DIN EN ISO 20541:2008
奶和奶制品.硝酸盐含量的测定.酶还原反应和Griess反应后分子吸收光谱法(ISO 20541-2008).德文版本EN ISO 20541-2008
Milk and milk products - Determination of nitrate content - Method by enzymatic reduction and molecular-absorption spectrometry after Griess reaction (ISO 20541:2008); German version EN ISO 20541:2008