Profiles of dissolved gaseous mercury concentration in the Mediterranean seawater

Ferrara, R.; Ceccarini, C.; Lanzillotta, E.; Gårdfeldt, Katarina; Sommar, Jonas; Horvat, Milena; Logar, M.; Fajon, Vesna; Kotnik, Jože

doi:10.1016/s1352-2310(03)00248-6

Cited by 46 publications

(18 citation statements)

References 33 publications

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“…The evasional flux of mercury generally shows a daily trend that mimics that of solar radiation intensity, reaching the maximum emission rates when the Photosintetically Active Radiation (PAR) reaches the maximum value, as observed by several authors (Ferrara et al, 2000;Ferrara et al, 2001;Ferrara et al, 2003;Gardfeldt et al, 2001;Lanzillotta and Ferrara, 2001;Andersson et al, 2007;Fantozzi et al, 2007). The efficiency of the process of mercury evasion depends not only on the intensity of the solar radiation, but also on the air and water temperatures.…”

Section: Resultsmentioning

confidence: 64%

“…Mercury fluxes were measured using a floating flux chamber connected to an atomic absorption analyzer, described elsewhere (Lanzillotta et al., 2003). Detailed descriptions of the devices used for the determination of DGM concentrations are reported in Ferrara et al (2003), Gardfeldt et al (2002) and . Table 1 summarizes the knowledge acquired as the result of investigations on the concentration of dissolved gaseous mercury in Mediterranean coastal waters and its flux to the atmosphere.…”

Section: Methodsmentioning

confidence: 99%

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Dissolved gaseous mercury and mercury flux measurements in Mediterranean coastal waters: A short review

Fantozzi

Ferrara

Sprovieri

2013

E3S Web of Conferences

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Abstract. There is a general agreement in the scientific community that the marine ecosystem can be a sink and/or source of the mercury that is cycling in the global environment, and current estimates of the global mercury budget for the Mediterranean region are affected by high uncertainty, primarily due to the little progress made so far in evaluating the role of chemical, physical and biological processes in the water system and in the lower atmosphere above the sea water (air-water interface). The lack of knowledge of the magnitude of the air-sea exchange mechanisms is, therefore, one of the main factors affecting the overall uncertainty associated with the assessment of net fluxes of Hg between the atmospheric and marine environments in the Mediterranean region. Results obtained during the last 15 years in the Mediterranean basin indicate the quantitative importance of such emission in the biogeochemical cycle of this element, highlighting the need for thorough investigations on the mechanisms of production and volatilization of dissolved gaseous mercury in waters.

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Section: Resultsmentioning

confidence: 64%

Section: Methodsmentioning

confidence: 99%

Dissolved gaseous mercury and mercury flux measurements in Mediterranean coastal waters: A short review

Fantozzi

Ferrara

Sprovieri

2013

E3S Web of Conferences

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“…Studies in marine waters suggest that biotic processes are most important and it is associated with phytoplankton activity. 16,[69][70][71] A positive potential correlation was found between percent saturation of dissolved oxygen and the percent of Hg 0 relative to the total Hg concentrations (r = 0.60, n = 94, P < 0.01). This result suggests that the Hg 0 production depends on primary production and is in agreement with other authors 3,69,70 who also showed relationships between primary productivity and Hg 0 concentrations in marine waters.…”

Section: Mercury Speciationmentioning

confidence: 89%

Mercury speciation changes in waters of the sepetiba Bay, SE Brazil during tidal events and different seasons

Paraquetti¹,

Lacerda²,

Almeida³

et al. 2007

J. Braz. Chem. Soc.

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Este estudo descreve as mudanças na especiação de Hg nas águas da Baía de Sepetiba, SE, Brasil, ao longo do gradiente estuarino, durante eventos de maré em diferentes estações. A avaliação química das águas da baía indicou uma exportação de material particulado em suspensão (MPS) pobre em carbono orgânico para a plataforma continental adjacente, principalmente durante a estação chuvosa e uma importação de MPS oceânico rico em carbono orgânico, provavelmente de origem fitoplanctônica, durante a estação seca. A especiação química do Hg demonstrou que a produção de Hg 0 na Baía de Sepetiba pode ser controlada pela produtividade primária, e que a baía atua como produtora e exportadora de formas orgânicas de Hg para as áreas adjacentes, já que as maiores concentrações de Hg não-reativo foram encontradas durante a maré vazante. Não foram observadas correlações significantes entre as concentrações de Hg não-reativo e carbono orgânico dissolvido ou particulado. Em geral, as frações de Hg particulado, Hg não-reativo e Hg reativo representam 55%, 35% e 9,5% do conteúdo total de Hg nas águas da Baía de Sepetiba, respectivamente.This work describes changes in Hg speciation in water along the transport from Sepetiba Bay, SE Brazil, to the adjacent continental platform during tide events and in different seasons. The chemical evaluation of Sepetiba Bay waters showed that the bay exports suspended particulate material (SPM) impoverish in organic carbon to adjacent continental platform areas, mainly during the wet season and imports SPM enriched in organic carbon from the ocean, probably of phytoplanktonic origin, during the dry season. The chemical speciation of Hg during the study period showed that Hg 0 production can be controlled by primary productivity and that the bay acts as a producer and exporter of organic species of Hg to adjacent areas, since the highest non-reactive Hg concentrations were observed during the ebb tide. No significant correlations were found between non-reactive Hg and dissolved or particulate organic matter concentrations. In general the particulate Hg, non-reactive Hg and reactive Hg fractions represents 55%, 35.5% and 9.5% of the total Hg content in Sepetiba Bay waters, respectively.Keywords: mercury speciation, coastal area, organic carbon, Sepetiba Bay IntroductionCoastal environments are complex and very dynamic systems showing a strong salinity gradient, high variation of suspended matter concentration and complex hydrodynamic processes. They act as links between the terrestrial and oceanic environments, present a large capacity to accumulate materials of continental and marine origin and are strongly affected by tidal events and continental hydrology. These environments are also characterized by land-sea gradients of physicochemical processes such as oxidation/reduction, sorption/desorption and precipitation/dissolution, which result in gradients of dissolved chemical species concentration, ionic force, pH and redox potential, which are responsible for the precipitation of the major part of ...

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“…Approximately 10-30 % of the Hg exists as elemental Hg in ocean water , where Hg 0 is mainly formed from the reduction of Hg (II) by aquatic microorganisms (Mason et al 1995) and from photoreduction of Hg (II) (Amyot et al 1997;Costa and Liss 2000) followed by geotectonic activity (Ferrara et al 2003;Horvat et al 2003). Abiotic methylation may take place in an environment loaded with humic organic matter (Weber 1993).…”

Section: Mercurymentioning

confidence: 99%

Harmful Elements in Estuarine and Coastal Systems

Khan

Masiol

Hofer

et al. 2014

PHEs, Environment and Human Health

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Estuaries and coastal zones are dynamic transitional systems which provide many economic and ecological benefits to humans, but also are an ideal habitat for other organisms as well. These areas are becoming contaminated by various anthropogenic activities due to a quick economic growth and urbanization. This chapter explores the sources, chemical speciation, sediment accumulation and removal mechanisms of the harmful elements in estuarine and coastal seawaters. It also describes the effects of toxic elements on aquatic flora and fauna. Finally, the toxic element pollution of the Venice Lagoon, a transitional water body located in the northeastern part of Italy, is discussed as a case study, by presenting the procedures adopted to measure the extent of the pollution, the impacts on organisms and the restoration activities.

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Profiles of dissolved gaseous mercury concentration in the Mediterranean seawater

Cited by 46 publications

References 33 publications

Dissolved gaseous mercury and mercury flux measurements in Mediterranean coastal waters: A short review

Dissolved gaseous mercury and mercury flux measurements in Mediterranean coastal waters: A short review

Mercury speciation changes in waters of the sepetiba Bay, SE Brazil during tidal events and different seasons

Harmful Elements in Estuarine and Coastal Systems

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