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Enhancement of phenols on ion-pair extraction of chromium(VI) with tetraphenylarsonium

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Abstract

The effect of phenols on the ion-pair extraction of chromium(VI) as chromate anion (HCrO −4 ) with tetraphenylarsonium cation (TPA+) has been investigated. By using TPACl, chromate is extracted as an ion-pair, TPA+·HCrO −4 , into organic solvents, but its extractability into nonpolar solvents such as carbon tetrachloride is very low. The addition of several phenols greatly enhances the extractability, e.g., the distribution ratio of chromium(VI) between carbon tetrachloride and water rises 5500-fold in the presence of 0.020M 3,5-dichlorophenol in the organic phase. The enhancement was larger when using more acidic phenols and less polar solvents. From the analysis of the extraction data for the 3,5-dichlorophenol-carbon tetrachloride system, it was shown that one molecule of chromate is extracted together with one TPA+ and 1–3 phenol molecules and the extraction constants were determined. The UV spectrum indicated the extracted species including chromate ester to the TPA+·ArOCrO −3 ·mArOH (m=1,2).

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Author notes

  1. N. Suzuki

    Present address: Graduate School of Science and Technology, Chiba University, Yayoi-cho, Inage-ku, 263, Chiba, Japan

Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Tohoku University, 980-77, Sendai, Japan

    S. Katsuta & N. Suzuki

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  1. S. Katsuta
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  2. N. Suzuki
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Katsuta, S., Suzuki, N. Enhancement of phenols on ion-pair extraction of chromium(VI) with tetraphenylarsonium. J Radioanal Nucl Chem 222, 45–50 (1997). https://doi.org/10.1007/BF02034245

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  • DOI: https://doi.org/10.1007/BF02034245

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