全自动凯氏定氮仪测定有机肥中总氮含量  

Determination of Total Nitrogen in Organic Fertilizer by Automatic Kjeldahl Nitrogen Analyzer

作　　者：冯敏铃 刘铭扬 李盛安 黄宝荣 FENG Min-ling;LIU Ming-yang;LI Sheng-an(Zhongshan Agricultural Products Quality and Safety Inspection Institute,Zhongshan,Guangdong 528403;Zhongshan Agricultural Science and Technology Extension Center,Zhongshan,Guangdong 528403)

机构地区：[1]中山市农产品质量安全检验所,广东中山528403 [2]中山市农业科技推广中心土肥站,广东中山528403

出　　处：《安徽农业科学》2022年第8期169-170,186,共3页Journal of Anhui Agricultural Sciences

基　　金：中山市社会公益科技研究项目(2019B2022,2019B2024)。

摘　　要：[目的]建立全自动凯氏定氮仪测定有机肥中总氮含量的方法。[方法]有机肥加入浓硫酸和催化剂(4.5 g K_(2)SO_(4)+0.5 g CuSO_(4)·5H_(2)O)在凯道森高效消化系统消解,用全自动凯氏定氮仪进行测定,能简单高效地测定有机肥中总氮含量。[结果]该方法与国家标准GB/T 17767.1—2008、行业标准NY/T 525—2021进行样品试验比对,检测结果并无明显差异;与相关标准比较检测时间缩短,且能进行大批量样品检测。[结论]该方法适合于基层肥料检测技术人员操作使用。[Objective]To establish a method for the determination of total nitrogen in organic fertilizer by Automatic Kjeldahl nitrogen analyzer.[Method]Organic fertilizer was digested by adding concentrated sulfuric acid and catalyst(4.5 g K_(2)SO_(4)+0.5 g CuSO_(4)·5H_(2)O)in the high efficiency digestion system of kadawson.The total nitrogen content in organic fertilizer could be determined simply and efficiently by Automatic Kjeldahl nitrogen analyzer.[Result]Compared with the national standard GB/T 17767.1-2008 and the industry standard NY/T 525-2021,the results showed no significant difference.Compared with the relevant standards,the detection time was shortened,and it could be used to detect a large number of samples.[Conclusion]This method is suitable for grass-roots fertilizer testing technicians.

关 键 词：全自动凯氏定氮仪 有机肥 总氮 含量测定 

分 类 号：TQ440.22[化学工程—化学肥料工业]