1,10-フェナントロリンまたはバドフェナントロリンによるニッケル基合金中の鉄の吸光光度定量

概要

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The spectrophotometric method was studied for determining about 0.1% of iron in nickel-base alloys with 1,10-phenanthroline or bathophenanthroline (4,7-diphenyl-1,10-phenanthroline). Iron was previously separated by methyl isobutyl ketone (MIBK) extraction from 6M hydrochloric acid solution. When the sample contained a few percent of molybdenum, low values for iron were obtained. This was prevented by adding large amounts of hydroxylamine hydrochloride and 1,10-phenanthroline. Satisfactory results were obtained for (0.1〜0.2)g of sample by adding 5ml of 100g/l hydroxylamine hydrochloride solution and 20ml of 2g/l phenanthroline solution tn 100ml of final solution. The apparent molar absorptivity was 1.1×10_4 1mol^<-1> cm^<-1> at 510nm. In place of 1,10-Phenanthroline, bathophenanthroline serves the purpose. After separation by MIBK extraction, iron (III) was reduced with ascorbic acid, and the iron(II)-bathophenanthroline-perchlorate complex was extracted' into chloroform. The absorbance of the organic phase was measured at 532nm. The apparent molar absorptivity at this wavelength was 2.2×10^4 1mol<-1> cm^<-1>. The results obtained by the bathophenanthroline method agreed quite well with those obtained by 1,10-phenanthroline method.
社団法人日本分析化学会の論文
1975-03-10