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Applications de la vaporisation électrothermique couplée à la technique ICP-AES pour la détermination élémentaire dans les végétaux : une stratégie permettant l’analyse directe des échantillons à l’état solide

Abstract : Among the systems dedicated to the direct analysis of the solids, electrothermal vaporization takes up a place of choice. It offers several advantages. The preparation time of the samples is considerably reduced. There is no dilution induced by the digestion and the risks of losses or contaminations during this stage are eliminated. Its functioning consists to convert, by heating, a few milligrams of sample into an aerosol which is then transported in an inductively coupled plasma atomic emission spectrometer, where the elemental composition of the sample is determinate. A first fundamental study allowed to better understand the dynamics of the formed aerosol and to define the best operating conditions. However, the use of this technique to determine the elemental composition of solid plant samples presented additional difficulties: difficulty of calibration, matrix effects and important imprecision on the measured concentrations. The use of a cellulose support for the standard solutions allowed to harmonize the formation of the aerosol between the sample and the standard, and to obtain accurate results. The matrix effects can be considerably reduced by a preliminary dry-ashing of the samples. The variability of measurements, caused by the lack of homogeneity of the samples, was limited by reducing significantly the size of the solid particles. These results, obtained on powders, allowed other applications as the analysis of whole plant samples or the imaging of the chemical composition of plant organs.
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https://hal.inrae.fr/tel-03132977
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Submitted on : Friday, February 5, 2021 - 3:24:23 PM
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Pierre Masson, Rapporteurs Beauchemin. Applications de la vaporisation électrothermique couplée à la technique ICP-AES pour la détermination élémentaire dans les végétaux : une stratégie permettant l’analyse directe des échantillons à l’état solide. Chimie. Université de Pau et des Pays de l'Adour, 2014. Français. ⟨tel-03132977⟩

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