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用分光光度法测定５种中药及２种中药制剂中的总氮含量，并与凯氏定氮法比较，结果经ｔ检验，Ｐ＞０．０５，两种测定方法间无显著性差异。
Spectrophotometric method was used to determine the total nitrogen content in five kinds of traditional Chinese medicines and two kinds of traditional Chinese medicine preparations. Compared with Kjeldahl method, the results were analyzed by t-test, P>0.05. There was no significant difference between the two methods.