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高纯度的磷酸氢钙大量用作日光灯的卤磷酸钙荧光粉(下称卤粉)的基质材料。在合成卤粉的过程中,准确地测定磷酸氢钙中磷及钙的含量,对于调整组分制得高质量的卤粉具有决定性意义。目前已有多种方法用于测定磷,但不尽完善。为此,本文介绍采用国产732型强酸性阳离子交换树脂吸附、除去磷酸氢钙溶液中的钙离子,并避免了磷钼铵法出现的缺点。经过吸附除钙的洗
High purity of dicalcium phosphate is widely used as fluorescent halogenated calcium phosphate phosphor (hereinafter referred to as halogen powder) matrix material. In the process of synthesizing halogen powder, the accurate determination of phosphorus and calcium in dicalcium phosphate is of decisive significance for adjusting components to produce high-quality halogen powder. There are many ways to determine phosphorus, but not perfect. To this end, this paper describes the use of domestic 732 strongly acidic cation exchange resin adsorption, removal of calcium ions in calcium hydrogen phosphate solution, and to avoid the shortcomings of the emergence of phosphomolybdate method. After adsorption of calcium in addition to washing