グクチル鑄鐵中の Mg 定量法

概要

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Chemical analytical method (Phosphate gravimetric method or Oxine volumetric method) of Mg in ductile cast iron was planned and experimented by using the Mg standard solution, and compared with spectrographic determinations. Outline of the experiment is as follows : - (1) Sample is dissolved in HC1+HNO_3, evaporated and baked. After cooling, it is dissolved by HCl, and then silica, graphite, etc., are separated by filtration. (2) The filtrate is transfered to a separating funnel, and most of the iron is separated by ether treatment. (3) Extractive acid layer solution is neutralized by Na_2CO_3, and the Fe, Al, etc. remained are precipitated by addition of NaOH_3CO_2. The solution is heated to boil and the precipitates are separated by filtration. (4) Mn is separated by addition of Br water, and then Ca is separated by the (NH_4)_2 C_2O_4 reagent. (5) Gravimetric method : From the filtrate, Mg is usually determined as the pyrophosphate. Volumetric method : From the filtrate, (if Cu is present, it is separated by H_2S gas) Mg is precipitated by oxine alcohol solution, then dissolved by HCl, and titrated with the N/25KBrO_3-N/25Na_2S_2O_3 standard solution.
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