1,720,999 research outputs found
Correlation among some inorganic and arganic elements in the particulate matter (PM10) in the area of Venezia - Mestre
No full textInorganic Geochemical Indicators in Glacial Marine Sediments :Applications to the Paleoclimatic Fluctuations Recorded by Late Quaternary Squences in Antartica
No full textSource apportionment of chemically resolved PM2.5 and particle size spectra collected downwind of London Heathrow (UK)
No full textCaratterizzazione geochimica del particolato fine (PM2.5) in siti dell'area veneziana con differenti condizioni ambientali
No full textL’elevato interesse per il particolato atmosferico è legato principalmente agli effetti sulla salute umana e al ruolo giocato sugli ecosistemi, sul clima ed sull’alterazione dei materiali. Diviene quindi di primaria importanza individuare la composizione chimica e i principali processi di origine del particolato.
Lo scopo di questo lavoro è stato quello di caratterizzare il particolato atmosferico dell’area di studio attraverso considerazioni di tipo geochimico. In particolare è stata studiata la frazione PM2.5, in termini di “aerosol medio”, cercando di identificarne i possibili processi di origine. Si sono inoltre valutate le relazioni tra i livelli di particolato dell’area di studio e le condizioni meteorologiche. Sono stati raccolti 169 campioni di PM2.5 e PM10 in cinque diverse stazioni (Parco Bissuola, Ca’ Moranzani, Malcontenta, Zelarino e Giudecca) e in tre periodi: 2-12 dicembre 2005, 14-28 maggio 2006, 14 novembre-5 dicembre 2006. I campioni di PM2.5 sono stati poi analizzati tramite ICP-MS. Le concentrazioni rilevate delle polveri e degli elementi chimici inorganici sono stati elaborati al fine di: (i) valutare le concentrazioni di PM2.5 e PM10 in termini di distribuzione areale e di andamento temporale; (ii) valutare le relazioni tra le concentrazioni di particolato e le condizioni meteorologiche; (iii) caratterizzare l’”aerosol medio”; (iv) individuare i principali processi di origine del particolato
Interannual heavy element and nutrient concentration trends in the top sediments of Venice Lagoon (Italy).
No full textThe elemental composition of surficial sediments of Venice Lagoon (Italy) in 1987, 1993, 1998 and 2003 were investigated. Zn and Cr concentrations resulted in higher than background levels, but only Cd and Hg were higher than legal quality standards (Italian Decree 2010/260 and Water Framework Directive 2000/60/EC). Contaminants with similar spatial distribution are sorted into three groups by means of correlation analysis: (i) As, Co, Cd, Cu, Fe, Pb, Zn; (ii) Ni, Cr; (iii) Hg. Interannual concentrations are compared by applying a factor analysis to the matrix of differences between subsequent samplings. A general decrease of heavy metal levels is observed from 1987 to 1993, whereas particularly high concentrations of Ni and Cr are recorded in 1998 as a consequence of intense clam fishing, subsequently mitigated by better prevention of illegal harvesting. Due to the major role played by anthropogenic sediment resuspension, bathymetric variations are also considered
The changes of polluting elements, organic carbon and N-P-compounds in the surface sediments of the Lagoon of Venice (Italy) between 1980s and 2000s
No full textPM1 composition in an urban site in Venice (Italy): seasonal differences, relationship with meteorological condition and source identification
No full textPM2.5 dispersion in Venice area: a model validation
No full textA multidisciplinary project was developed with the aim of better understand PM2.5 primary sources and secondary aerosol formation and compositions. A model system was used to simulate four periods during different seasons in 2009 for which both organic and inorganic measured data were available. Input data were estimated and formatted as requested by models. Measured and predicted data were compared for the three stations and during different seasons in order to test model performance
Studio dei profili verticali di temperatura e velocità del vento nel territorio lagunare di Venezia
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