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Study of colour-developing factors in spectrophotometric determination of cyanide by the pyridine-barbituric acid method

Untersuchung der Farbbildungsfaktoren bei der spektrophotometrischen Bestimmung von Cyanid nach der Pyridin-Barbitursäure-Methode

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Summary

The decomposition of cyanide-pyridine-barbituric acid in the wavelength around λmax=583 nm gives rise to formation of a new color species around λmax=490nm. Both reactions are first-order reactions with the same K value of 0.066 hr−1, but with opposite sign. The pH value, the nature and concentration of the buffer solution influence absorption to a considerable extent. A method for estimation of cyanide is suggested.

Zusammenfassung

Die Zersetzung von Cyanid-Pyridin-Barbitursäure bei der Bandbreite um λmax=583 nm verursacht die Bildung einer neuen Farbspecies um λmax=490 nm. Beide Reaktionen sind solche erster Ordnung mit dem selben K-Wert von 0,066 hr−1, aber mit umgekehrtem Vorzeichen. pH-Wert, Art und Konzentration der Pufferlösung beeinflussen die Absorption in beträchtlichem Maß. Eine Methode zur Bestimmung von Cyanid wird vorgeschlagen.

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Authors and Affiliations

  1. Institute of Nuclear Energy Research, Lung-Tan, Taiwan, Republic of China

    Chun -Ching Chien, Fu -Chung Chang & Shaw -Chii Wu

Authors
  1. Chun -Ching Chien
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  2. Fu -Chung Chang
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  3. Shaw -Chii Wu
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Chien, C.C., Chang, F.C. & Wu, S.C. Study of colour-developing factors in spectrophotometric determination of cyanide by the pyridine-barbituric acid method. Mikrochim Acta 74, 9–16 (1980). https://doi.org/10.1007/BF01196481

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  • DOI: https://doi.org/10.1007/BF01196481

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