Summary
A spectrophotometric method has been developed for the determination of chromium in waste water with 5-Br-PADAP (2-(5-brorno-2-pyridylazo)-5-diethylaminophenol). Chromium(III) forms a blue-purple complex at pH 4.7 upon heating. The color is very stable and is highly sensitive for chromium. At 600 nm it obeys Beer's law in the concentration range of 0–15μg of Cr(III) per 25 ml. The sensitivity and molar absorptivity of the reaction are 0.00065μg of Cr(III) per cm2 and 7.93×1041 · mole−1 · cm−1, respectively. The continuous variation and molar ratio methods indicate that chromium forms 1∶2 complex with the ligand.
Zusammenfassung
Eine spectrophotometrische Methode zur Bestimmung von Chrom in Abwasser mit 5-Br-PADAP wurde ausgearbeitet. Chrom(III) bildet mit 5-Br-PADAP bei pH 4,7 durch Erhitzen einen blaupurpurnen Komplex. Die Farbe ist sehr beständig. Bei 600 nm entspricht die Färbung dem Beerschen Gesetz zwischen 0 und 15μg Cr(III)/25 ml. Die Empfindlichkeit der Reaktion beträgt 0,00065μg Cr(III)/cm2 und die molare Absorption 7.93×104 1 · mol−1 · cm−1. Die Untersuchung nach Job ergab für den Komplex das Molverhältnis Cr:Reagens=1∶2.
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Fu-sheng, W., Yu-rui, Z., Pel-hua, Q. et al. Spectrophotometric determination of microgram amounts of chromium(VI) and total chromium in waste water. Mikrochim Acta 78, 67–75 (1982). https://doi.org/10.1007/BF01206691
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DOI: https://doi.org/10.1007/BF01206691