气相色谱法测定苯中噻吩及其灵敏度调控

Determination of thiophene in benzene by gas chromatography and its sensitivity regulation

苯中噻吩含量的测定一般采用传统的分光光度法,但该方法分析过程时间长且精度低,无法保证检测数据的准确性。提出了采用配有火焰光度检测器(FPD)的气相色谱来检测苯中噻吩的含量,通过调整柱箱温度、检测压力、进样量及分流比等检测参数来调控检测器的灵敏度,噻吩最低检测质量分数可达10×10^(-9)级别。实验结果表明:与传统的检测方法相比,该方法具有操作简单、检测快速、灵敏度高、干扰少、测定结果重复性好等优点,分析结果更加准确可靠。

The traditional spectrophotometry was generally adopted for determination of thiophene content in benzene,but this method had a long analysis process and low accuracy,which could not guarantee the accuracy of the detection data.It was proposed to use gas chromatography equipped with a flame photometric detector(FPD)to detect the content of thiophene in benzene,and the sensitivity of the detector could be adjusted by adjusting detection parameters,such as column temperature,detection pressure,injection volume and split ratio.The minimum detection concentration of thiophene could reach the level of 10×10^(-9).Compared with the traditional detection method,it had the advantages of simple operation,fast detection,high sensitivity,less interference and good repeatability of measurement results,making the analysis results more accurate and reliable.