GSO ISO 8968-4:2021 乳和乳制品 氮含量的測定 第4部分:蛋白質(zhì)和非蛋白質(zhì)氮含量的測定及真蛋白質(zhì)含量計算(參考法)
Milk and milk products — Determination of nitrogen content — Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method)