Determination of selenium speciation in river waters by adsorption on iron(III)-Chelex-100 resin and differential pulse cathodic stripping voltammetry
✍ Scribed by Tommaso Ferri; Paola Sangiorgio
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 679 KB
- Volume
- 321
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
This paper des~hes the preconcentration of Se(IV) from peHuted waters by irun(IH)-loaded Chelex-100 resin and its determination by differential pulse cathodic stripping voltammetry. The method is used to study selenium speciatm in waters, and a speciation method, suitable for concentratinn levels of environmental significance (ng/I), is defined and applied to a real polluted system (Tevere river). Besides the determination of Se(IV) and Se(VI), the method allows discrimination between "free" and "bound" dissolved Se(IV). As regards bound Se(IV), a non.labile interaction with an "unidentified species" is hypothesised and the conditional formation constant of the hypothesised process evaluated as well as the concentration of "unidentified species". Finally, the distn'bution of Se(VI) and -(IV) added to untreated water samples was studied.