ISO 9231|IDF 139:2008 specifies a method for the determination of the benzoic and sorbic acid contents in milk and milk products. The method is applicable to milk, dried milk, yogurt and other fermented milks, and cheese and processed cheese, and is suitable for measuring the contents of both compounds at levels of more than 5 mg/kg.
GSO ISO 9231:2021 history
2021GSO ISO 9231:2021 Milk and milk products — Determination of the benzoic and sorbic acid contents