提出植物样经 H2 SO4 +H2 O2 凯氏消煮 ,试液中和后用过硫酸钾碱性溶液氧化 ,在酸性条件下用紫外吸光光度法测定包括铵态氮、硝态氮及亚硝态氮的总氮含量。对植物标准物质GBW0 760 3作平行试验 ,分析结果与标准值的相对误差为 4.7% ;方法的相对标准偏差为 3.3%。用该法作了批量分析 ,操作简便 ,数据可靠 The plant samples were digested by H2 SO4 + H2 O2, and the solution was neutralized with potassium persulfate and then oxidized with alkaline solution. Under acidic conditions, the contents of ammonium nitrogen, nitrate nitrogen and nitrite Total nitrogen content of nitrogen. The plant standard material GBW0 760 3 was tested in parallel. The relative error between the analytical result and the standard value was 4.7%. The relative standard deviation of the method was 3.3%. Made with the method of batch analysis, easy to operate, reliable data