Preprints
https://doi.org/10.5194/amt-2021-70
https://doi.org/10.5194/amt-2021-70

  12 May 2021

12 May 2021

Review status: this preprint is currently under review for the journal AMT.

Compositional data analysis (CoDA) as a tool to evaluate a new low-cost settling-based PM10 sampling head in a desert dust source region

Yangjunjie Xu-Yang1, Rémi Losno1, Fabrice Monna2, Jean-Louis Rajot3,4, Mohamed Labiadh5, Gilles Bergametti3, and Béatrice Marticorena3 Yangjunjie Xu-Yang et al.
  • 1Université de Paris, Institut de Physique du Globe de Paris, UMR CNRS 7154, Paris, France
  • 2ARTEHIS, UMR CNRS 6298, Université Bourgogne-Franche Comté, Dijon, France
  • 3LISA, Université Paris Est Créteil, Université de Paris, UMR CNRS 7583, France
  • 4IRD, Institut pour la Recherche et le développement
  • 5Institut des Régions Arides, Medenine, Tunisia

Abstract. This paper presents a new sampling head design and the method used to evaluate it. The elemental composition of aerosols collected by two different sampling devices in a semi-arid region of Tunisia is compared by means of compositional perturbation vectors and biplots. This set of underused mathematical tools belongs to a family of statistics created specifically to deal with compositional data. The two sampling devices operate at a flow rate of about 17 L min−1, with a cut-off diameter of 10 µm. The first device is a low-cost laboratory-made system, where the largest particles are removed by gravitational settling in a vertical tube. This new system will be compared to the second device, a brand-new standard commercial PM10 sampling head, where size segregation is achieved by particle impaction on a metal surface. A total of 44 elements (including rare earth elements or REE, together with Al, As, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, P, Pb, Rb, S, Sc, Se, Sr, Ti, Tl, U, V, Zn, and Zr), was analysed in sixteen paired samples, collected during a two-week field campaign in Tunisian dry lands, close to source areas, with high levels of large particles. The contrasting meteorological conditions encountered during the field campaign allowed a broad range of aerosol compositions to be collected, with very different aerosol mass concentrations. No compositional differences were observed between samples collected simultaneously by the two devices. The mass concentration of the particles collected was estimated through chemical analysis, and results for the two sampling devices were also very similar to those obtained from an on-line aerosol weighing system, TEOM (tapered element oscillating micro-balance), installed next to them. Results suggest that the commercial PM10 impactor head can therefore be replaced by the decanter, without any measurable bias, for the determination of chemical composition, and for further assessment of PM10 concentrations in source regions.

Yangjunjie Xu-Yang et al.

Status: open (until 07 Jul 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-70', Anonymous Referee #1, 06 Jun 2021 reply
  • RC2: 'Comment on amt-2021-70', Anonymous Referee #2, 09 Jun 2021 reply

Yangjunjie Xu-Yang et al.

Yangjunjie Xu-Yang et al.

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Short summary
Suspended particles in air (aerosols) are sampled with a pump drawing ambient air through a filter. The air inlet must be carefully designed to control the size of sampled particles and to reject the largest ones (> 10 µm). A low-cost sampling head for determination of the finest fraction of aerosol (< 10 µm in diameter) is presented. Compositional Data Analysis (CoDA) tools are extensively used here to demonstrate similarity between the low-cost sampling head and other existing systems.