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用络合滴定法测定稀土合金中稀土和镁,以借铜试剂在不同pH条件下分别沉淀分离干扰元素后进行络合滴定较为普遍。包钢有色一厂等为缩短分析流程,提出选择在pH4～4.5的醋酸介质中借铜试剂沉淀分离铁和部分钍等元素后用络合滴定法测定钙、镁和稀土。本文在此基础上作了某些改进:溶解样品的器皿用刚玉坩埚代替黄金
The determination of rare earth and magnesium in the rare earth alloy by complexometric titration is more common because of the complexation titration after the interfering elements are separated and precipitated by different copper ions by using copper reagent. In order to shorten the analysis process, Baotou Steel Non-ferrous Metal Factory proposed the method of complexation titration for the determination of calcium, magnesium and rare earth by the method of precipitation and separation of iron and some thorium elements in the acetic acid medium of pH4 ~ 4.5. This paper made some improvements on the basis of this: a sample of dissolved vessels with corundum crucible instead of gold