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关于钾的测定,四苯硼钠(Na-TPB)是测定钾的最佳试剂,通常用重量法和容量法来进行,但手续繁杂。高鸿等根据四苯硼钠在交流示波极谱图上存敏锐的切口,提出了钾的四苯硼钠示波极谱滴定的好方法〔《高等学校化学学报》1982,3(1)〕,我们将此法用于水泥及粘土中钾的测定获得了成功。由于在滴定终点时四苯硼钠示波极谱图切口消失敏锐,加之共存元素干拢很少,方法的准确度、精密度可与重量法比美。一、方法原理样品用酸或碱熔融法分解后制成试液,准确加入过量的Na-TPB溶液,以25％的NaOH
Sodium potassium tetraphenylborate (Na-TPB) is the best reagent for the determination of potassium, usually by gravimetric method and volumetric method, but the procedure is complicated. According to Gao Hong and other sodium tetraphenylborate oscillopolarographic polarography stored in the sharp incision, put forward potassium tetraphenylborate oscillopolarography titration of a good method [“Chemical Journal of Chinese” 1982,3 (1) 〕, We use this method for the determination of potassium in cement and clay has been successful. Because at the end of the titration tetraphenylboron oscillopolarographic incision keen disappeared, combined with few co-existence of elements to dry together, the accuracy of the method, precision and weight method than the United States. First, the principle of the method Sample acid or alkali melting method after the decomposition of the test solution, accurately add excess Na-TPB solution, with 25% NaOH