NS-EN ISO 8968-4:2016
乳和乳制品 氮含量的测定 第4部分:蛋白质和非蛋白质氮含量的测定及真实蛋白质含量计算(参考方法)(ISO 8968-4:2016)
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)