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利用瑞典tecator凯氏定氮仪系统以CuSO4·5H2O－K2SO4-H2SO4消解法测定样品中氮含量时，实验表明，催化剂中不加K2SO4，只加入少量CuSO4·5H2O对按原定步骤测定时，所得结果与原传统方法中以K2SO4·CuSO4·5H2O对按一定比例混合后测得结果无明显差异。分别对土壤、饲料、谷物等样品进行了实验，得到了同样的效果。对其产生的原因本文亦进行了探讨。
When the content of nitrogen in the sample was determined by the digestion method of CuSO4 · 5H2O-K2SO4-H2SO4 using the Swedish tecator Kjeldahl apparatus, the experiment showed that there was no K2SO4 addition in the catalyst, only a small amount of CuSO4 · 5H2O was added to the sample, The results with the original traditional method to K2SO4 · CuSO4 · 5H2O pairs according to a certain percentage of mixed results measured no significant difference. Experiments were carried out on soil, feed, grain and other samples, respectively, and the same result was obtained. This article also discussed the reasons for its occurrence.