EDTA络合滴定法测定稀土镁中间合金中镁  

Determination of magnesium in rare earth-magnesium middle alloy by EDTA titrimetry

作　　者：胡珊玲[1] 张小联 彭光怀[1] 邱承洲[1] 

机构地区：[1]赣南师范学院功能材料化学重点实验室,江西赣州341000 [2]赣州三鑫新材料科技有限公司,江西赣州341000

出　　处：《冶金分析》2007年第9期51-53,共3页Metallurgical Analysis

基　　金：江西省科技厅重点项目<高强耐热稀土镁合金研制>基金资助;江西省教育厅重点实验室科技计划项目<高性能稀土镁合金研制>([2005]309)

摘　　要：研究了分别采用草酸和氢氧化铵沉淀分离稀土镁中间合金中的稀土,EDTA络合滴定法快速测定电解稀土镁中间合金中镁的两种方法。分析对比了两种方法的适用范围,结果表明,草酸分离稀土方法简便快速,但草酸用量需控制在理论用量的1.2～1.7倍,且合金中铁含量要求小于0.5%;氢氧化铵分离稀土方法分析流程比前者长,但可将主要干扰杂质铁分离完全,终点敏锐。两种方法均已应用于实际产品检测中,测定结果的相对标准偏差为0.69%～1.23%,回收率在97.2%～102.5%之间。Two methods for the determination of magnesium in rare earth--magnesium middle alloy by EDTA titrimetry, i. e. oxalic acid precipitation and ammonium hydroxide precipitation, were studied. The comparison for advantages and application scopes of both methods were carried out. The results show that the former is quicker,but the adding amount of oxalic acid needs to be controled in the range of 1.2--1.7 times of theoretical value and the content of iron in the alloy is required to be below 19.5 %. While the later is overelaborate,but it can completely separate magnesium from iron with sharp titration end point. In application of the two methods to the determination of magnesium in actual products, the RSD of 0. 69%--1. 23% and the recovery of 97.2%--102.5% are obtained.

关 键 词：EDTA滴定法 稀土镁中间合金 草酸沉淀 氢氧化铵沉淀 镁 

分 类 号：TG115.31[金属学及工艺—物理冶金]