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Spectrophotometric determination of mercury with thiocyanate and Rhodamine B

Spektrophotometrische Bestimmung von Quecksilber mit Rhodanid und Rhodamin B

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Summary

Mercury(II) in the presence of a large excess of thiocyanate forms a violet colour with Rhodamine B. The complex formed can be stabilized by addition of poly(vinyl alcohol), and forms the basis for a spectrophotometric method for determination of trace amounts of mercury. The calibration graph for measurement at 610 nm is linear in the range 1–15μg of mercury per 25 ml, with a molar absorptivity of 1.1×105l· mole−1·cm·. The effect of foreign ions has been studied and the method can be applied to the determination of mercury in air with reliable analytical results.

Zusammenfassung

In Gegenwart eines großen Überschusses von Rhodanid bildet Hg(II) mit Rhodamin B eine violette Färbung. Durch Zusatz von Polyvinylalkohol kann dieser Komplex stabilisiert werden und bietet somit die Grundlage für die spektrophotometrische Bestimmung von Hg-Spuren. Die Eichkurve für die Messung bei 610 nm verläuft für 1–15μg Hg/25 ml linear. Die molare Absorptivität beträgt 1,1×105 l·mol−1·cm−1. Die Fremdionenwirkung wurde untersucht. Das Verfahren kann zur Hg-Bestimmung in Luft verwendet werden.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Sciences, University of Murcia, Spain

    M. Hernandez Córdoba, I. López Garcia & C. Sánchez-Pedreño

Authors
  1. M. Hernandez Córdoba
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  2. I. López Garcia
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  3. C. Sánchez-Pedreño
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Hernandez Córdoba, M., López Garcia, I. & Sánchez-Pedreño, C. Spectrophotometric determination of mercury with thiocyanate and Rhodamine B. Mikrochim Acta 84, 467–475 (1984). https://doi.org/10.1007/BF01197161

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  • DOI: https://doi.org/10.1007/BF01197161

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