复混肥料中氧化钾含量测定的不确定度评定  

Evaluation the Uncertainty of Measurement of Potassium Oxide Content in Compound Fertilizer

作　　者：廉翔 Lian Xiang(Shanxi Research Institute of Applied Chemistry Shanxi Quality Supervision and Inspection Station of Fertilizer and Pesticide Product,Taiyuan Shanxi 030027)

机构地区：[1]山西省应用化学研究所山西省化肥农药产品质量监督检验站,山西太原030027

出　　处：《山西化工》2022年第7期57-58,共2页Shanxi Chemical Industry

摘　　要：用四苯硼酸钾重量法测定复混肥料中氧化钾含量并建立数学模型,通过分析测定过程中的影响因素,对氧化钾含量的测定结果进行不确定度评定。结果表明,不确定度的主要来源有样品称量、定容、移取等,最终计算得到测定结果的扩展不确定度U=0.056%,k=2。The potassium oxide content in compound fertilizer was measured by potassium tetraphenylborate gravimetric method and the mathematical model was established.The uncertainty of measured results was evaluated by analyzing the influencing factors in the determination process.There are several important sources of the uncertainty of measurement results,such as sample weighing,constant volume and pipetting,etc.The expanded uncertainty of measurement results were as follows:U=0.056%,k=2.

关 键 词：不确定度 氧化钾 复混肥料 

分 类 号：O652[理学—分析化学]