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一、前言用容量法测定铵钾混合溶液中的铵和钾时,一般用甲醛法测铵,在测钾时由于铵的存在干扰钾的测定,所以必须在测钾前将铵除去。本实验用四苯硼化钠——季胺盐回滴法测出铵钾总量,用甲醛法测出铵量,钾量则用差减法求得。结果证明,四苯硼化钠季胺盐回滴法在与测钾条件相同下可以准确测铵。所以在不去铵的情况下,可用于铵钾混合溶液的分别测定。
I. INTRODUCTION Determination of ammonium and potassium in ammonium-potassium mixed solution by volumetric method generally uses formaldehyde method to measure ammonium. When potassium is measured, the determination of potassium interferes with the determination of potassium due to the presence of ammonium, so ammonium must be removed before measuring potassium. In this experiment, the total amount of ammonium and potassium was measured by sodium tetraphenylborate-quaternary ammonium salt drop-back method, the amount of ammonium was determined by formaldehyde method, and the amount of potassium was calculated by the subtractive method. The results show that tetraphenyl borohydride quaternary ammonium salt back-drop method in the same conditions with the same potassium can be measured accurately ammonium. So do not go to the case of ammonium can be used for the separate determination of ammonium-potassium mixed solution.