尿基复合肥中总氮含量的快速测定

Rapid Determination of Total Nitrogen Content in Urea-Based Compound Fertilizers

用氯化钙作沉淀剂 ,先消除磷酸根离子的干扰 ,再用甲醛法测定复合肥中的总氮。该方法简便、快速、准确 ,加标回收率在 97.5 %～ 10 3.3% ,符合中控分析的要求。

Calcium Chloride is used as the precipitating agent, to eliminate the interference of the phosphate ions, and the total nitrogen content in the compound fertilizers is determined by the formaldehyde method. The method is convenient, rapid and accurate, and the marked recovery is 97.5%～103.3%.