This standard specifies the gas chromatography method for determination of free glycerin content in crude glycerin. This standard applies to crude glycerol, industrial-grade saponified glycerol and synthetic glycerol, which are biodiesel by-products with a mass fraction of less than 95%.
SN/T 3344-2012 history
2012SN/T 3344-2012 Determination of free glycerin in crude glycerin.Gas chromatography