Otimização e aplicação de câmaras para medição de fluxos de mercúrio gasoso dissolvido na interface água/atmosfera em lagos da bacia do Rio Negro - AM / Development, validation and application of chambers for mercury fluxes determinations in the water/atmosphere interface over lakes in the Negro River Basin - Amazon region - Brazil

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

31/08/2006

RESUMO

The scope of this work was the construction and optimization of fluxes chambers for the determination of dissolved gaseous mercury (DGM) in the water atmosphere interface, in lakes belonging to the Negro River basin - AM. Field work was carried out using a plexiglass flux chambers for the determination of inner and outer atmospheric gaseous mercury. The air was pumped through quartz gold-sand columns, preconcentrating the DGM by amalgamation. The mercury quantification was carried out by Cold Vapor Atomic Fluorescence Spectrometry (CVAFS), using equipment on boat. Inthe sampling period of January 2003, the DGM fluxes measured in Araca Lake (white waters) were -20.68, + 8.16 and - 0.54 pmol m-2 h-1, during a period without light incidence, and + 29.54, + 32.72 under light incidence. In the Iara Lake (black waters), the DGM fluxes were + 28.77, 19.00 and 22.35 without light incidence, and + 5.39, - 4.85 in light periods. The results suggest that DGM fluxes in white water lakes show na invasive behaviour in no light periods, as well as an evasive behaviour in light periods. However, the behaviour of DGM fluxes is opposite in black waters

ASSUNTO(S)

medidores de fluxo mercúrio resíduos de mercúrio flow measurements mercury mercury wastes negro rio (am)

ACESSO AO ARTIGO

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