p-アミノアゾベンゼンを用いる亜硝酸イオンの吸光光度定量(<特集>環境汚染物質の分析化学)

概要

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Sensitive spectrophotometric method for the determination of nitrite ion with p-aminoazobenzene was investigated : A 5ml of p-aminoazobenzene in acetic acid-methylcellosolve medium was added to 5〜10ml of aqueous solution of 2〜12μg of nitrite ion and the mixture was allowed to stand for 60min at about 25℃. The resulting solution was made alkaline by adding 5ml of 2M NaOH and diluted to 25ml with methylcellosolve. The absorbance at 570nm was measured against blank solution. Beer's law holds and the present method showed good reproducibility of relativestandard deviation 1.2%, and the molar absorptivity was 6.90×10^4l mol^<-1> cm^<-1>. Copper (II), tin (II) and sulfite, thiosulfate ion interfered with the determination of the analyte. The present method was applied for the determination of nitrite ion and nitrate ion in rainwater, and the results showed good agreement with those obtained with JIS method.
社団法人日本分析化学会の論文
1987-03-05