Optimization of the electron spin resonance spectrometric determination of transition-metal ions by variation of temperature

The effect of variation in temperature on the first-derivative electron spin resonance spectra of transition metal ions in aqueous solution is reported. For the aquo ions of Mn(II), Cr(III), Fe(III) and vanadyl, and for hexafluoroferrate(III), an increase in temperature results in a decrease in line...

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Bibliographic Details
Published in:Analytica chimica acta 1989, Vol.218 (1), p.93-100
Main Authors: Burns, D.Thorburn, Dalgarno, Barry G., Flockhart, Brian D.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
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Summary:The effect of variation in temperature on the first-derivative electron spin resonance spectra of transition metal ions in aqueous solution is reported. For the aquo ions of Mn(II), Cr(III), Fe(III) and vanadyl, and for hexafluoroferrate(III), an increase in temperature results in a decrease in line width with a concomitant increase in signal amplitude. In contrast, [Cu(H 2O) 6] 2+ and [Ti (H 2O) 4F 2] + show an increase in line width and a marked decrease in derivative amplitude as the temperature is raised. Consequently, the choice of the optimum temperature for each system results in greatly improved sensitivity and lower limits of detection. Recording spectra at more than one temperature is also useful for detecting a given metal ion in a multicomponent system that has overlapping resonance lines.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(00)80286-X