凯氏定氮法相关的选择性氮测定方法
全自动凯氏定氮仪/自动凯氏定氮进样器 K-375 / K-376、凯氏消解仪 K-449、尾气吸收仪 K-415
世界上 85% 的肥料需氮量主要来自尿素、硝酸铵、磷酸盐和硫酸盐等各种形式的氨。在土壤、污泥和生物废弃物中也可以发现氨成分。在这些样品基质中,可以找到几种含氮化合物的混合物,如尿素、来自其他有机来源的氮,如氨基酸、蛋白质、硝酸盐、亚硝酸盐和铵。使用凯氏定氮设备,可以选择性测定样品的总凯氏氮(TKN 和 TKN+)、铵盐(铵蒸馏)和硝态氮浓度(Devarda 蒸馏)。此外,根据这些参数还可以计算有机氮含量。
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Nitrogen and Protein Determination in Animal Feed according to the Kjeldahl method
The determination of protein in feed is a routine procedure for quality assurance and labelling. A simple and fast method for protein determination in feed products according to the ISO 5983-2:2009 and AOAC 954.01 regulations is introduced below. The sample is digested with sulfuric acid and Kjeldahl Tablets Titanium using the digest Automat K-438, followed by distillation and titration with the KjelMaster K-375 with KjelSampler K-376.