On the importance of particle density in ELPI data post-treatment

The aim of this study is to compare number and mass concentrations obtained by different reference devices (SMPS, TEOM) with ELPI data. Specific attention will be paid to the importance of particle density in ELPI data post-treatment. Tested aerosols are Zn/Al agglomerates generated by thermal metal spraying. Number and mass concentrations obtained with a SMPS and a TEOM, respectively, were compared to calculated concentrations obtained with an ELPI. The data post-treatment was performed assuming different particle densities. Results highlight a good agreement between SMPS and ELPI number and mass concentrations when effective density and average effective density are considered. On the contrary, considering raw material density induces an overestimation of the number concentration by a factor close to 30.