FOSS Kjeltec 8400全自动凯式定氮仪测定土壤全氮方法探讨  

FOSS Kjeltec 8400 Automatic Kjeldahl Nitrogen Determinator for Determination of Total Nitrogen in Soil

作　　者：高飞 陈素贤 杜晓玉 周欣 王熹 GAO Fei;CHEN Suxian;DU Xiaoyu;ZHOU Xin;WANG Xi(Beijing Cultivated Land Construction and Protection Center,Beijing 100101,China)

机构地区：[1]北京市耕地建设保护中心,北京100101

出　　处：《天津农业科学》2022年第9期76-80,共5页Tianjin Agricultural Sciences

摘　　要：为探讨全自动凯式定氮仪测定土壤全氮的方法,选择未知养分含量的耕层土样和标准土样,分别用半微量开氏法和FOSS Kjeltec 8400全自动凯氏定氮仪法测定土壤全氮含量,比较2种方法测定结果的可比性和大批量测试样品的可行性。在测定过程中,每个土壤样品每种方法重复测定3次,对测定结果进行精确度和准确度分析。结果表明:半微量开氏法和FOSS Kjeltec 8400全自动凯氏定氮仪测法定的耕层土样全氮含量分别为(0.162 8±0.097 6)%,(0.162 2±0.098 4)%,标准土样全氮含量分别为(0.100 4±0.045 2)%,(0.100 0±0.044 9)%。配对样品t检验结果表明:2种方法测定结果无显著差异,且2种方法测定的土壤全氮结果精确度和准确度均较高,稳定性较好,相对标准偏差均小于5%,能够满足试验结果需求。研究结果可为采用FOSS Kjeltec 8400全自动凯氏定氮仪测定土壤全氮提供参考。In order to explore the method of determining soil total nitrogen by Automatic Kjeldahl nitrogen meter, the cultivated soil samples and standard soil samples with unknown nutrient content were selected to determine soil total nitrogen content by semi micro Kjeldahl method and FOSS Kjeltec 8400 Automatic Kjeldahl nitrogen meter respectively, so as to compare the comparability of the results of the two methods and the feasibility of large-scale test samples. In the process of determination, each method of each soil sample was repeated for 3 times, and the accuracy and accuracy of the determination results were analyzed. The results showed that the total nitrogen content of cultivated soil samples measured by semi micro Kjeldahl method and FOSS Kjeltec 8400 Automatic Kjeldahl nitrogen analyzer was(0.162 8 ±0.097 6)% and(0.162 2 ±0.098 4)% respectively, and the total nitrogen content of standard soil samples was(0.100 4±0.045 2)% and(0.100 0±0.044 9)% respectively. The paired sample t-test results showed that there was no significant difference between the two methods, and the precision and accuracy of the two methods were higher, the stability was better,and the relative standard deviation was less than 5%, which met the needs of the experimental results. The results of this study can provide a reference for the determination of soil total nitrogen by FOSS Kjeltec 8400 Automatic Kjeldahl nitrogen analyzer.

关 键 词：土壤全氮 全自动凯氏定氮仪 半微量开氏法 

分 类 号：S153.6[农业科学—土壤学]