【摘要】 植物样品经硫酸 +过氧化氢凯氏法消煮后 ,分别用直接吸光光度法、靛酚蓝比色法、过硫酸钾氧化吸光光度法获得硝态氮 (包括亚硝态氮 )、氨态氮、总氮的含量。通过样品测试数据的比较 ,证明分别测得的氨态氮、硝态氮含量之和与所测总氮结果一致。本文为植物生态学和植物学中氮元素各种形态含量的分析提供了选择测定方法的依据更多还原

【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 H 2SO 4+H 2O 2. The solution of the sample was determined by three methods: absorption photometric method, indigotic colorimetry, and UV absorption photometric method after K 2S 2O 8 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.更多还原