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Separation and determination of metals as complexes of 1-nitroso-2-naphthol-6-sulphonic and 2-nitroso-1-naphthol-6-sulphonic acids

I: Ion-pair extraction and spectrophotometric method

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Abstract

A sensitive ion-pair liquid-liquid extraction-spectrophotometric method has been developed for the determination of copper, palladium, iron and cobalt, based on the formation of metal complexes with 1-nitroso-2-naphthol-6-sulphonic acid or 2-nitroso-1-naphthol-6-sulphonic acid as primary ligand, and zephiramine as counter-ion. The coloured metal complexes obtained over different pH ranges are easily and quantitatively extracted into dichloromethane. The method has been tested with samples containing known amounts of copper, palladium, iron and cobalt in ultrapure water. The reagents provide a sensitive spectrophotometric method for determining these metals.

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Authors and Affiliations

  1. Department of Chemistry, University of Helsinki, Vuorikatu 20, SF-00100, Helsinki, Finland

    Heli Sirén & Marja-Liisa Riekkola

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  1. Heli Sirén
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  2. Marja-Liisa Riekkola
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Sirén, H., Riekkola, ML. Separation and determination of metals as complexes of 1-nitroso-2-naphthol-6-sulphonic and 2-nitroso-1-naphthol-6-sulphonic acids. Mikrochim Acta 90, 159–173 (1986). https://doi.org/10.1007/BF01364298

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  • DOI: https://doi.org/10.1007/BF01364298

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