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Spectrophotometric determination of low-level concentrations of Se in aqueous solutions

Published online by Cambridge University Press:  05 July 2018

A. Matamoros  and
L. G. Benning
A. Matamoros*
Affiliation:
Earth and Biosphere Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
L. G. Benning
Affiliation:
Earth and Biosphere Institute, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
*
*E-mail: [email protected]
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Abstract

This paper describes the design, testing and validation of a simple and inexpensive spectrophotometric method for total Se analysis in aqueous solution based on the azo coupling reaction of amines. In this reaction, selenite ions react with hydroxylamine hydrochloride (NH2OH.HCl), which in turn diazotizes p-Nitroaniline and is coupled with N-1-naphthyl-ethylenediamine dihydrochloride (NEDA) to form a red coloured azo compound. This azo compound has a maximum absorption peak at 545 nm, an apparent molar absorption of 2.85x104 l mol-1 cm-1 and it follows the Beer’s law in the range from 0.01 to 2.50 mg/l with R2 = 0.9998. Interferences between the azo reaction and non-targeted ions often present in environmental samples (i.e., NO3-, CO3-, Cl- or metals) were investigated and specific protocols to overcome them were implemented. The advantages of the new method for low levels of Se in aqueous solutions are its high sensitivity and reproducibility, and the fact that measurements are simple, rapid and low-cost.

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 451 - 454
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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