Analysis Solution - Determination of Total Sulfur and Sulfur Dioxide in Food Grade CO2

1、 Method Overview:

This method determines the total sulfur content according to the total sulfur method in Appendix A of GB/T 28727-2012. Using the principle of ten way valve injection and back blowing, the total sulfur content data is obtained on the FPD flame photometric detector. At the same time, the injection function of the ten way valve was utilized to determine the sulfur dioxide content in food grade high-purity carbon dioxide.

When measuring total sulfur, the ten way valve is reset and the chromatographic column in the gas flow path is in a backflush state. When measuring sulfur dioxide, there is no need for blowback, as long as the ten way valve is reset after the sulfur dioxide flows out and the analysis is completed.

This method meets the detection requirements for total sulfur S and sulfur dioxide SO2 in the national food safety standard GB1886.228-2016 Food Additive Carbon Dioxide

2、 Experimental instruments, equipment, and standards:

G51 (FPD) gas chromatograph; Automatic ten way valve (quantitative ring 1ml)

Standard sample: SO2/5ppm, bottom gas N2;

N2 purity>99.999%

752 standard air valve

Air: Oil free air generator (XGA-380A)

Hydrogen: High purity hydrogen generator (XGH-300)

100ml all glass syringe

Needle No. 5

Small rubber cap