I started using the multistage impactor MOUDI and I wonder about the best ideas for the interpretation of the results considering wall losses. Any suggestion or shared protocol is welcome.
Hello Emanuele,
First of all it would be important to know what model (type) MOUDI you are using. The manufactuer states that MOUDI-II and NanoMOUDI-II impactors have the same aerodynamic nozzle designs as the original MOUDI impactors but lower inter-stage wall losses. Secondly I would expect that bounce effects are a much bigger issue and for that reason it would be important to know your exact application and if any coating of the substrates would be possible and helpful.
As regards an estimation of the effects and an interpretation of the results, have a look at this paper: Chen, Sheng-Chieh, Tsai, Chuen-Jinn, et al. (2011). The Influence of Relative Humidity on Nanoparticle Concentration and Particle Mass Distribution Measurements by the MOUDI. Aerosol Science and Technology, 45: 5, 596-603, DOI: 10.1080/02786826.2010.551557.
Regards,
/Oliver
Oliver,
Thanks for the comment and the reference - we will look at it. We are using the M100/110R Rotating MOUDI Impactor - it is the old rotating MOUDI impactor. The study we are conducting focuses on the analysis of mine dust and investigation of the percent of quartz for each size fraction. We are using coated substrates
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