Journal of Sciences, Islamic Republic of Iran, ( ISI ), Volume (1), No (4), Year (1990-7) , Pages (266-269)

Title : ( Spectrophotometric Determination of Osmium (VIII) WITH 1-HYDROXY 2- PYRIDINE - THIONE (SODIUM SALT) AS A REAGENT )

Authors: Hossein Ahmadzadeh , A. Safavi , A. Massoumi ,

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A spectrophotometric study of osmium (VIII) complex of 1-hydroxy 2- pyridine thione (HPT) is presented. A red-violet complex, Os (HPT)4 is formed in a highly ~cidic solution, and shows maximum absorbance at 500 nm with molar absorptivity of 5.12 x 101. mol1• cm·1• Beer s law is obeyed in the range of 3-60 ppm. Sandel s sensitivity of the method is 0.37 p,g. cm-2per0.001 absorbance unit. V (V), Pt (IV), Cu (II), Sn (IV), Cr (VI), and N03• interference. To overcome the interference and improve the selectivity, the Os (VIII) as OsO 4 is extracted in CCI4 and the extracted Os (VIII) is converted to the complex and measured spectrophotometrically. This method reduces the number of interferences to V(V), Pt (IV), and N03-. The method offers the advantages of simplicity, speed and high precision. A spot test for the detection of traces of osmium is also presented. Introduction Several methods have been proposed dealing with various chromogenic reagents for the determination of Jsmium (1-5]. A number of procedures are based on :he catalytic effect of osmium in a specific reaction [6, 7]. Some of these reagents react slowly with osmium and conditions for obtaining reproducible color are usually empirical. The sodium salt of !-hydroxy 2-pyridine thione was used for spectrophotometric determination of Fe (III), Pd and turbidimetric determination of Ag [8-10]. In this study, HPT is suggested as a reagent for spectrophotometric determination of osmium (VIII) and its detection by spot test. This reagent forms an intense red-violet coloration with Os (VIII). The complex shows an absorption maximum at 500 nm, which appears to be a sensitive reagent for the detemination of microgram amounts of osmium (VIII) with the advantages of simplicity, rapid determination in highly acidic solutions and reasonable selectivity.

Keywords

, Spectrophotometric determination; osmium (viii); 1, hydroxy 2, Pyridine ,
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@article{paperid:1034666,
author = {Ahmadzadeh, Hossein and A. Safavi and A. Massoumi},
title = {Spectrophotometric Determination of Osmium (VIII) WITH 1-HYDROXY 2- PYRIDINE - THIONE (SODIUM SALT) AS A REAGENT},
journal = {Journal of Sciences, Islamic Republic of Iran},
year = {1990},
volume = {1},
number = {4},
month = {July},
issn = {1016-1104},
pages = {266--269},
numpages = {3},
keywords = {Spectrophotometric determination; osmium (viii); 1-hydroxy 2-Pyridine - thione},
}

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%0 Journal Article
%T Spectrophotometric Determination of Osmium (VIII) WITH 1-HYDROXY 2- PYRIDINE - THIONE (SODIUM SALT) AS A REAGENT
%A Ahmadzadeh, Hossein
%A A. Safavi
%A A. Massoumi
%J Journal of Sciences, Islamic Republic of Iran
%@ 1016-1104
%D 1990

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