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Volume 10, issue 5 | Copyright
Atmos. Meas. Tech., 10, 1823-1830, 2017
https://doi.org/10.5194/amt-10-1823-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 16 May 2017

Research article | 16 May 2017

Laser ablation ICP-MS of size-segregated atmospheric particles collected with a MOUDI cascade impactor: a proof of concept

Marin S. Robinson1, Irena Grgić2, Vid S. Šelih2, Martin Šala2, Marsha Bitsui1, and Johannes T. van Elteren2 Marin S. Robinson et al.
  • 1Department of Chemistry and Biochemistry, Northern Arizona University, P.O. Box 5698, Flagstaff, AZ 86011, USA
  • 2Department of Analytical Chemistry, National Institute of Chemistry, Slovenia, Hajdrihova 19, 1000 Ljubljana, Slovenia

Abstract. A widely used instrument for collecting size-segregated particles is the micro-orifice uniform deposit impactor (MOUDI). In this work, a 10-stage MOUDI (cut-point diameter of 10µm to 56nm) was used to collect samples in Ljubljana, Slovenia, and Martinska, Croatia. Filters, collected with and without rotation, were cut in half and analyzed for nine elements (As, Cu, Fe, Ni, Mn, Pb, Sb, V, Zn) using laser ablation ICP-MS. Elemental image maps (created with ImageJ) were converted to concentrations using NIST SRM 2783. Statistical analysis of the elemental maps indicated that for submicron particles (stages 6–10), ablating 10% of the filter (0.5cm2, 20min ablation time) was sufficient to give values in good agreement (±10%) to analysis of larger parts of the filter and with good precision (RSE<1%). Excellent sensitivity was also observed (e.g., 20±0.2pgm−3V). The novel use of LA-ICP-MS, together with image mapping, provided a fast and sensitive method for elemental analysis of size-segregated MOUDI filters, particularly for submicron particles.

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Knowing the size and elemental composition of airborne particles is necessary to understand their impact on human health. A widely used instrument for collecting size-segregated particles is the multi-orifice uniform deposit impactor (MOUDI). Laser ablation ICP-MS in imaging mode provided multi-elemental analysis of size-segregated particles with excellent sensitivity. The maps generated offered insights regarding the uniformity of the elemental distribution.
Knowing the size and elemental composition of airborne particles is necessary to understand...
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