インドフェノール法を用いるアンモニア,アニリン及びp-アミノフェノール混合試料の定量

概要

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Ammonia reacts with phenol, sodium nitroprusside, sodium hypochlorite, and sodium hydroxide (condition A) producing a blue colored indophenol (630 nm), but aniline is transferred to the same indophenol blue with phenol, sodium hypochlorite, and sodium hydroxide (condition B). p-Aminophenol is trasferred with phenol and sodium hydroxide (condition C). The relative reaction rates of ammonia, aniline, and p-aminophenol were 0.725, 0.308, and 1.00, respectively. These three indophenol blues had a same absorption spectrum and no interference with each other. Mixed sample containing three substances whose each concentration was 10^<-8> mol/ml could be determinated separately by selection of the coloring condition A, B, or C within 3 % deviation. Other amino compounds were classified into the three coloring conditions as follows. Sulfanilic acid, dimethyl aniline, mono methyl amine, and o-, m- and p-phenylenediamine belonged to the condition A. Methyl aniline, p-amino benzoic acid and o- and m- toluidine belonged to the condition B. Hydroxylamine hydrogenchloride, N,N'-dimethyl-p-phenylenediamine and o-and p-aminophenol belonged to the condition C.
社団法人日本分析化学会の論文
1982-12-05