Studies on photochemical vapor generation of selenium with germicidal low power ultraviolet mercury lamp
Authors: Campanella B., Menciassi A., Onor M., Ferrari C., Bramanti E., D’Ulivo A.
Autors Affiliation: Università di Pisa, Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13, 56124 Pisa, Italy; C.N.R., Istituto di Chimica dei Composti Organometallici, S.S. di Pisa, Via Moruzzi, 1, 56124 Pisa, Italy; C.N.R., Istituto Nazionale di Ottica, UOS di Pisa, Via Moruzzi, 1, 56124 Pisa, Italy
Abstract: Photochemical vapor generation (photo-CVG) with flow injection – atomic fluorescence spectrometry was investigated for the determination of selenium, using formic and acetic acids as photochemical reagents. Using a germicidal low power ultraviolet mercury-based lamp, emitting both the 185 and 254 nm Hg lines, mild reaction conditions can be achieved in formic acid medium, where optimal sensitivity was obtained, at 0.3-0.5% w/w acid concentrations, whereas the optimal sensitivity could be attained with acetic acid in the range from 12 to 35% w/w. The only volatile Se product identified by gas chromatography-mass spectrometry from formic acid based photo-CVG was selenium carbonyl. A series of dedicated experiments were performed using photo-CVG and pure dimethylselenide in order to identify reaction pathways contributing to the formation of non-volatile selenium species or to the degradation of volatile selenium species. Under the optimized conditions in formic add, using 250 mu L sample volume, the limits of detection and quantification were 0.10 and 035 mu g L-1, respectively. The effect of several interfering species was investigated and the method was tested in the analysis of certified reference materials. (C) 2016 Elsevier B.V. All rights reserved.
Journal/Review: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume: 126 Pages from: 11 to: 16
More Information: DOI: 10.1016/j.sab.2016.10.007KeyWords: Photochemical vapor generation; Selenium; Formic acid; Germicidal lamp; Atomic fluorescenceDOI: 10.1016/j.sab.2016.10.007Citations: 10data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-05-31References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here