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众所周知,对于富含NO_3~-—N、NO_2~-—N 的土壤、肥料、污水以及其他样品,用K氏法测得的全氮值不能反映出NO_3~-—N、NO_2~-N 的含量,因此不能代表总氮量。虽然在此种情况下,可用测定样品中的全氮量和NO_3~-—N、NO_2~-—N 量的相加值来表示样品中的总氮量。但为使测定总氮量的工作简便快速起见,就需要一种能测定样品中所有
It is well-known that the total nitrogen value measured by K method can not reflect the contents of NO_3 ~ --N and NO_2 ~ -N in soils, fertilizers, sewage and other samples rich in NO_3 ~ --N, NO_2 ~ Content, it can not represent the total amount of nitrogen. In this case, the total nitrogen content in the sample can be expressed by the total nitrogen content in the sample and the added value of NO_3 ~ -N and NO_2 ~ -N. However, in order to make the determination of total nitrogen work simple and rapid, there is a need for a method that can determine all