The knowledge of size-segregated elemental concentrations in atmospheric particulate matter (PM) gives a useful contribution to the complete chemical characterisation; this information can be obtained by sampling with multi-stage cascade impactors. In this work, samples were collected using a low-pressure 12-stage Small Deposit Impactor and a 13-stage rotating Micro Orifice Uniform Deposit Impactor™. Both impactors collect the aerosol in an inhomogeneous geometry, which needs a special set-up for X-ray analysis. This work aims at setting up an energy dispersive X-ray fluorescence (ED-XRF) spectrometer to analyse quantitatively size-segregated samples obtained by these impactors. The analysis of cascade impactor samples by ED-XRF is not customary; therefore, as additional consistency test some samples were analysed also by particle-induced X-ray emission (PIXE), which is more frequently applied to size-segregated samples characterised by small PM quantities. A very good agreement between ED-XRF and PIXE results was obtained for all the detected elements in samples collected with both impactors. The good inter-comparability proves that our methodology is reliable for analysing size-segregated samples by ED-XRF technique. The advantage of this approach is that ED-XRF is cheaper, easier to use, and more widespread than PIXE, thus promoting an intensive use of multi-stage impactors.
ED-XRF set-up for size-segregated aerosol samples analysis / V. Bernardoni; E. Cuccia; G. Calzolai; M. Chiari; F. Lucarelli; D. Massabo; S. Nava; P. Prati; G. Valli; R. Vecchi. - In: X-RAY SPECTROMETRY. - ISSN 0049-8246. - STAMPA. - 40:(2011), pp. 79-87. [10.1002/xrs.1299]
ED-XRF set-up for size-segregated aerosol samples analysis
CALZOLAI, GIULIA;CHIARI, MASSIMO;LUCARELLI, FRANCO;NAVA, SILVIA;
2011
Abstract
The knowledge of size-segregated elemental concentrations in atmospheric particulate matter (PM) gives a useful contribution to the complete chemical characterisation; this information can be obtained by sampling with multi-stage cascade impactors. In this work, samples were collected using a low-pressure 12-stage Small Deposit Impactor and a 13-stage rotating Micro Orifice Uniform Deposit Impactor™. Both impactors collect the aerosol in an inhomogeneous geometry, which needs a special set-up for X-ray analysis. This work aims at setting up an energy dispersive X-ray fluorescence (ED-XRF) spectrometer to analyse quantitatively size-segregated samples obtained by these impactors. The analysis of cascade impactor samples by ED-XRF is not customary; therefore, as additional consistency test some samples were analysed also by particle-induced X-ray emission (PIXE), which is more frequently applied to size-segregated samples characterised by small PM quantities. A very good agreement between ED-XRF and PIXE results was obtained for all the detected elements in samples collected with both impactors. The good inter-comparability proves that our methodology is reliable for analysing size-segregated samples by ED-XRF technique. The advantage of this approach is that ED-XRF is cheaper, easier to use, and more widespread than PIXE, thus promoting an intensive use of multi-stage impactors.File | Dimensione | Formato | |
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