2009
DOI: 10.1590/s0103-50532009000800023
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Abstract: Consumo/formação de mercúrio dissolvido gasoso (MDG) foi medido durante campanhas na Bacia do Rio Negro, Amazônia, Brasil. Foram realizadas medidas diuturnas em águas brancas e pretas. Em águas brancas, pH próximo a 7 e baixa concentração de carbono orgânico dissolvido (DOC), a saturação de MDG prevalece no período iluminado, similar a outras regiões do planeta. Esta geração de MDG foi atribuída à redução fotoinduzida do Hg ), a concentração de MDG permanece abaixo do limite de detecção no período iluminado, o… Show more

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Cited by 4 publications
(3 citation statements)
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References 26 publications
(34 reference statements)
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“…Another possible photoactive oxidizing species ubiquitous in natural waters is nitrate, which could also play an important role as an elemental mercury scavenger. In a recent work, Silva et al (2009) used spiked photochemical experiments to confirm the atypical behavior of DGM in black waters from this area, corroborating the negative correlation between DGM formation and solar radiation during dry period, contrary to most studies published with sunlit waters. However, a similar mercury oxidation mechanism is discussed in the literature (Lalonde et al 2004).…”
Section: Resultsmentioning
confidence: 71%
See 1 more Smart Citation
“…Another possible photoactive oxidizing species ubiquitous in natural waters is nitrate, which could also play an important role as an elemental mercury scavenger. In a recent work, Silva et al (2009) used spiked photochemical experiments to confirm the atypical behavior of DGM in black waters from this area, corroborating the negative correlation between DGM formation and solar radiation during dry period, contrary to most studies published with sunlit waters. However, a similar mercury oxidation mechanism is discussed in the literature (Lalonde et al 2004).…”
Section: Resultsmentioning
confidence: 71%
“…Field detection limits varied between 27 and 45 fmol L -1 . QA/QC details of this determination were described in previous works (Silva et al 2006;Silva et al 2009), with a coefficient of variation ranging between 8.1 and 16.8%. Gold sand traps were also used in the atmospheric air collection.…”
Section: Water Sampling and Chemical Analysismentioning
confidence: 99%
“…69 Por analogia, se a presença de sulfetos pode ser utilizada como indicador de quantidades seguras de prata, já que a sua solubilidade nessa situação seria de 2,2 x 10 -17 mol L -1 , a mesma regra deveria valer para o mercúrio, que apresenta uma constante do produto de solubilidade igual a 1,6 x 10 -54 e solubilidade de 1,6 x 10 -27 mol L -1 , que é dez ordens de magnitude menor do que a da prata. No entanto, o mercúrio, um metal que apresenta um ciclo biogeoquímico complexo, [70][71][72][73] apresenta particularidades que tornam esta avaliação bastante intrincada.…”
Section: Mecanismos De Interação Metal -Sedimentounclassified