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一、前言球墨钢铁中除了存在大量铁元素外,锰含量较高,其余杂质元素均在0.1%以下。只要除去大量铁就可以进行稀土与钙镁元素的测定。我们采用乙醚萃取方法分离大量铁后,用偶氮肿Ⅲ此色测定稀土,用EDTA络合滴定法测定钙镁。这一方法的优点是: (1)用乙醚萃取代替了氟化物稀土沉淀分离,简化了手续,缩短了分析时间。
First, the foreword Ductile iron in addition to a large number of iron, the manganese content is higher, the rest of the impurity elements are below 0.1%. As long as the removal of a large number of iron can be rare earth and calcium and magnesium element determination. We use ether extraction method to separate a large amount of iron, the azo chromogenic determination of rare earth Ⅲ, with EDTA complexometric titration of calcium and magnesium. The advantages of this method are: (1) extraction of ether instead of fluoride precipitation of rare earth precipitation, simplifying the procedure and shortening the analysis time.