Determination of Mg in Cast-Iron by EDTA Titration Method

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  • EDTA滴定法による鋳鉄中のMgの定量
  • EDTA テキテイホウ ニ ヨル チュウテツ チュウ ノ Mg ノ テイリョウ

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EDTA titration method for the determination of Mg in cast iron was developed. The procedure was as follows: Weigh a sample of 0.25 to 0.5 g. Add HCl and HNO3 and evaporate to dryness. Cool and take up the residue by adding 6 NHCl. Filter off SiO2 and G.C Transfer the filtrate to a separatory funnel. The solution is adjusted to an acidity of 6 N with HCl. Add methyl-isobuthyl-ketone and shake for 1 min. (iron is extracted in the solvent layer). Drain off the aqueous layer. Add HNO3 and evaporate to dryness. Add HCl and water and swirl to dissolve the salts. Add ammonium oxalate and NH4OH until the solution is alkaline. Filtered on a filter paper, Al, Ti, Cr and Ca remains on the filter paper. The filtrate is ajusted to pH 10 with NH4OH. Add KCN and Mg is titrated with EDTA using EBT as an indicator.

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