Highly Sensitive Spectrophotometric Determination of Ultra Trace Amounts of Selenium

A catalytic-kinetic method for the determination of selenium is proposed. Brilliant cresyl blue is reduced by sodium sulphide to form a colourless product. The reaction is accelerated by ultra trace amounts of Se(IV), and can be followed by measuring the decrease in absorbance of the dye at 630 nm a...

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Bibliographic Details
Published in:Analytical letters 1997-03, Vol.30 (5), p.973-984
Main Authors: Ensafi, Ali A., Mansour, H. Rahimi, Soltanie, M. Khalifeh
Format: Article
Language:English
Subjects:
Analytical chemistry
Brilliant Cresyl Blue
Catalytic
Chemistry
Exact sciences and technology
Selenium
Spectrometric and optical methods
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Summary:A catalytic-kinetic method for the determination of selenium is proposed. Brilliant cresyl blue is reduced by sodium sulphide to form a colourless product. The reaction is accelerated by ultra trace amounts of Se(IV), and can be followed by measuring the decrease in absorbance of the dye at 630 nm and 30°C. selenium can be determined in the range of 0.0001 - 0.500 μg.ml −1 with a limit of detection of 3 × 10 −5 μg.ml −1 . The relative standard deviations are 2.5, 2.2 and 2.0% for 0.10. 10.0, and 100.0 ng.ml −1 of Se(IV), respectively. This method was successfully applied to the determination of selenium in waste water.
ISSN:0003-2719
1532-236X
DOI:10.1080/00032719708002311