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钾离子的分析方法很多,如火焰光度法、离子选择性电极法等,但仪器较贵、易坏、不易修;化学分析法也不少,但操作较麻烦,费时。本文介绍酸硷滴定法间接测定钾,此法虽较旧,但经改进后快速且准确,适合含钾产品的中间控制,特别对乡镇企业的含钾分析有现实意义。该法利用酒石酸与钾离子反应,生成酒石酸氢钾沉淀,沉淀物经过滤、洗涤,用氢氧化钠滴定。试剂及仪器便宜、易购,操作简便、快速,分析一个样品约15～20分钟。特别是钾含量低、钠含量高时,准确度仍较高,相对误差可达0.5%左右。
Analysis of potassium ions are many, such as flame photometry, ion selective electrode method, but the instrument is more expensive, easily broken, not easy to repair; chemical analysis is also a lot less, but the operation is more cumbersome and time-consuming. This article describes the indirect determination of potassium by acid-base titration. Although this method is older, it has been improved quickly and accurately and is suitable for intermediate control of potassium-containing products. It is of particular significance for the analysis of potassium in township and village enterprises. This method utilizes the reaction of tartaric acid with potassium ions to produce a potassium hydrogen tartrate precipitate which is filtered, washed and titrated with sodium hydroxide. Reagents and equipment cheaper, easy to buy, easy to operate, fast, analysis of a sample of about 15 to 20 minutes. In particular, low potassium content, high sodium content, the accuracy is still high, the relative error of up to 0.5%.