Dissolved gaseous mercury (DGM) formation/consumption was measured during several scientific excursions in the Negro River basin, Amazon, Brazil. Measurements were carried out following diel patterns in both white and black water bodies. In white waters, with pH values around 7 and low dissolved organic carbon (DOC) concentration, mercury saturation prevails during the sunlit period, similar to behavior observed elsewhere. This was attributed to DGM generated by a photoinduced mechanism of Hg2+ reduction. On the other hand, in black waters, with pH around 5 and high DOC values (up to 20 mg L-1), DGM concentration stays below the detection limit during sunlit periods, which was associated to photoinduced Hg-0 oxidation. Photochemical experiments carried out ill situ corroborate the influence of sunlight on DGM formation/consumption. A comparison of diel DGM saturation is presented for both black and white water bodies.
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Minist Hlth, Oswaldo Cruz Fdn, Inst Oswaldo Cruz, Rio De Janeiro, BrazilMinist Hlth, Oswaldo Cruz Fdn, Inst Oswaldo Cruz, Rio De Janeiro, Brazil
Cabral, A. C.
Fe, N. F.
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Amazonas Fdn Trop Med, Amazonas, BrazilMinist Hlth, Oswaldo Cruz Fdn, Inst Oswaldo Cruz, Rio De Janeiro, Brazil
Fe, N. F.
Suarez-Mutis, M. C.
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Minist Hlth, Oswaldo Cruz Fdn, Inst Oswaldo Cruz, Rio De Janeiro, BrazilMinist Hlth, Oswaldo Cruz Fdn, Inst Oswaldo Cruz, Rio De Janeiro, Brazil
Suarez-Mutis, M. C.
Boia, M. N.
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Minist Hlth, Oswaldo Cruz Fdn, Inst Oswaldo Cruz, Rio De Janeiro, Brazil
Univ Estado Rio De Janeiro, Fac Med Sci, Rio De Janeiro, BrazilMinist Hlth, Oswaldo Cruz Fdn, Inst Oswaldo Cruz, Rio De Janeiro, Brazil
Boia, M. N.
Carvalho-Costa, F. A.
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Minist Hlth, Oswaldo Cruz Fdn, Inst Oswaldo Cruz, Rio De Janeiro, BrazilMinist Hlth, Oswaldo Cruz Fdn, Inst Oswaldo Cruz, Rio De Janeiro, Brazil
机构:
Jozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, SloveniaJozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, Slovenia
Kotnik, Joze
Horvat, Milena
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Jozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, SloveniaJozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, Slovenia
Horvat, Milena
Begu, Ermira
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Jozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, SloveniaJozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, Slovenia
Begu, Ermira
Shlyapnikov, Yaroslav
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Jozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, SloveniaJozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, Slovenia
Shlyapnikov, Yaroslav
Sprovieri, Francesca
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CNR IIA, Inst Atmospher Pollut, I-87036 Arcavacata Di Rende, ItalyJozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, Slovenia
Sprovieri, Francesca
Pirrone, Nicola
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CNR IIA, Inst Atmospher Pollut, I-87036 Arcavacata Di Rende, ItalyJozef Stefan Inst, Dept Environm Sci, Jamova 39, SI-1000 Ljubljana, Slovenia
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Inst Jozef Stefan, Dept Environm Sci, Jamova Cesta 39, SI-1000 Ljubljana, SloveniaInst Jozef Stefan, Dept Environm Sci, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia
Kotnik, Joze
Zagar, Dusan
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Univ Ljubljana, Fac Civil & Geodet Engn, Jamova Cesta 2, SI-1000 Ljubljana, SloveniaInst Jozef Stefan, Dept Environm Sci, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia
Zagar, Dusan
Novak, Gorazd
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Univ Ljubljana, Fac Civil & Geodet Engn, Jamova Cesta 2, SI-1000 Ljubljana, SloveniaInst Jozef Stefan, Dept Environm Sci, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia
Novak, Gorazd
Licer, Matjaz
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Slovenian Environm Agcy, Vojkova 1b, SI-1000 Ljubljana, Slovenia
Natl Inst Biol, Marine Biol Stn Piran, Fornace 41, SI-6330 Piran, SloveniaInst Jozef Stefan, Dept Environm Sci, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia
Licer, Matjaz
Horvat, Milena
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Inst Jozef Stefan, Dept Environm Sci, Jamova Cesta 39, SI-1000 Ljubljana, SloveniaInst Jozef Stefan, Dept Environm Sci, Jamova Cesta 39, SI-1000 Ljubljana, Slovenia