Low alloy steel-Determination of indium content-Butyl acetate extraction and separation-Crystal violet benzene extraction photometric method

After the sample is dissolved in hydrochloric acid and nitric acid, it is repeatedly evaporated to dryness with hydrobromic acid to convert indium to bromide. At the same time, tin, antimony and most of bismuth are volatilized and removed, and then extracted with butyl acetate in hydrobromic acid medium , Hydrochloric acid back extraction to separate indium from interfering elements, adding potassium iodide to sulfuric acid medium to make indium generate indium iodide complex anion [InI4]-, and react with crystal violet to generate colored compound, the compound is easily soluble in benzene and shows stable blue purple, This is used for photometric determination. Calculate the mass fraction of indium.

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