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我们曾用乙酰丙酮掩蔽镁,解决了大量镁存在下钙的络合滴定问题,同时也消除了大量磷对钙的影响。今则利用硼酸盐缓冲液代替氨-铵盐缓冲液,以消除大量磷对镁的干扰。拟定的方法用于含铁钛锰低的磷矿中钙镁的测定,经过五年生产实践考验,证明方法简便、准确。主要试剂偶氮氯膦Ⅲ:0.03％。称取0.3克偶氮氯膦Ⅲ(华东师大五七化工厂)溶于1000毫升水中。应作空白试验。 KBY指示剂:称0.05克酸性铬蓝K、0.15克萘酚绿B、0.02克达旦黄,溶于25毫升水中,可用一周。
We used masking magnesium with acetylacetone to solve the problem of complex titration of calcium in the presence of a large amount of magnesium while also eliminating the effect of large amounts of phosphorus on calcium. Instead of ammonia-ammonium buffer, borate buffer is used to eliminate the interference of large amounts of phosphorus on magnesium. The proposed method is applied to the determination of calcium and magnesium in phosphate rock containing low iron, titanium and manganese. After five years of production practice, the method is simple and accurate. The main reagent chlorophosphonates Ⅲ: 0.03%. Weigh 0.3 grams of chlorophosphonazo Ⅲ (East China Normal University, five chemical plants) dissolved in 1000 ml of water. Should be a blank test. KBY indicator: said 0.05 grams of acid chrome blue K, 0.15 grams of naphthol green B, 0.02 grams of up to yellow, dissolved in 25 ml of water can be used for a week.