氮的测定法虽多,但归納起来,一般均不外于下列三种: 杜馬氏法(Duma’s method), 韋氏法(Will and Varentrap’s method),又称苏打石灰法, 凱氏法(Kjeldahl’s method)。中国药典上規定的氮测定法也屬于凱氏定氮法。本文預备对本方法的各項步驟加以必要的註釋。中国药典上氮测定法的原理大略如下:把含氮的有机質和濃硫酸一同加热破坏,使有机質中的碳和氢被濃硫酸氧化成二氧化碳和水而 Although there are many methods for determination of nitrogen, they are usually summarized as follows: Duma’s method and Will and Varentrap’s method, also known as soda lime method and Kjeldahl method Kjeldahl’s method). The Chinese Pharmacopoeia on the nitrogen determination also belongs to Kjeldahl method. This article is intended to annotate the various steps of this method as necessary. The principle of the Chinese Pharmacopoeia on the determination of nitrogen is as follows: The nitrogen-containing organic matter and concentrated sulfuric acid together with heating damage, so that organic matter in the carbon and hydrogen are concentrated sulfuric acid oxidation of carbon dioxide and water and