Summary
1,3-Bis[(2-pyridyl)methyleneamino]thiourea (PMAT) and 1,3-bis-[(2-pyridyl) methyleneamino]guanidine (PMAG) have been examined to evaluate their usefulness as selective spectrophotometric reagents for iron. PMAT forms a red colour with iron(II) in acid medium, with maximum absorption at 590 nm, the molar absorptivity being 7.2×103l·mole−1·cm−1. PMAG also gives a red colour and the reaction at pH 4.2 is very sensitive (ε=2.09×104l·mole−1·cm si−1 at 570 nm). The reagents have been applied to the determination of iron in ore and alloys.
Zusammenfassung
1,3-Bis(2-pyridyl)-methylenaminothioharnstoff (PMAT) und 1,3-Bis-(2-pyridyl)-methylenaminoguanidin (PMAG) wurden auf ihre Eignung als selektive spektrophotometrische Reagenzien für Eisen geprüft. PMAT gibt in saurem Medium mit Fe(II) eine Rotfärbung mit dem Absorptionsmaximum bei 590 nm und der molaren Absorptivität 7,2·103l·mol−1·cm−1. PMAG gibt ebenfalls eine Rotfärbung. Die Reaktion bei pH 4,2 ist sehr empfindlich (ε=2,09·104l· mol−1·cmr−1 bei 570 nm). Die beiden Reagenzien wurden zur Bestimmung des Eisens in Erzen und Legierungen verwendet.
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Barragán de la Rosa, F.J., Gómez Ariza, J.L. & Pino, F. Derivatives of carbohydrazide, thiocarbohydrazide and diaminoguanidine as photometric analytical reagents. III. Mikrochim Acta 81, 159–169 (1983). https://doi.org/10.1007/BF01497607
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DOI: https://doi.org/10.1007/BF01497607