Summary
A method has been developed for the direct spectrophotometric determination of iron by using the reddish-orange coloured complex formed in the interaction of iron with bis(2-hydroxymethyl-5-hydroxy-4-pyrone-6)ketone. The red colour follows Beer's Law and is stable. The method is sensitive, reproducible and accurate. Of the several anions and cations studied, only a few interfered seriously in the determination of iron. However, the ones that do interfere seriously can be separated by conventional methods of separation.
Zusammenfassung
Zur direkten spektrophotometrischen Eisenbestimmung wird der rötlich-orange gefärbte Komplex benutzt, der sich aus Eisen und Bis(2-hydroxymethyl-5-hydroxy-4-pyron-6)keton bildet. Die Färbung befolgt das Beersche Gesetz und ist beständig. Das Verfahren ist empfindlich und liefert genaue und reproduzierbare Ergebnisse. Die wenigen Ionen, die erhebliche Störungen verursachen, können zuvor nach üblichen Verfahren abgetrennt werden.
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References
Ayres, G. H.: Analyt. Chemistry 21, 652 (1949); cf. Z. analyt. Chem. 131, 358 (1950).
Ringbom, A.: Z. analyt. Chem. 115, 332 (1939).
Woods, L. L.: unpublished data, Department of Chemistry, Texas Southern University, Houston, Texas (U.S.A.).
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Wilson, R.F., Daniels, R.C. Spectrophotometric determination of iron with bis(2-hydroxymethyl-5-hydroxy-4-pyrone-6)ketone. Z. Anal. Chem. 194, 190–194 (1963). https://doi.org/10.1007/BF00467426
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DOI: https://doi.org/10.1007/BF00467426