| Texto completo | |
| Autor(es): |
Fostier, Anne Helene
;
Amouroux, David
;
Tessier, Emmanuel
;
Viana, Jose Lucas Martins
;
Richter, Larissa
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | FRONTIERS IN ENVIRONMENTAL CHEMISTRY; v. 4, p. 11-pg., 2023-09-14. |
| Resumo | |
Methylmercury in soils and vegetation from the Amazonian rainforest is still poorly studied. Hence, the aim of this work was to determine the total mercury [THg] and methylmercury [MeHg] concentrations in litter and surface soil, MeHg deposition via litterfall, and the MeHg fate during a forest fire in the Amazonian rainforest. Sampling of litter, soil (0-1, 1-2, and 2-5 cm), and ash was carried out before (BB) and after (AB) a prescribed forest fire. The results showed a low [THg] (34 +/- 8 ng g-1) and [MeHg] (0.16 +/- 0.03 ng g-1) value in litter, with a correspondingly low estimate of the MeHg litterfall flux (0.13 +/- 0.03 mu gm-2 yr-1) which has been probably underestimated due to potential losses during the field experiment. In ashes, [THg] and [MeHg] values were 23 +/- 8 ng g-1 and 0.11 +/- 0.04 ng g-1, respectively. Although a significant part of Hg contained in the biomass was lost during the fire, the [MeHg]/[THg] ratio was not affected by it and was the same in litterfall and ash (similar to 0.5%). In soil, the average [THg] BB value was 149 +/- 12 ng g-1 in the three layers and [MeHg] was between 0.8 and 1.0 ng g-1. The forest fire only affected the superficial soil, with a significant decrease of [THg] and [MeHg] in the 0-1 cm layer. Similarly, the decrease of the [MeHg]/[THg] ratio in the surface soil layer suggested that MeHg was more readily emitted or degraded than the other Hg species present. (AU) | |
| Processo FAPESP: | 08/04490-4 - Combustão de biomassa de florestas tropicais |
| Beneficiário: | João Andrade de Carvalho Junior |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 10/19040-4 - Impacto do deflorestamento sobre as emissões de mercúrio em floresta tropical da região amazônica |
| Beneficiário: | Anne Helene Fostier |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/18124-4 - Fluxos, especiação e biodisponibilidade de arsênio na interface água/sedimento em lagoas alcalinas do Pantanal de Nhecolândia utilizando DGT |
| Beneficiário: | José Lucas Martins Viana |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |