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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/A15D8045-CA82-465A-A7DF-2B761168C568 | ||
| Year | 2009 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | N. Kallithrakas-Kontos, P. Koulouridakis, V. Hatzistavros and I. N. Aretaki, "Chromium speciation by TXRF analysis," X-Ray Spectrom., vol. 38, no. 2, pp. 152–156, Jan. 2009. doi:10.1002/xrs.1141 https://doi.org/10.1002/xrs.1141 | ||
| Appears in Collections |
Chromium (Cr) is an element which usually occurs in two different forms, Cr(III) and Cr(VI). As Cr(VI) is much more toxic than Cr(III), no complicated analytical methods with low detection limit are needed for chromium speciation. In the present work, a new method is presented for chromium speciation at low concentrations by selective membrane collection and total Reflection x-ray fluorescence (TXRF) analysis. Various membranes were produced on the surface of quartz reflectors containing different complexing ligands in Nafion and poly vinyl chloride (PVC) matrices. The membranes were produced on the surface of quartz glass, while the reflectors were immersed in water solutions with low concentrations of chromium salts for many hours. When the equilibration stage was achieved, the reflectors were analyzed by TXRF. Completely selective membranes for Cr(III) and Cr(VI) were prepared with minimum detection limits lower than 0.6 ng.ml−1 (ppb) in drinking water
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