微波加热技术应用于复混肥料中钾含量测定的研究

四苯硼钾重量法测定复混肥中钾含量过程中处理样品采用的普通电热板加热技术存在耗时耗能、不利于快速分析等缺点,将具有可以快速溶解试样和快速干燥特点的微波加热技术应用于复混肥中氧化钾含量的测定。实验结果表明,可以采用微波中高火5 min溶解试样的方法替代电热板加热溶解试样的方法;较适宜微波干燥时间为12 min;该微波加热方法的精密度及加标回收率（99.66%～100.58%）均达到要求,缩短分析时间1.5 h,节约能耗60%～70%,有利于快速指导生产,促进产品质量稳定。

Study on Determining Content of Potassium in Compound Fertilizer by Microwave Heating Technology

During measuring the content of potassium in compound fertilizer by potassium tetraphenylborate gravimetric method, the general electric hot plate heating technology used in handling the sample had some disadvantages of time consuming and energy consumption, therehy further affecting rapid analysis. In this research, the microwave heating technology, which was characterized as fast dissolvement and drying, was used for measuring the content of potassium oxide in compound fertilizer. The experimental results demonstrated that the electric hot plate heating method could be replaced by microwave heating. With high temperature for 5 minutes to dissolve the sample, and the accurate drying time was 12 minutes. Also, the precision and addition standard recovery rate （99.66%～100.58%） of the method met the requirements respectively. The method reduced the analysis time by one hour and a half and saved the energy by 60% ～ 70%,improved ei~cieney,quality and stability of production.