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24, chemin de Borde Rouge –Auzeville – CS52627
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Dernière mise à jour : Mai 2018

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Soil Science Research Unit

(currently in translation) Spectrométrie d’absorption atomique

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Le spectromètre d’absorption atomique se compose d’une source lumineuse dont le faisceau traverse un dispositif thermique (flamme ou four en graphite) dans lequel l’élément à doser se trouve porté à l’état atomique. Il permet de doser les métaux présents à l’état de trace dans les sols.

Spectromètre © INRA


C’est une technique d’analyse relative et quantitative des éléments à faibles teneurs. Le principe est basé sur l’absorption de lumière par les éléments présents dans une solution. Pour doser l’élément, celui-ci doit être sous forme d’atomes libres. L’échantillon est donc porté à une température de 2000 °C afin de dissocier les combinaisons chimiques dans lesquelles les éléments présents se trouvent. On accède ainsi à une quantification globale de chaque élément analysé.
Un étalonnage (à l’aide de 6 à 8 solutions étalons) est réalisé avant chaque passage de séries d’échantillons.
Le logiciel SOLAAR assure le contrôle du fonctionnement.


Quelques microlitres d’échantillon sont déposés à l’aide d’un passeur automatique.