Evaluation of PAC, TAC, 2-IAC as metallochromic indicators in the EDTA titrations of nickel.

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概要

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• The rates of color change of 2-(2-pyridylazo)-4-methylphenol (PAC), 2-(2-thiazolylazo)-4-methylphenol (TAC) and 2-(2-imidazolylazo)-4-methylphenol (2-IAC) during EDTA–nickel titration have been determined. The rate is a thousand times greater for TAC and 2-IAC than for PAC. From equilibrium considerations, the rate of color change and the color contrast change, an evaluation of PAC, TAC, and 2-IAC as metallochromic indicators for nickel is given. The optimum pH ranges with TAC and 2-IAC are from 6 to 7 and from 5 to 7, respectively, at 80 °C. With PAC, the titration should be conducted with boiling at pH 4–5. 2-IAC is the best indicator due to the good visual color contrast and the wide pH range over which it is applicable.

• 公益社団法人 日本化学会の論文

著者

• Nakazawa Osamu

  Laboratory of Analytical Chemistry, Nagoya Institute of Technology

関連論文

• Evaluation of PAC, TAC, 2-IAC as metallochromic indicators in the EDTA titrations of nickel.

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