DIN EN ISO 8968-4:2016-09
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)氮含量的測定及真實蛋白質(zhì)含量計算(參考方法)
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) (ISO 8968-4:2016); German version EN ISO 8968-4:2016