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A selective and sensitive spot-test for gold

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Summary

A new spot test for gold has been developed, based on the oxidation of colourless phenolphthalin to red phenolphthalein in alkaline medium. The sensitivity is 0.2μg of gold on a spot-plate and 0.15μg on filter paper. Ce(IV) interferes seriously, and Pt(IV) at high concentrations, but Pd(II), Cu(II), Fe(III), Cr(III), Ni(II), UO2(II), ClO4 −, CrO4 2−, BrO3 −, IO3 −, MoO4 2−, and WO4 2− do not.

Zusammenfassung

Eine neue Tüpfelreaktion für Gold wurde entwickelt, die auf der Oxydation des farblosen Phenolphthalins zu rotem Phenolphthalein in alkalischem Milieu beruht. Die Empfindlichkeit beträgt auf der Tüpfelplatte 0,2μg Gold, auf Filterpapier 0,15μg. Cer(IV) stört stark, Pt(IV) in hoher Konzentration; hingegen stören Pd(II), Cu(II), Fe(III), Cr(III), Ni(II), UO2(II), ClO4 −, CrO4 2−, BrO3 −, JO3 −, MoO4 2− und WO4 2− nicht.

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Authors and Affiliations

  1. Chemical Research Laboratory, The Faculty of Engineering, Ain Shams University, Abbassia, Cairo, Egypt

    Salah A. Shahine & Rafaa M. Mahmoud

Authors
  1. Salah A. Shahine
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  2. Rafaa M. Mahmoud
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Shahine, S.A., Mahmoud, R.M. A selective and sensitive spot-test for gold. Mikrochim Acta 65, 89–92 (1976). https://doi.org/10.1007/BF01218252

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  • DOI: https://doi.org/10.1007/BF01218252

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