1,721,030 research outputs found
Caratterizzazione geochimica dell'aerosol naturale e di background nell'area costiera della Laguna di Venezia attraverso l'utilizzo di nuove tecnologie applicate all'ambiente
No full textCaratterizzazione geochimica dell'aerosol naturale e di background nell'area costiera della laguna di Venezia attraverso l'utilizzo di nuove tecnologie applicate all'ambiente
No full textParticolato atmosferico e ambiente mediterraneo. Il caso delle polveri sahariane.
No full textIl volume evidenzia l’importanza che il particolato atmo-
sferico assume in ambiti diversi (sedimentazione marina,
variazioni climatiche, salute dell’uomo). Nonostante sia
recente il riconoscimento nella letteratura scientifica del-
l’importanza dei trasporti di polveri desertiche, il tema sta
ora assumendo sempre più rilievo alla luce dei cambia-
menti climatici globali in atto e con l’estendersi della deser-
tificazione. Gli argomenti trattati spaziano dall’analisi delle
principali sorgenti alla valutazione quantitativa dei flussi
di polveri. La caratterizzazione dei traccianti è collegata
alla sedimentazione marina, mentre attraverso lo studio di
carote di ghiaccio vengono svolte considerazioni sull’inte-
razione polveri-clima. Aspetti originali sul ruolo delle pol-
veri Sahariane nelle concentrazioni di PM10 e PM2,5 con-
cludono il volume. Il testo, unico nel suo genere in lingua
italiana, si rivolge agli studenti ma può risultare utile anche
ai ricercatori per la visione multidisciplinare con cui è
affrontato l’argomento
Sviluppo di algoritmi algebrici per generare automaticamente mappe granulometriche dei sedimenti della Laguna di Venezia.
No full textDevelopment of algebra algorithms for automated generation of grain-size distribution maps
Full text linkThe grain-size distribution of sediments is a fundamental characteristic in understanding the earth’s surface environments and an essential tool in classifying sedimentary environments. Grain-size data provide important information on the energy and dynamics of depositional environments and aid our understanding of sediment transport. Ternary diagrams (TD) are useful and conventional tools to classify sediments on the basis of relative grain-size (i.e., gravel, sand, mud or sand, silt, clay). The development of spatial modelling in a Geographical Information System (GIS) can assist in treating, computing and displaying sedimentological data, such as grain-sizes. The grain-size distribution of sediments is a fundamental characteristic in understanding the earth’s surface environments and an essential tool in classifying sedimentary environments. Grain-size data provide important information on the energy and dynamics of depositional environments and aid our understanding of sediment transport. Ternary diagrams (TD) are useful and conventional tools to classify sediments on the basis of relative grain-size (i.e., gravel, sand, mud or sand, silt, clay). The development of spatial modelling in a Geographical Information System (GIS) can assist in treating, computing and displaying sedimentological data, such as grain-sizes
Analysis of airborne particulate matter with the combined use of particle induced X-ray emission, ion chromatography and scanning electron microscopy
No full textAbstract
The increasing atmospheric pollution is one of the most worrying problems in the
world. Adverse health effects are associated to the air concentration of particulate
matter with aerodynamic diameter less than 10 μm (PM10). The PM10 mass per m3 of
air is one of the most important parameters used to estimate the air quality in Europe,
since the European Directive 1999/30/EC became effective.
This study presents the results of individual particle analyses performed on PM10
samples with different source contributions. The main objective is to characterize the
chemical and mineralogical composition of the particulate matter in a coastal site
near Venice, Italy. An extended PM10 sampling campaign was performed and
concentrations of fifteen elements (Na, Mg, Al, Si, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu,
Zn) and six inorganic ions (Cl−, NO3
−, SO4
2-, Na+, Mg2+, NH4
+) were determined
using Particle Induced X-ray Emission (PIXE) and ion chromatography of watersoluble
fractions, respectively.
A varimax rotated factor analysis followed by a multi-linear regression analysis were
performed on chemical data and five PM10 sources were identified and quantified:
mineral dust, sea-salt, fossil fuel combustion, mixed anthropogenic pollution and
secondary inorganic aerosol.
A number of samples with very different source contributions to the daily levels of
PM10 were also selected and an individual particle analysis by Scanning Electron
Microscopy combined with Energy-Dispersive X-ray Spectrometry (SEM-EDS) was
performed. Six different classes of particles were identified (mineral particles,
chlorides, sulfates, elemental and organic carbon compounds, metals and biological
particles) and an estimation of their abundance was made. Results show a
relationship between source apportionment contributions and individual particle
composition. This allows to extract further information on PM10 composition, source
contributions, morphology, mineralogy and mixed state of particles and demonstrates
the effectiveness of coupling the two approaches.
Acknowledgement
The authors gratefully acknowledge the support provided by Prof. P. Mittner (FISAMB-PD)
and Laboratori Nazionali Legnaro – Istituto Nazionale di Fisica Nucleare (LNL-INFN) for
PIXE and electron microscopy facilities, Dr. E. Ghedini, Prof. F. Pinna and Dr. M. Signoretto
(Università Ca’ Foscari Venezia) for ion chromatography. The authors are also grateful to
Comando Zona Fari e Segnalamenti Marittimi di Venezia for logistics
Gaseous and PM10-Bound Pollutants Monitored in Three Sites with Differing Environmental Conditions in the Venice Area (Italy)
No full textUnderstanding and controlling air pollution in highly populated areas is very important, although interpreting the levels of gaseous pollutants and airborne particulate matter is complicated by dominant natural and anthropogenic emissions, micro-meteorological processes, and chemical reactions which take place directly in the atmosphere. For this reason, it is very difficult to relate the characteristics of air pollution to one or more specific emission sources. The aim of this paper is to detect associations among elements and organic compounds emitted from specific sources by means of chemical analyses, statistical processing of data, seasonal evolution study, and geochemical considerations to trace their origin. A detailed characterization of air quality during the period September 2000–September 2001 was carried out in three locations of the Venice region: A heavy traffic urban site, a public park, and the island centre of the city of Venice. Twenty-eight inorganic elements, four polycyclic aromatic hydrocarbons, CO and benzene were quantified and processed by a statistical procedure based on factor analysis considering variations on a seasonal basis. Results show the presence of associations between elements and compounds with the same behaviour in all sampling points. This indicates that several pollutants originate from a common source, and are then “diluted” throughout the study area, maintaining the imprint of their origin. Pt, polycyclic aromatic hydrocarbons, CO and benzene originating from the exhaust gas of vehicles are all linked in the traffic factor, whereas Cd is associated with Se, having a common source in industrial processes
Sedimentological variability and bathymetric changes of the Lagoon of Venice in the last 30 years.
No full textElemental characterization of PM2.5 in different environmental condition in the Venice area
No full textGeochemical characterization of PM10 emitted by glass factories in Murano, Venice (Italy)
No full textTrace metals, Polycyclic aromatic hydrocarbons, Lagoon of Venice, Glass manufacturin
- …
