GB/T 40897-2021 《Determination of alkali sulfides and alkaline earth sulfides in cosmetics—Methylene blue spectrophotometric method》 Related products

This standard specifies the use of Methylene Blue Spectrophotometric method, spec-trophotometry method for the determination of alkali metal sulfides and alkaline earth metal sulfides in cosmetics. It is suitable for water, cream and emulsion hair removal cosmetics. The detection limit of the method is 3 mg/kg, and the quantification limit is 10 mg/kg. Hydrogen sulfide gas is generated through the acidification reaction of sulfides, and the generated Methylene Blue Absorbance is derived and determined by nitrogen gas flow. This standard provides a technical basis for ensuring the accurate detection of alkali metal and alkaline earth metal sulfide content in cosmetics, ensuring the mass and safety of products.