1,721,011 research outputs found
Analysis of local and regional sources of respirable particulate matter in Venice using PIXE, ion chromatography and chemometric approaches
No full textSize resolved elemental composition of aerosol in a semi-rural coastal site at the rim of Po Valley, Italy. Preliminary results: general geochemical characteristics and the most probable sources
Full text linkChanges in PM10 Composition in Venice Area During Clean and Polluted Periods: a Source Apportionment Study Coupled with SEM-EDS Individual Particle Analysis
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Atmospheric Aerosol at the Svalbard Islands in Year 2010. A Preliminary Analysis of Multielemental Data from Size-Segregated Samples: (I) Sea-Salt Components
Full text linkAtmospheric Aerosol at the Svalbard Islands in Year 2010. A Preliminary Analysis of Multielemental Data from Size-Segregated Samples: (III) Crustal Elements and Minor Elements
Full text linkThe mass size distribution of aerosol in a coastal site of Po Valley (Italy): local and external origins of elemental composition
No full textRelazione tra la circolazione atmosferica e le distribuzioni dimensionali di alcuni elementi nell'aerosol di Venezia
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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
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