陰イオン交換樹脂による定性分析

概要

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Anion exchange resin (Amberlite IRA-410) was used as RCl, RS, ROH and RCO3 forms. At first the sample solution was passed through the column of RCl form exchanger. The first group metals precipitated as chloride. The precipitates were filtered and the filtrate was passed through the column of RS form exchanger. The second and the third group metals except Al and Cr precipitated as sulfide. The solution containing these precipitates was acidified by HCl (0.3N). The precipitates of the third group metals were dissolved, while those of the second group metals do not. The latter were filtered and the filtrate was passed through the column of ROH form exchanger. The third group metals and Mg precipitated as hydroxide. By the addition of NH4Cl to the suspension, Mg(OH)2 alone was dissolved. The precipitates of the third group metals were filtered and the filtrate was passed through the column of RCO3 form exchanger. The fourth group metals precipitated. The precipitates were filtered and the filtrate containing the fifth group metals was treated by RH form cation exchanger. The precipitates of each group metals were determined by usual method of qualitative analysis. The RCl, RS, ROH and RCO3 form anion exchange resins were regenerated by HCl, yellow ammonium sulfide, NaOH and (NH4)2CO3 respectively.
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