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在测定球墨铸铁和中间合金中镁时,应用DDTC萃取分离多种杂质,可避免使用剧毒药品氰化钾并缩短操作周期。我们应用该分离法于稀土中间合金中稀土、镁的测定,也即于pH8—9的介质中用DDTC萃取分离杂质,同时使AL、Re、Ta、Ti等成氢氧化物而除去,然后就可用EDTA络合滴定法测定镁和钙。稀土可用偶氮胂Ⅲ比色法直接测定。方法较快速,5小时内可以完成4个样品的分析。分析方法:称样0.2克于200毫升烧杯中加
In the determination of magnesium in ductile iron and master alloy, DDTC extraction and separation of various impurities, to avoid the use of highly toxic drugs, potassium cyanide and shorten the operating cycle. We use this separation method for the determination of rare earth and magnesium in rare earth master alloys, that is, the impurities are extracted by DDTC extraction in a medium of pH 8-9, while AL, Re, Ta, Ti and the like are removed as hydroxides, Available EDTA complexometric titration of magnesium and calcium. Rare earth arsenazo Ⅲ colorimetric method can be directly measured. The method is fast and can complete the analysis of 4 samples in 5 hours. Analytical method: Weigh 0.2 g in 200 ml beaker