DIN EN ISO 20483:2014 谷物和豆類. 氮含量的測(cè)定和粗蛋白含量的計(jì)算. 凱氏定氮法(ISO 20483-2013); 德文版本EN ISO 20483-2013
Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2013); German version EN ISO 20483:2013