EDTA滴定法测定钢渣中游离氧化镁  

EDTA Titrimetric Determination of Free Magnesium Oxide in Steel Slags

作　　者：王博[1] 刘家祥[1] 罗珣[1] 朱桂林[2] 卢忠飞[2] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]中国京冶工程技术有限公司,北京100088

出　　处：《理化检验（化学分册）》2011年第8期942-943,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：中国京冶建筑研究总院合作项目

摘　　要：以碘-乙醇溶液为催化剂,选择乙二醇作溶剂浸取钢渣中游离氧化镁,采用EDTA滴定法测定其中游离氧化镁的含量。试验中考察了碘-乙醇的最佳用量和K-B混合指示剂的最合适配比。结果表明:催化剂碘-乙醇溶液的添加量达碘与氧化镁的质量比为7.5比1,指示剂中酸性铬蓝K和萘酚绿B的比值为1比1.4时,滴定终点变色明显,滴定结果准确。在钢渣中加入纯氧化镁测定的平均回收率为96.5%,相对标准偏差(n=5)为1.3%。Using ethanolic solution of iodine as catalyst, the free magnesium oxide （f-MgO） in steel slags was extracted with glycol as solvent and determined by EDTA titration. Optimum values of the amount of iodine-ethanol solution and the ratio of K-B indicator were studied. It was shown that the end point of titration was found to have an obvious color change when the ratio of acid chrome blue K to naphthol green B in the solution was 1 ： 1.4 and the mass ratio of iodine to MgO was 7.5 ： 1. Test for recovery was made by addition of pure MgO to steel slag, giving values of average recovery of 96. 5% and RSD （n=5） of 1.3%.

关 键 词：EDTA滴定法 钢渣 游离氧化镁 乙二醇 碘-乙醇溶液 

分 类 号：O655.2[理学—分析化学]