Publications des scientifiques de l'IRD

Quiroga-Flores R., Guédron Stéphane, Acha D. (2021). High methylmercury uptake by green algae in Lake Titicaca : potential implications for remediation. Ecotoxicology and Environmental Safety, 207, p. 111256 [6 p.]. ISSN 0147-6513.

Titre du document
High methylmercury uptake by green algae in Lake Titicaca : potential implications for remediation
Année de publication
2021
Type de document
Article référencé dans le Web of Science WOS:000592461400002
Auteurs
Quiroga-Flores R., Guédron Stéphane, Acha D.
Source
Ecotoxicology and Environmental Safety, 2021, 207, p. 111256 [6 p.] ISSN 0147-6513
Anthropogenic pressure in the high altitude lakes such as Titicaca and Uru (Bolivia) may favor the production of methylmercury (MeHg) known to accumulate in trophic chains. Periphyton associated with emerged aquatic plants (totoras) from the lake shores accumulates and demethylates MeHg providing a potential cost-effective water treatment technique. In this laboratory study, we measured the MeHg uptake kinetics of a consortium of green algae isolated from Lake Titicaca totora's periphyton. The most abundant algal consortium, composed of Oedogonium spp., Chlorella spp., Scenedesmus spp., was exposed to rising MeHg concentrations (from 5 to 200 ng.L-1) to assess their maximum potential capacity for MeHg accumulation. Various algal biomass concentra-tions were tested to choose the optimal one. Results provided a net MeHg uptake rate by this algal consortium of 2.38 amol ng(-1).h(-1).nM(-1) (the total uptake was 2863 ng MeHg.g(-1)) for an initial concentration of 200 ng MeHg.L-1 with an algal biomass concentration of 0.02 g.L-1. This initial MeHg concentration is 1000 times higher than the one measured in the eutrophic Cohana Bay of Lake Titicaca, which shows the high accumulation potential of these green algae. Our data suggest that periphyton has a high potential for the treatment of Hg contaminated waters in constructing wetlands in the Andean Altiplano.
Plan de classement
Pollution [038]
Description Géographique
BOLIVIE ; TITICACA LAC
Localisation
Fonds IRD [F B010080421]
Identifiant IRD
fdi:010080421
Contact
  • Coordonnées :
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    93140 Bondy Cedex
    France
    Horizon Pleins textes
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