复合肥料中总氮含量的测定方法探讨

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【摘要】通过凯氏定氮法对复合肥料进行精密度试验和加标回收率试验，将复合肥料中总氮含量测定结果与蒸馏后滴定法（仲裁法）测定结果进行比较。实验表明，凯氏定氮法操作简单、耗时少、节约试验成本，并且准确率和重复率高，数据准确可靠。

【关键词】复合肥料；凯氏定氮法；加标回收率；精密度；总氮含量；因素分析

【DOI编码】10.3969/j.issn.1674-4977.2024.03.007

Discussion on the Determination Method of Total Nitrogen Content in Compound Fertilizers

ZHOU Chao， LI Daibing

（Qiannan Prefecture Inspection and Testing Center， Xingyi 562400， China）

Abstract： The precision test and spiked recovery rate test were conducted on composite fertilizers using the Kjeldahl nitrogen determination method. The results of the total nitrogen content determination in composite fertilizers were compared with those of the titration method （arbitration method） after distillation. The experiment showed that the Kjeldahl nitrogen determination method was simple to operate， time-consuming， cost-effective， with high accuracy and repeatability， and the data was accurate and reliable.

Keywords： compound fertilizer； kjeldahl nitrogen determination method； recovery rate of spiking； precision； total nitrogen content； factor analysis

氮是植物生长的重要营养元素之一，对农作物的产量和品质有重要影响。（剩余4000字）