What are the Driving Factors Influencing the Size Distribution of Airborne Synthetic Clay Particles Emitted from a Jet Milling Process?
| Autor: | Farhad Salimi, Ehsan Majd Faghihi, Grant Edwards, Lidia Morawska, Darren J. Martin, Congrong He |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Driving factors
Jet (fluid) Range (particle radiation) Particle number Workplace air Environmental engineering Nanoparticle Soil science 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Pollution Scientific method Environmental Chemistry Environmental science 0210 nano-technology 0105 earth and related environmental sciences Exposure assessment |
| Zdroj: | Aerosol and Air Quality Research. 16:25-35 |
| ISSN: | 2071-1409 1680-8584 |
| DOI: | 10.4209/aaqr.2015.03.0170 |
| Popis: | In the field of workplace air quality, measuring and analyzing the size distribution of airborne particles to identify their sources and apportion their contribution has become widely accepted, however, the driving factors that influence this parameter, particularly for nanoparticles (< 100 nm), have not been thoroughly determined. Identification of driving factors, and in turn, general trends in size distribution of emitted particles would facilitate the prediction of nanoparticles’ emission behavior and significantly contribute to their exposure assessment. In this study, a comprehensive analysis of the particle number size distribution data, with a particular focus on the ultrafine size range of synthetic clay particles emitted from a jet milling machine was conducted using the multi-lognormal fitting method. The results showed relatively high contribution of nanoparticles to the emissions in many of the tested cases, and also, that both surface treatment and feed rate of the machine are significant factors influencing the size distribution of the emitted particles of this size. In particular, applying surface treatments and increasing the machine feed rate have the similar effect of reducing the size of the particles, however, no general trend was found in variations of size distribution across different surface treatments and feed rates. The findings of our study demonstrate that for this process and other activities, where no general trend is found in the size distribution of the emitted airborne particles due to dissimilar effects of the driving factors, each case must be treated separately in terms of workplace exposure assessment and regulations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|