-mass spectrometry (CC/MS) was also used to analyze the main constituent in washing oil. The results showed that the composition in the washing oil could be well separated and fourteen compounds had been identified, in which, naphthalene had a mass concentration of 0.072 4g/mL, its RSD was 0.70%-1.76%, and its recovery was between 95.46%-102.86%. Biphenyl had a mass concentration of 0.041 8g/mL, its USD was 1.18% -3.83%, and its recovery was between 95.19%-103.49%. The method had good repeatability, precision and it is easy to be applied.