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用氟电极作指示电极以电位滴定法测定铝的方法已有许多报导。我们在前一工作的启示下,又提出用氟电极的直接电位法来测定岩石中的三氧化二铝。方法基于在微酸性溶液中,铝与氟化钾作用定量生成铝氟酸钾沉淀: AlCl_3+6KF→K_3AlF_(?)↓+3KCl用氟电极测定过量沉淀剂中的氟,间接计算出三氧化二铝的含量。方法用于测定粘土、花岗岩、长石、闪长石中的三氧化二铝,获得了满意的结果。特别适用于高含量铝的测定,干扰少,无需分离,方法简便快速。
There have been many reports of the method of potentiometric titration of aluminum using a fluorine electrode as an indicator electrode. Inspired by the previous work, we also proposed the direct potentiometric method for the determination of aluminum oxide in rocks using a fluorine electrode. Method Based on the quantitative analysis of the effect of aluminum and potassium fluoride on the precipitation of aluminum hydrofluoride in a slightly acidic solution, AlCl 3 + 6KF → K 3 AlF 3 + ↓ + 3 KCl The fluorine in the excess precipitant was measured with a fluorine electrode and the concentration of trioxide Aluminum content. The method has been applied to the determination of aluminum oxide in clay, granite, feldspar and diorite, and satisfactory results have been obtained. Especially suitable for the determination of high content of aluminum, less interference, without separation, the method is simple and quick.