Benzene is the main raw material for the production of styrene, benzene thiophene concentration of the general requirements of less than 0.6mg / kg. At present the national standard is used in chemical analysis, gas chromatography and mass spectrometry and other methods.

          The specifications of HH-SF-IV thiophene special column (specification: 3m * 3mm) were developed and analyzed by gas chromatograph with flame photometric detector (FPD). And the recovery rate is 95%. This method has the characteristics of fastness, sensitivity, good reproducibility, high accuracy and small pollution.