河南农业科学 ›› 2024, Vol. 53 ›› Issue (2): 85-91.DOI: 10.15933/j.cnki.1004-3268.2024.02.009

• 农业资源与环境 • 上一篇    下一篇

杜马斯燃烧法与凯氏定氮法在肥料总氮测定中的比较

贾斌1,2,尚丽君1,潘洁1,孙红梅1,王颖1,原二玎3
  

  1. (1.河南省农业科学院农业质量标准与检测技术研究所,河南 郑州 450002;2. 农业农村部农产品质量安全风险评估实验室,河南 郑州 450002;3. 温县产品质量检验检测中心,河南 温县 454850)
  • 收稿日期:2023-09-11 出版日期:2024-02-15 发布日期:2024-03-19
  • 作者简介:贾斌(1972-),男,黑龙江望奎人,副研究员,主要从事农产品质量安全研究。E-mail:jiabin854@163.com
  • 基金资助:
    河南省科技攻关项目(232102110165);中原科技创新领军人才项目(234200510012);河南省农业科学院自主创新基金资助
    项目(2023ZC074,2023ZC129)

Comparison of Dumas Combustion Method and Kjeldahl Nitrogen Determination Method in Determination of Total Nitrogen in Fertilizer

JIA Bin1,2,SHANG Lijun1,PAN Jie1,SUN Hongmei1,WANG Ying1,YUAN Erding3   

  1. (1. Institute of Agricultural Standards and Testing Technology,Henan Academy of Agriculture Sciences,Zhengzhou
    450002,China;2. Laboratory of Quality & Safety Risk Assessment for Agro⁃Products,Ministry of Agriculture and Rural
    Affairs,Zhengzhou 450002,China;3. Wenxian County Product Quality Inspection and Testing Center,Wenxian 454850,
    China)
  • Received:2023-09-11 Published:2024-02-15 Online:2024-03-19

摘要: 为评价杜马斯燃烧法与凯氏定氮法测定不同类型肥料总氮含量的适用性,选用20种不同类型的含氮肥料和4种标准品作为试验对象,分别采用杜马斯燃烧法和凯氏定氮法进行总氮含量测定,并对2种方法测定结果的精密度、准确度、相关性及优缺点进行比较。结果表明,2种方法在测定不含硝态氮肥料时,测定结果没有显著性差异,但杜马斯燃烧法测定结果的精密度更高;在测定含硝态氮肥料时,2种方法测定结果差异显著,杜马斯燃烧法测定结果更接近真实含量,且重复性良好,凯氏定氮法的测定值偏低,且重复性较差;对于氮含量较高的尿素氮肥,凯氏定氮法测定结果精密度略高于杜马斯燃烧法。结合环境友好度、工作效率、试验成本及测定结果的精密度和准确度等因素,杜马斯燃烧法更适用于肥料总氮含量的测定。

关键词: 肥料, 总氮含量, 硝态氮, 杜马斯燃烧法, 凯氏定氮法

Abstract: To evaluate the applicability of Dumas combustion method and Kjeldahl nitrogen determination method in determining the total nitrogen content of different types of fertilizers,20 different types of nitrogen⁃containing fertilizers and 4 standard samples were selected as experimental objects.Dumas combustion method and Kjeldahl nitrogen determination method were used to determine the total nitrogen content,and the precision,accuracy,correlation of the results,and advantages and disadvantages of the two methods were compared.The results showed that there was no significant difference between the two methods in determining fertilizers without nitrate nitrogen,but the precision of Dumas combustion method was higher.When measuring nitrate nitrogen⁃containing fertilizers,there was a significant difference in the results of the two methods.The results of Dumas combustion method were closer to the true content and had good repeatability,while Kjeldahl nitrogen determination method had a lower value and poor repeatability.For urea nitrogen fertilizers with high nitrogen content,the precision of Kjeldahl nitrogen determination method was slightly higher than that of Dumas combustion method.Taking into account factors such as environmental friendliness,work efficiency,experimental costs,precision and accuracy of the measurement results,Dumas combustion method is more suitable for determining the total nitrogen content of fertilizers.

Key words: Fertilizer, Total nitrogen content, Nitrate nitrogen, Dumas combustion method, Kjeldahl nitrogen determination method

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