Search results for: Paola Rivaro

Items from 1 to 17 out of 17 results

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Effects of the Atlantic water and glacial run-off on the spatial distribution of particulate trace elements in the Kongsfjorden

Andrea Bazzano, Francisco Ardini, Amanda Terol, Paola Rivaro, more

Marine Chemistry > 2017 > 191 > C > 16-23

Trace elements associated to suspended particulate matter have been investigated in the marine environment of Kongsfjorden (Svalbard Islands, Norwegian Arctic), in order to provide detailed information on their spatial variability and a quantitative assessment of the natural and anthropogenic sources. During a survey in July 2014, hydrographic and biogeochemical parameters were measured in addition...

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Physical and biological forcing of mesoscale variability in the carbonate system of the Ross Sea (Antarctica) during summer 2014

Paola Rivaro, Carmela Ianni, Leonardo Langone, Carlo Ori, more

Journal of Marine Systems > 2017 > 166 > C > 144-158

Water samples (0–200m) were collected in a coastal area of the Ross Sea in January 2014 to evaluate the physical and biological forcing on the carbonate system at the mesoscale (distance between stations of 5–10km). Remote sensing supported the determination of the sampling strategy and helped positioning each sampling station. Total alkalinity, pH, dissolved oxygen, phytoplankton pigments and composition...

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Trace elements in marine particulate and surface sediments of Kongsfjorden, Svalbard Islands

Francisco Ardini, Andrea Bazzano, Paola Rivaro, Francesco Soggia, more

Rendiconti Lincei > 2016 > 27 > 1 > 183-190

To investigate the occurrence and possible sources of trace metals in the marine environment of Kongsfjorden (Svalbard Islands, Norwegian Arctic), suspended particulate matter and surface sediments have been collected in July 2014 and analysed for major and trace elements. The sampling stations were chosen to be representative of different glacial runoff, anthropic impact and possible influence of...

article

Distribution and ventilation of water masses in the western Ross Sea inferred from CFC measurements

Paola Rivaro, Carmela Ianni, Emanuele Magi, Serena Massolo, more

Deep Sea Research Part I: Oceanographic Research Papers > 2015 > 97 > C > 19-28

During the CLIMA Project (R.V. Italica cruise PNRA XVI, January–February 2001), hydrographic and chlorofluorocarbons (CFCs) observations were obtained, particularly in the western Ross Sea. Their distribution demonstrated water mass structure and ventilation processes in the investigated areas. In the surface waters (AASW) the CFC saturation levels varied spatially: CFCs were undersaturated in all...

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Combined effects of hydrographic structure and iron and copper availability on the phytoplankton growth in Terra Nova Bay Polynya (Ross Sea, Antarctica)

Paola Rivaro, Maria Luisa Abelmoschi, Marco Grotti, Carmela Ianni, more

Deep-Sea Research Part I > 2012 > 62 > Complete > 97-110

Surface water (<100m) samples were collected from the Terra Nova Bay polynya region of the Ross Sea (Antarctica) in January 2006, with the aim of evaluating the individual and combined effects of hydrographic structure, iron and copper concentration and availability on the phytoplankton growth. The measurements were conducted within the framework of the Climatic Long Term Interaction for the Mass-balance...

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Using proteolytic enzymes to assess metal bioaccessibility in marine sediments

Antonello Bignasca, Carmela Ianni, Emanuele Magi, Paola Rivaro

Talanta > 2011 > 86 > Complete > 305-315

In this work we tested two proteolytic enzymes (trypsin and pepsin) to evaluate metal bioaccessibility in marine sediments. Some working conditions were studied, in particular incubation time, enzyme concentration and solution/solid ratio, and metals release mechanisms were investigated using both untreated and denatured enzymes.The results obtained with trypsin and pepsin were compared with each...

article

Distribution of dissolved labile and particulate iron and copper in Terra Nova Bay polynya (Ross Sea, Antarctica) surface waters in relation to nutrients and phytoplankton growth

Paola Rivaro, Carmela Ianni, Serena Massolo, M. Luisa Abelmoschi, more

Continental Shelf Research > 2011 > 31 > 7-8 > 879-889

The distribution of the dissolved labile and of the particulate Fe and Cu together with dissolved oxygen, nutrients, chlorophyll a and total particulate matter was investigated in the surface waters of Terra Nova Bay polynya in mid-January 2003. The measurements were conducted within the framework of the Italian Climatic Long-term Interactions of the Mass balance in Antarctica (CLIMA) Project activities...

article

Metal bioavailability in marine sediments measured by chemical extraction and enzymatic mobilization

Carmela Ianni, Antonello Bignasca, Emanuele Magi, Paola Rivaro

Microchemical Journal > 2010 > 96 > 2 > 308-316

In this work we compared metal bioavailable fractions in marine sediments operationally measured by sequential selective extractions (in particular the labile fraction released by acetic acid) and by a biomimetic approach using a commercially available proteolytic enzyme, proteinase K, chosen because of its non-specific behaviour and because it is representative of the enzymes encountered in many...

article

Distributions of carbonate properties along the water column in the Mediterranean Sea: Spatial and temporal variations

Paola Rivaro, Roberta Messa, Serena Massolo, Roberto Frache

Marine Chemistry > 2010 > 121 > 1-4 > 236-245

Surface and water column measurements of the total alkalinity and the pH were recorded in the Mediterranean Sea and in the Southern Tyrrhenian Sea from May–June 2007 and from November 2006 and February 2008, respectively. The measurements were conducted within the framework of the Italian VECTOR Research Project activities.The total alkalinity was measured using a potentiometric titration with an...

article

Chemical evidence of the changes of the Antarctic Bottom Water ventilation in the western Ross Sea between 1997 and 2003

Paola Rivaro, Serena Massolo, Andrea Bergamasco, Pasquale Castagno, more

Deep-Sea Research Part I > 2010 > 57 > 5 > 639-652

Data from three Italian CLIMA project cruises between 1997 and 2003 were used to obtain sections of the hydrographic and chemical properties of the main water masses across the shelf break off Cape Adare (western Ross Sea, Antarctica). Dissolved oxygen, nitrate and phosphate data were combined on the basis of the Redfield ratio to obtain the quasi-conservative tracers NO (9[NO ₃ ]+[O ₂...

article

Simultaneous determination of CFC-11, CFC-12 and CFC-113 in seawater samples using a purge and trap gas-chromatographic system

Serena Massolo, Paola Rivaro, Roberto Frache

Talanta > 2009 > 80 > 2 > 959-966

We have optimized the analytical parameters of a homemade instrument for the simultaneous measurement of the chlorofluorocarbons CCl ₂ F ₂ (CFC-12), CCl ₃ F (CFC-11) and C ₂ Cl ₃ F ₃ (CFC-113) in seawater. Seawater samples are flame sealed into 60ml glass ampoules avoiding any contact with the atmosphere and stored in cold, dark condition until analysis...

article

Annual and spatial variations of chemical and physical properties in the Ross Sea surface waters (Antarctica)

Serena Massolo, Roberta Messa, Paola Rivaro, Riccardo Leardi

Continental Shelf Research > 2009 > 29 > 20 > 2333-2344

Temperature, salinity, meltwater percentage, water column stability, dissolved oxygen and nutrients were measured in seawater samples collected at three fixed depths (0, 20, 100m) in 104 stations located in three different areas of the Ross Sea (Antarctica), during four Italian Antarctic surveys carried out between 1998 and 2006. Nutrient data were used to quantify the nutrient removal, which appears...

article

Mercury speciation in environmental samples by cold vapour atomic absorption spectrometry with in situ preconcentration on a gold trap

Paola Rivaro, Carmela Ianni, Francesco Soggia, Roberto Frache

Microchimica Acta > 2007 > 158 > 3-4 > 345-352

. A method has been developed for the determination of total and organic mercury in biological materials and sediments. A microwave assisted mineralization of the organic mercury, after its extraction from the matrix, is described. This procedure warrants complete transformation of Hg(II) and, consequently, the quantitative reduction to Hg(0). The conditions for mercury reduction were optimized by...

article

Temporal distribution of trace metals in Antarctic coastal waters

Marco Grotti, Francesco Soggia, Maria Luisa Abelmoschi, Paola Rivaro, more

Marine Chemistry > 2001 > 76 > 3 > 189-209

In the framework of the Italian Research Programme in Antarctica, a nearshore station positioned inside the Gerlache Inlet (Terra Nova Bay, Western Ross Sea) was regularly sampled during the Austral Spring 1997/1998, from November to February. In order to evaluate the physical, chemical and biological variations along the water column, measurements of a large number of parameters were performed at...

article

Determination of porphyrins and metalloporphyrins using liquid chromatography-diode array detection and mass spectrometry

Emanuele Magi, Carmela Ianni, Paola Rivaro, Roberto Frache

Journal of Chromatography A > 2001 > 905 > 1-2 > 141-149

A HPLC procedure has been optimized and successfully applied to porphyrins of environmental interest, such as etio and octaethylporphyrins and their VO and Ni compounds. The use of UV-Vis diode array allowed the detection of the analytes within the 5-15 ng/ml range. In order to achieve greater specificity and some structural information, the coupling of liquid chromatography with mass spectrometry...

article

Heavy Metals Distribution in the Eolian Basin (South Tyrrhenian Sea)

Paola Rivaro, Marco Grotti, Carmela Ianni, Emanuele Magi

Marine Pollution Bulletin > 1998 > 36 > 11 > 880-886

The concentration and distribution of heavy metals in the Eolian Basin are discussed. The data concern sediment and particulate matter samples and are correlated with the environmental parameters. In the sediments the measurements indicate that the elements (Zn, Pb, Co, Ni, Cr, Cu, Cd, Mn, Fe) display characteristics which seem not to be influenced by the various water masses circulating in the...

article

Seasonal variations in levels of butyltin compounds in mussel tissues sampled in an oil port

Paola Rivaro, Roberto Frache, Riccardo Leardi

Chemosphere > 1997 > 34 > 1 > 99-106

The aim of the present study has been to follow the seasonal variations of organotin compounds in the mussel (Mytilus galloprovincialis Lam.), under natural conditions in the Genoa oil port.To this purpose, mussels were sampled at one month intervals between 1994 and 1995 and the organotins were extracted from the whole body, the gills and the digestive glands.The determinations were carried out by...

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