Abstract：This paper reports the determination of three nitrogen states in plants: nitric nitrogen, ammoniacal nitrogen and total nitrogen. The plant sample was digested by the Kjeldathl method with H2SO4+H2O2. The solution of the sample was determined by three methods: absorption photometric method, indigotic colorimetry，and UV absorption photometric method after K2S2O8 oxidation. By comparing the results, the relationship among the three N states is that the total N= NH+4+NO-3. Suitable methods were found for the determination of the elements, thus providing a scientific basis for the selection of suitable methods for chemical element analysis in plants.
吕伟仙1，葛 滢1，吴建之2，常 杰1* . 植物中硝态氮、氨态氮、总氮测定方法的比较研究 [J]. 光谱学与光谱分析, 2004, 24(02): 204-206.
Lü Wei-xian1，GE Ying1，WU Jian-zhi2，CHANG Jie1* . Study on the Method for the Determination of Nitric Nitrogen, Ammoniacal Nitrogen and Total Nitrogen in Plant . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(02): 204-206.
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