A streak sampler has been designed to allow continuous collection of air particulates on Nuclepore PC 0.4 μm filters for a period of one week. A time resolution of one hour is achieved. For reliable quantitative determinations of concentrations, the flow rate may be stabilized with a very simple feedback mechanism acting on the pump. The preset value is typically 20 l/h and is maintained constant to better than 5% even under extreme conditions of filter loading. PIXE measurements were performed with the 3 MeV external proton beam at the Van de Graaff accelerator of the University of Florence. With currents of 4 nA and measurement times of 3 to 5 min, the counting rate was sufficiently high that statistically significant results for Na, Al, Si, S, Cl, Ca, Fe, Cu, Zn, Br and Pb were obtained to show hourly variations. Average values for S, Pb and Br during a one-week sampling period in September 1988 were 4.3, 1.2 and 0.3 μg/m3, respectively. Comparable values in January 1989 were 12.7, 2.2 and 0.45 μg/m3 for S, Pb and Br.

PIXE measurements of air particulate elemental composition in the urban area of Florence, Italy / P. Del Carmine; F. Lucarelli; P.A. Mando'; G. Moscheni; A. Pecchioli; J.D. MacArthur. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION B, BEAM INTERACTIONS WITH MATERIALS AND ATOMS. - ISSN 0168-583X. - STAMPA. - vol.45:(1990), pp. 341-346. [10.1016/0168-583X(90)90848-O]

PIXE measurements of air particulate elemental composition in the urban area of Florence, Italy

LUCARELLI, FRANCO;MANDO', PIER ANDREA;
1990

Abstract

A streak sampler has been designed to allow continuous collection of air particulates on Nuclepore PC 0.4 μm filters for a period of one week. A time resolution of one hour is achieved. For reliable quantitative determinations of concentrations, the flow rate may be stabilized with a very simple feedback mechanism acting on the pump. The preset value is typically 20 l/h and is maintained constant to better than 5% even under extreme conditions of filter loading. PIXE measurements were performed with the 3 MeV external proton beam at the Van de Graaff accelerator of the University of Florence. With currents of 4 nA and measurement times of 3 to 5 min, the counting rate was sufficiently high that statistically significant results for Na, Al, Si, S, Cl, Ca, Fe, Cu, Zn, Br and Pb were obtained to show hourly variations. Average values for S, Pb and Br during a one-week sampling period in September 1988 were 4.3, 1.2 and 0.3 μg/m3, respectively. Comparable values in January 1989 were 12.7, 2.2 and 0.45 μg/m3 for S, Pb and Br.
1990
vol.45
341
346
P. Del Carmine; F. Lucarelli; P.A. Mando'; G. Moscheni; A. Pecchioli; J.D. MacArthur
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/482273
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 39
  • ???jsp.display-item.citation.isi??? 39
social impact