Spectrophotometric Determination of Os(VIII) with Nitroso R Salt as Chromogenic Reagent
Journal Title: Analele Universitatii "Dunarea de Jos" din Galati. Fascicula IX, Metalurgie si Stiinta Materialelor - Year 2011, Vol 34, Issue 3
Abstract
Several methods have been reported for the spectrophotometric determination of osmium with various chromogenic reagents. Some of these reagents react slowly with osmium and the conditions for obtaining reproductibile colours are usually empirical. In this context, a simple and sensitive spectrophotometric method for the determination of trace amounts of osmium(VIII) using disodium-1-nitroso-2-hydroxynaphthalene-3,6-disulphonate (Nitroso R salt) is described. The method is based on the formation of an Os–Nitroso R salt complex which exhibits two different colours as function of pH. Linear calibration graphs are obtained up to 60μg/mL of the analyte at pH = 4.8. The stoichiometry of the complex is found to be 1: 4 by mole ratio method. The method is optimized and different analytical parameters were evaluated. For instance, the calculated values for the molar absorptivity are of 3.645.103 L/mol.cm (pH=0; λ= 550nm) and 1.695.103 L/mol.cm (pH = 4.8; λ = 510 nm), respectively. The proposed method should be valuable for the determination of osmium(VIII) with good accuracy and precision.
Authors and Affiliations
Rodica WENKERT, Carmen PADURARU, Lavinia TOFAN, Strul MOISA
Keywords
Related Articles
- EP ID EP626961
- DOI -
- Views 88
- Downloads 0
Structural Changes Associated with the Pseudoelastic Response of Fe-Based Shape Memory Alloys
The pseudoelastic responses of two types of iron base shape memory alloys (SMAs) were introduced and discussed. The former was based on Fe-Mn-Si system, obtained by classical (CM) and by powder metallurgy (PM) manufactur...
Versatility of Nickel-Aluminium Bronzes as Wear Resisting Materials
The paper presents the results of experimental research regarding the establishing of some chemical positions of the nickel-aluminium bronzes used as monoblock and bimetallic bearings. The areas of the applications are...
On the Kinetics of Sol Gel Al:ZnO Thin Films Crystallization on Silicon Substrate
Recently, there is a growing interest in applying ZnO thin films on silicon buffer substrates for p-n junction devices, optical wave guide, etc. A sol gel process is very attractive technique for obtaining oxide thin fil...
Electrodeposition and Characterization of Ni-Si Nanocomposite Coatings
In this paper is presented morphological aspects and corrosion behaviour of composite coatings having nickel as metal matrix and silicon as dispersed phase obtained during electrodeposition process of nickel. Silicon mea...
Elastoplastic Model for the Steel Bars under Thermal Treatments
In order to understand material behavior, during the stresses action produced by thermal effects of volume, was started from Hooke relations, whereat was added the expressions that take into account these effects. Have b...