Agenzia Regionale per la Protezione dellAmbiente Del Friuli Venezia Giulia ARPA FVG

Palmanova, Italy

Agenzia Regionale per la Protezione dellAmbiente Del Friuli Venezia Giulia ARPA FVG

Palmanova, Italy
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Bagnato E.,University of Perugia | Oliveri E.,CNR Institute for Coastal Marine Environment | Acquavita A.,Agenzia Regionale per la Protezione dellAmbiente del Friuli Venezia Giulia ARPA FVG | Covelli S.,University of Trieste | And 5 more authors.
Marine Chemistry | Year: 2016

There is a growing concern about the mercury (Hg) vented from submarine hydrothermal fluids to the marine surrounding and exchange of dissolved gaseous mercury (DGM) between the sea surface and the atmosphere. A geochemical survey of thermal waters collected from submarine vents at Panarea Island (Aeolian Islands, southern Italy) was carried out in 2015 (15-17th June and 17-18th November), in order to investigate the concentration of Hg species in hydrothermal fluids and the vertical distribution in the overlying water column close to the submarine exhalative area. Specific sampling methods were employed by Scuba divers at five submarine vents located along the main regional tectonic lines. The analysis of the hydrothermal fluids indicates a site-to-site variation, with filtered total mercury (FTHg) concentrations ranging from 1072 to 4711pM, as a consequence of the gas bubbles partial dissolution. These results are three orders of magnitude higher than the FTHg concentrations found in the overlying seawater column (ranging from 5.3 to 6.3pM in the mid waters), where the efficient currents and vertical mixing result in more dilution, and potentially rapid transfer of the dissolved gaseous Hg to the atmosphere. Dissolved gaseous mercury (DGM) and gaseous elemental mercury (GEM) were simultaneously measured and combined in a gas-exchange model to calculate the sea-air Hg0 evasional flux. Based on the data of DGM (range: 0.05-0.22pM) and atmospheric GEM (range: 1.7±0.35-6.4±2.6ngm-3), we argue that the surface seawater off Panarea is mostly supersaturated in dissolved elemental gaseous mercury compared to the atmosphere, with a sea-air Hg0 net flux ranging from 0.7 to 9.1ngm- 2 h-1 (average: ~4.5±3.5ngm- 2 h-1). Since the empirical gas-exchange model does not include the contribution of Hg0 released as gas bubbles rising from the vents toward sea-surface, the calculated Hg0 evasional flux for this location is most likely larger. © 2017 Elsevier B.V.


Acquavita A.,Agenzia Regionale per la Protezione dellAmbiente Del Friuli Venezia Giulia ARPA FVG | Acquavita A.,Dell | Aleffi I.F.,Agenzia Regionale per la Protezione dellAmbiente Del Friuli Venezia Giulia ARPA FVG | Benci C.,Agenzia Regionale per la Protezione dellAmbiente Del Friuli Venezia Giulia ARPA FVG | And 8 more authors.
Regional Studies in Marine Science | Year: 2015

A 1-year cycle of physico-chemical measurements was conducted in the Marano and Grado Lagoon (Adriatic Sea, Italy) with the aim to assess its trophic state. Some selected variables (nutrients, chlorophyll a, dissolved oxygen, temperature and salinity) were used to describe the system within the application of the Water Framework Directive (WFD) and to compare it with other Mediterranean environments. From an ecological point of view the Marano and Grado Lagoon is one of the best conserved wetlands in the whole Mediterranean area and is protected by several European environmental pieces of legislation. However, the neighbouring mainland hosts several socio-economic activities which can affect its water quality. The results obtained in this work highlighted considerable spatial and temporal variability of physico-chemical parameters. Specifically, a large amount of anthropogenic nutrients, mainly in form of nitrogen (N), was carried from inland through river discharges in the Marano basin (western sector). However, these inputs were offset by the water exchange with the adjacent open sea, which exerted a dynamic dilution effect, and induced low water residence time thus limiting nutrients enrichment and their accumulation for long time periods. The Molar Redfield ratio (DIN/SRP) was always higher than the optimum value of 16 (in some cases it was up to 2000), thus suggesting that the system is phosphorus (P) limited, as confirmed by low chlorophyll a content, rare algal blooms and good water oxygenation. Trophic state indices and threshold values (EEA method, Carlson Trophic Index, TRIX and ASSETS) were applied. A broad range of classes was found (from oligotrophic to hypertrophic depending on water bodies, method applied and period of the year), thus suggesting that an over simplification of this complex ecosystem should be avoided. Further studies will be conducted in order to define the Lagoon's ecological status sensu WFD and the adequate management implications. © 2015 Elsevier B.V. All rights reserved.


Acquavita A.,Agenzia Regionale per la Protezione dellAmbiente del Friuli Venezia Giulia ARPA FVG | Falomo J.,Agenzia Regionale per la Protezione dellAmbiente del Friuli Venezia Giulia ARPA FVG | Predonzani S.,Agenzia Regionale per la Protezione dellAmbiente del Friuli Venezia Giulia ARPA FVG | Tamberlich F.,Agenzia Regionale per la Protezione dellAmbiente del Friuli Venezia Giulia ARPA FVG | And 2 more authors.
Marine Pollution Bulletin | Year: 2014

The Marano and Grado Lagoon is one of the best conserved transitional environment in the whole Mediterranean area. On the other hand, it suffers from industrial, agricultural and fisheries activities, which could have an important impact on its environmental quality. With the application of the WFD, the sediment chemical status was investigated. In this work, 16 polycyclic aromatic hydrocarbons included by the US EPA within the priority pollutants were considered. PAHs values ranged from non-detectable to 1056ngg-1 showing the highest contamination close to the Aussa-Corno River mouth, which received the industrial inputs. The contamination level was comparable to that observed in low contaminated sites of the Mediterranean region, and lower than the adjacent Gulf of Trieste. The ratios of selected PAHs congeners pointed out the prevalence of pyrolitic sources. Moreover, the application of the ERL/ERM displayed an environment, which should not have a potential biological impact. © 2014 Elsevier Ltd.


PubMed | Agenzia Regionale per la Protezione dellAmbiente del Friuli Venezia Giulia ARPA FVG
Type: Journal Article | Journal: Marine pollution bulletin | Year: 2014

The Marano and Grado Lagoon is one of the best conserved transitional environment in the whole Mediterranean area. On the other hand, it suffers from industrial, agricultural and fisheries activities, which could have an important impact on its environmental quality. With the application of the WFD, the sediment chemical status was investigated. In this work, 16 polycyclic aromatic hydrocarbons included by the US EPA within the priority pollutants were considered. PAHs values ranged from non-detectable to 1056 ng g(-1) showing the highest contamination close to the Aussa-Corno River mouth, which received the industrial inputs. The contamination level was comparable to that observed in low contaminated sites of the Mediterranean region, and lower than the adjacent Gulf of Trieste. The ratios of selected PAHs congeners pointed out the prevalence of pyrolitic sources. Moreover, the application of the ERL/ERM displayed an environment, which should not have a potential biological impact.

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