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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.18 [2011] >
IJCT Vol.18(2) [March 2011] >
| 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 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.18(2) [March 2011]
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