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Title: Spectrophotometric determination of osmium(VIII) in trace amounts using ethylene thiourea (ETU) as chromogenic reagent
Authors: Joseph, Bincy
John, Sam
Prajila, M
Joseph, Abraham
Keywords: Osmium;Derivative spectrophotometry;Ethylene thiourea;Chromogenic reagent
Issue Date: Mar-2011
Publisher: NISCAIR-CSIR, India
Abstract: A simple and highly sensitive spectrophotometric method has been described for the determination of trace amount of osmium(VIII) using ethylene thiourea (ETU) as a chromogenic reagent. The method is based on the formation of an instantaneous purple coloured complex at room temperature by the reaction of osmium(VIII) with ETU in strongly acidic (pH=1) solution having absorption maximum at 490 nm and is confirmed using derivative spectrophotometry. Linear calibration graphs are obtained for 0.03-3 µg/mL of the analyte. Sandell's sensitivity (1.13×10-3 µgcm-2), molar absorptivity (16.87×104 Lmol-1 cm-1), detection limit (0.0291 µg/mL) and quantitation limit (0.0833 µg/mL) are also calculated. The method is optimized and different analytical parameters were evaluated. The stoichiometry of the complex is found to be 1:3 by Job's method and mole ratio method. The stoichiometry of the complex is further confirmed by synthesizing the solid compound and characterizing it by various physicochemical methods.
Page(s): 113-117
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.18(2) [March 2011]

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