The main difference between the old and new product standards is the addition of some analysis of the impurity components, especially in the case of GB / T 3405-2011, which has been introduced since October 2011. GB / T 3405-1989, The total sulfur content on the basis of the increase in thiophene project analysis, and some high-end customers for thiophene indicators have higher requirements, its content should not be greater than 0.10 mg / kg.

     The HH-SF-I packed column for the determination of trace thiophene in petroleum benzene was developed by using the ultra-high sensitivity gas chromatograph and external standard method. The determination of trace thiophene in petroleum benzene was carried out. Determine the burner operating temperature, gas flow rate and other detector conditions, to find a solution to the interference. Compared with other detection methods, it has the advantages of simple operation, fast detection, high sensitivity, low detection limit, less interference and good reproducibility of measurement results. The results are more accurate and reliable.