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 Elteren21Department of Chemistry and Biochemistry, Northern Arizona University, P.O. Box 5698, Flagstaff, AZ, U.S. 86011 2Department of Analytical Chemistry, National Institute of Chemistry, Slovenia, Hajdrihova 19, SI - 1000 Ljubljana, Slovenia
Received: 20 Dec 2016 – Accepted for review: 10 Feb 2017 – Discussion started: 13 Feb 2017
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 (cutpoint dia. 10 µm to 56 nm) was used to collect samples in Ljubljana, Slovenia and Martinska, Croatia. Filters, collected with and without rotation, were cut in half and analysed 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 (0.5 cm2, 20 min 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 ± 0.2 pg m−3 V). 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.
Robinson, M. S., Grgić, I., Šelih, V. S., Šala, M., Bitsui, M., and van Elteren, J. T.: Laser Ablation ICP-MS of Size-Segregated Atmospheric Particles Collected with a MOUDI Cascade Impactor: A Proof of Concept, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-411, in review, 2017.