Maria Catrambone1, Silvia Canepari2, Marina Cerasa1, Tiziana Sargolini1, Cinzia Perrino 1


C.N.R. Institute of Atmospheric Pollution Research, 00015 Rome, Italy
Department of Chemistry, Sapienza University of Rome, 00185 Rome, Italy



Received: April 9, 2019
Revised: July 15, 2019
Accepted: August 23, 2019
Download Citation: ||https://doi.org/10.4209/aaqr.2019.04.0195  

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Cite this article:
Catrambone, M., Canepari, S., Cerasa, M., Sargolini, T. and Perrino, C. (2019). Performance Evaluation of a Very-low-volume Sampler for Atmospheric Particulate Matter. Aerosol Air Qual. Res. 19: 2160-2172. https://doi.org/10.4209/aaqr.2019.04.0195


Highlights

  • We evaluated the performance of a small very-low-volume sampler for atmospheric PM.
  • PM is collected on filters and chemical analyses can be carried out.
  • Concentration maps and studies of long-term concentration variations can be performed.
  • The repeatability of the measurements was below 17% for all the considered components.
  • A satisfactory agreement with 2.3 m3 h–1 reference samplers was obtained.

ABSTRACT


A cheap and small device for sampling atmospheric particulate matter (PM) has been recently developed. It works at a very low flow rate (0.5 L min–1) and is able to collect the atmospheric aerosol on filters, allowing subsequent chemical analyses. The samplings have a long duration (1–2 months), and the devices can be used to make cheap networks over a territory. These very-low-volume samplers (VLVS) can be used to trace long-term concentration variations and to draw up concentration maps of PM and its chemical components.

The performance of the VLVS was evaluated in terms of measurement repeatability and of agreement with the results obtained when using a 2.3 m3 h–1 reference sampler (REF). The study period was 1 year. The considered PM components were ions, polycyclic aromatic hydrocarbons (PAHs), levoglucosan and elements.

The repeatability of the measurements was very good for all the examined PM components: the standard deviation of 3 replicates (co-located samplers) over 9 measurement periods was in the range 2.0–5.5% for ions, 10–17% for PAH, 5.2% for levoglucosan and 5.6–16% for elements. It was 8.2% for the PM mass concentration. This satisfactory performance indicates that the VLVSs can be reliably used to evaluate the spatial variability and to draw concentration maps of PM and PM components.

A very good agreement with the reference sampler was obtained for ions, with the only exception of ammonium nitrate and ammonium chloride (VLVS values were up to 10–20% lower than the reference values), levoglucosan and elements. In the case of PAH, instead, the ratio VLVS/REF was in the range 1.2–1.6 for 4-ring congeners and 0.4–0.8 for 5- and 6-ring congeners. For all the congeners, anyway, these typical ratios were kept, with small variations, during the whole study period.


Keywords: Validation; Sampling artifacts; Sampling duration; Spatial distribution; Concentration maps.

 



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