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一、方法原理提要:存在于溶液中的钾,在酸性介质或碱性介质中和四苯硼钠作用,能定量析出四苯硼钾沉淀,过量的四苯硼钠可以季胺盐回滴。目前容量法测定钾多以四苯硼钠沉淀钾,经过滤分离测定。本法特点:对存在严重铵离子干扰试样,在碱性介质中以甲醛隐蔽;加入松节油使四苯硼钾沉淀进入松节油相,不需过滤分离而直接回滴经在含钙镁铵的溶液中加入已知钾测定其结果相对误差在2%以下,本法使用一年多来测定样品一千多个,证明手续简单,数据稳
First, the principle of the method Abstract: Presence of potassium in solution, in the acidic medium or alkaline medium and the role of sodium tetraphenylborate precipitation of tetraphenylboron can be quantitative precipitation, excess sodium tetraphenylborate can be quaternary ammonium salt back drop. At present, the volumetric method for the determination of potassium and potassium tetraphenylborate sodium precipitation, measured by filtration. The law of the characteristics: there is a serious interference sample of ammonium ions, formaldehyde in the medium hidden in formaldehyde; adding turpentine tetraphenylboron potassium precipitate into the turpentine phase, without filtration separation directly back through the solution containing calcium magnesium Known by adding K known to the results of the relative error of 2% or less, the law used more than a year to determine more than a thousand samples prove that the procedure is simple, stable data