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中国农学通报 ›› 2014, Vol. 30 ›› Issue (6): 159-162.doi: 10.11924/j.issn.1000-6850.2013-0506

• 农学 农业基础科学 • 上一篇    下一篇

测定植物全氮的H2SO4-H2O2消煮法改进

李朝英 郑路 卢立华 李丽利   

  • 收稿日期:2013-02-27 修回日期:2013-04-19 出版日期:2014-02-25 发布日期:2014-02-25
  • 基金资助:
    中央级公益性科研院所基本科研业务费专项资金 “基于经营班尺度的森林立地分类与评价” (CAFYBB2012001)。

Improvement in the H2SO4-H2O2 Digestion Method for Determining Plant Total Nitrogen

  • Received:2013-02-27 Revised:2013-04-19 Online:2014-02-25 Published:2014-02-25

摘要: 为了快速准确测定批量植物全氮,提高检测效率,对测定植物全氮的H2SO4-H2O2消煮法提出改进。通过反复实验,摸索出在消煮过程只加1次H2O2的改进方法。结果表明,改进方法测定氮含量的变异系数(CV)小于5%,回收率在95%~105%之间。与原H2SO4-H2O2消煮法相比,节约用时50~80 min/批样,减少H2O2消耗0.38~0.68 mL/样,检测结果无显著性差异。改进方法的精密度及准确性符合检测分析要求,同时缩短了植物全氮检测用时,H2O2耗用量相对较少,效率明显提升,适宜批量植物全氮的检测。

关键词: 去除率, 去除率

Abstract: In order to determinate quickly and accurately, and improve the determining efficiency, H2SO4-H2O2 digestion method for determining plant total nitrogen was improved. H2O2 was added only once in digestion process. The coefficient of variation (CV) of the improved method was less than 5%. The recoveries were in the range of 95%-105%. The time of improved method was less 50-80 min than that of the original H2SO4-H2O2 digestion method. H2O2 consumption was saved 0.38 -0.68 mL per sample. Detection results were no significant difference between the two methods. Precision and accuracy met the requirement of detection analysis. The improved method was recommended as digestion method for rapid determining batch plant total nitrogen.