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24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal AgroParisTech université Paris-Saclay

Welcome to ECOSYS

UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes


Lafouge F., Decuq C., Zurfluh O., Bedos C., Genermont S., Loubet B.



Le PTRMS-QiTOF (Proton Transfer Reaction Mass Spectrometry - Quadripole Ion guide Time Of Flight) est une technique d'analyse chimique utilisée pour la mesure en continu des COVs dans l'air. Développée par l’Université d’Innsbruck (Autriche)[1] et par la société Ionicon[2], son principe repose sur 2 grandes étapes :(1)l’ionisation chimique douce par transfert de proton (H3O+) et (2) la séparation en fonction de la masse des ions produits et leur détection par un spectromètre de masse TOF.

On peut donc à l’aide de cette technique caracterisé un composé par un amas isotopique dépendant de l’abondance isotopique des atomes le constituant, le spectre de masse permet de déterminer précisément la masse des ions produits sans aboutir systématiquement à leur formule brute, la haute résolution en masse réduit le nombre d’hypothèses de formule brute, D’autres sources d’ionisation (NO+ ou O2+) permettent de discriminer certaines fonctions chimiques ou de détecter des molécules non protonables.

Le service PTRMS-QiTOF permet de quantifier les émissions et dépôts de COV dans les écosystèmes. Il permettra de réaliser des mesures en microcosmes, chambres in situ et à l'échelle de l'écosystème (flux par covariances turbulentes).

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