Mercury Redox Chemistry in the Negro River Basin, Amazon: The Role of Organic Matter and Solar Light

dc.creatorJardim, WF
dc.creatorBisinoti, MC
dc.creatorFadini, PS
dc.creatorda Silva, GS
dc.date2010
dc.dateMAR
dc.date2014-11-17T01:55:43Z
dc.date2015-11-26T16:35:12Z
dc.date2014-11-17T01:55:43Z
dc.date2015-11-26T16:35:12Z
dc.date.accessioned2018-03-28T23:17:37Z
dc.date.available2018-03-28T23:17:37Z
dc.identifierAquatic Geochemistry. Springer, v. 16, n. 2, n. 267, n. 278, 2010.
dc.identifier1380-6165
dc.identifierWOS:000275634400005
dc.identifier10.1007/s10498-009-9086-z
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/53608
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/53608
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/53608
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1271440
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionPristine water bodies in the Negro River basin, Brazilian Amazon, show relatively high concentrations of mercury. These waters are characterized by acidic pH, low concentrations of suspended solids, and high amounts of dissolved organic matter and are exposed to intense solar radiation throughout the year. This unique environment creates a very dynamic redox chemistry affecting the mobility of mercury due to the formation of the dissolved elemental species (Hg-0). It has been shown that in this so-called black water, labile organic matter from flooded forest is the major scavenger of photogenerated H2O2. In the absence of hydrogen peroxide, these black waters lose their ability to oxidize Hg-0 to Hg2+, thus increasing Hg-0 evasion across the water/atmosphere interface, with average night time values of 3.80 pmol m(-2) h(-1). When the dry period starts, labile organic matter inputs gradually diminish, allowing the increasing concentration of H2O2 to re-establish oxidative water conditions, inhibiting the metal flux across the water/atmosphere interface and contributing to mercury accumulation in the water column.
dc.description16
dc.description2
dc.descriptionSI
dc.description267
dc.description278
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageen
dc.publisherSpringer
dc.publisherNew York
dc.publisherEUA
dc.relationAquatic Geochemistry
dc.relationAquat. Geochem.
dc.rightsfechado
dc.rightshttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dc.sourceWeb of Science
dc.subjectAmazon
dc.subjectMercury
dc.subjectRedox chemistry
dc.subjectNegro river
dc.subjectSolar light
dc.subjectDissolved Gaseous Mercury
dc.subjectAquatic Humic Substances
dc.subjectPhotochemical Formation
dc.subjectHydrogen-peroxide
dc.subjectElemental Mercury
dc.subjectVolatile Mercury
dc.subjectTemperate Lakes
dc.subjectNatural-waters
dc.subjectBehavior
dc.subjectVariability
dc.titleMercury Redox Chemistry in the Negro River Basin, Amazon: The Role of Organic Matter and Solar Light
dc.typeArtículos de revistas


Este ítem pertenece a la siguiente institución