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Distribution Equilibria of 2-(2-Pyridylazo)-5-methylphenol and Its Zinc(II) Chelate between Two Phases Separated from a Micellar Solution of a Nonionic Surfactant

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Abstract

Distribution equilibria of 2-(2-pyridylazo)-5-methylphenol (PAP-5-Me) and its zinc(II) chelate have been studied between two phases which were formed from a micellar solution of poly(oxyethylene)-4-nonylphenyl ether with 7.5 oxyethylene units (PONPE-7.5). One phase was rich in PONPE-7.5 and the other was the aqueous phase. The volume ratio of the former to the latter was about 0.6:49.5 under the present conditions. On the basis of the distribution curves for PAP-5-Me and zinc(II) as a function of pH, the acid dissociation constant of PAP-5-Me, the formation constasnt of the chelate, and the partition constants of PAP-5-Me and the chelate were determined at 293 K and ionic strength of O.I(NaCI).

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Authors and Affiliations

  1. Department of Applied Chemistry, Muroran Institute of Technology, Mizumoto-cho, Muroran, 050, Japan

    Shigeru Kawamorita & Hiroto Watanabe

  2. Government Industrial Development Laboratory, Hokkaido, Tsukisamu-Higashi, Sapporo, 061-01, Japan

    Kensaku Haraguchi

Authors
  1. Shigeru Kawamorita
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  2. Hiroto Watanabe
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  3. Kensaku Haraguchi
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Kawamorita, S., Watanabe, H. & Haraguchi, K. Distribution Equilibria of 2-(2-Pyridylazo)-5-methylphenol and Its Zinc(II) Chelate between Two Phases Separated from a Micellar Solution of a Nonionic Surfactant. ANAL. SCI. 1, 41–45 (1985). https://doi.org/10.2116/analsci.1.41

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  • DOI: https://doi.org/10.2116/analsci.1.41

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