Garcia, E. et Amyot, M. et Ariya, P.A. (2005). Relationship between DOC photochemistry and mercury redox transformations in temperate lakes and wetlands. Geochimica et Cosmochimica Acta , 69 (8). pp. 1917-1924.
Ce document n'est pas hébergé sur Bibliothèque Électronique Lac Saint-Pierre.Résumé
We compared diurnal variations in dissolved gaseous mercury (DGM) concentration and in losses of dissolved organic carbon fluorescence (DOCF) in four boreal Canadian Shield lakes, in one beaver pond, and in filtered and unfiltered water from a wetland in Lake St. Pierre, a fluvial lake of the St. Lawrence River. These systems were chosen to represent a spectrum of DOC. We also determined the contribution of UVB, UVA and visible light on DGM photo-induced production in the four lakes. Our results showed a strong relationship between DGM concentrations and light intensity and between DGM production and losses in DOCF, in all study sites. We also observed higher rates of DGM formation and of DOCF bleaching in the presence of UV radiation. Under UVB light, production of DGM was higher in clear lakes than in the humic ones. Inversely, in the UVA range, DGM production tended to be higher in humic lakes. We suggest that DOCF bleaching can be used as a proxy for the rate of formation of reactive species that may alter the redox state of mercury in surface waters. We also have indications that DGM production is more important in clear than in humic waters.
| Type de document: | Article scientifique |
|---|---|
| Statut du texte intégral: | Autre |
| Mots-clés libres: | Diurnal variation, Lake, Mercury (element), Wetland |
| Sujets: | 2. Milieu physique > 2.4. Hydrologie 8. Impacts et monitoring > 8.1. Qualité de l’eau |
| Date de dépôt: | 08 juill. 2016 14:01 |
| Dernière modification: | 08 juill. 2016 14:01 |
| URI: | https://belsp.uqtr.ca/id/eprint/229 |
Gestion Actions (Identification requise)
 |
Dernière vérification avant le dépôt |
