Research on Accurate Measurement of Potassium Content in Fertilizer Reference Materials
WANG Zhao1,SHI Nai-jie2,Mukram Abliz3
1.Suzhou Institute of Measurement and Testing, Suzhou, Jiangsu 215128, China
2.National Institute of Metrology, Beijing 100029, China
3.Xinjiang Uygur Autonomous Region Research Institute of Measurement and Testing, Urumqi, Xinjiang 830011, China
Abstract：A method combined with potassium tetraphenylborate gravimetric analysis and ion chromatography is adopted to measure the content of potassium in potassium sulphate which is one of the fertilizer reference materials. The content of sodium in the precipitate and the content of potassium in the residues and filtrates are measured by ion chromatography. The effects of the gravimetric method are analyzed including buoyancy correction, insolubles, residues, filtrates and sodium content contained in the precipitation. Updated by the analysis, the influencing factors are reduced to the minimum. The reference material of potassium sulfate is reproduced and measured with this method. The potassium content is 44.69%, the expanded uncertainty is 0.17%(k=2)and the uniformity and stability are both met the requirement. And its traceability is guaranteed.
王钊,史乃捷,穆克然木·阿布利孜. 化肥标准物质中钾含量准确定值方法研究[J]. 计量学报, 2018, 39(3): 425-430.
WANG Zhao,SHI Nai-jie,Mukram Abliz. Research on Accurate Measurement of Potassium Content in Fertilizer Reference Materials. Acta Metrologica Sinica, 2018, 39(3): 425-430.
2018, Vol. 39 
