ヨウ素を用いる4-アミノアンチピリン法による廃水中のフェノールの吸光光度定量

概要

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The 4-aminoantipyrine method is adopted in Japan Industrial Standard (JIS K 0102) as a method for the determination of phenols in industrial waste water because of its high sensitivity and good reproducibility. However, a troublesome problem arised in the laboratory waste water treatment. Namely, hexacyanoferrate (III) ion which was used as an oxidizing agent in the reaction of phenols with 4-aminoantipyrine could not be decomposed under the common alkaline chlorination process for the waste water containing cyanide. The 4-aminoantipyrine method with iodine instead of potassium hexacyanoferrate (III) was reformed. To 100 ml of sample solution containing not more than 0.05 mg of phenol taken in a 300 ml separating funnel, 3 ml of ammonium buffer solution (pH 10), 2.0 ml of 4-aminoantipyrine solution and 7 ml of 0.05 M iodine solution were added. The mixture was allowed to stand for 3 min and then shaken for 2 min with 10.0 ml of chloroform. The absorbance of chloroform phase was measured at 460 nm. The analytical curve for phenol was linear in the concentration range of 1 μg to 50 μg. The precisions (C. V.) were 6.1 %, 0.9 %, and 0.7% for phenol of 2μg, 20μg, and 50 μg, respectively.
社団法人日本分析化学会の論文
1983-12-05