, Cependant, il n'y a pas de données d'observation pour étayer ces résultats et d'autres expériences sont nécessaires, cette fois ci en phase gazeuse
, Les isotopes stables du mercure se sont révélés utiles pour comprendre les mécanismes de réduction du mercure. Le prochain défi consiste à effectuer des analyses isotopiques du mercure similaires sur la photolyse du composé gazeux du Hg
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, France Résumé: La photoréduction atmosphérique du Hg pourrait avoir lieu à la fois en phase gazeuse et aqueuse. Les taux de photoréduction du Hg(II) que nous observons dans l'eau de pluie, en condition d'ensoleillement total, sont d'un ordre de grandeur inférieur au taux optimisé de photoréduction dans les nuages >1.0 h -1 dans les modèles globaux de mercure. La photoréduction aqueuse de mercure dans l'atmosphère est trop lente pour constituer une voie de réduction dominante, Les formes HgBr2, HgCl2, HgBrNO2, HgBrHO2 gazeuses atmosphériques, balayées par les aérosols aqueux et les gouttelettes de nuages, sont converties en formes de Hg(II)-DOC dans les précipitations en raison de l'abondance de carbone organique dans les aérosols et de l'eau de nuages. Des calculs théoriques montrent que les taux de photolyse en phase gazeuse de composés de mercure
, Mots clés: Mercure, eau de pluie, taux de photoréduction, phase gazeuse, phase aqueuse, modèle atmosphérique Abstract: Atmospheric Hg photoreduction could take place in both gas-and aqueous phase. Rainwater Hg(II) photoreduction rates
, Atmospheric gaseous HgBr2, HgCl2, HgBrNO2, HgBrHO2 forms, scavenged by aqueous aerosols and cloud droplets, are converted to Hg(II)-DOC forms in rainfall due to abundant organic carbon in aerosols and cloud water, Computation of gas phase photolysis rates of Hg(II) compounds can be fast, and is fast enough to rebalance the modeled atmospheric Hg cycle between Hg(0) oxidation and Hg
, Keywords: Mercury, rain water, photoreduction rate, gas phase, aqueous phase, atmospheric model