Novel active personal nanoparticle sampler for the exposure assessment of nanoparticles in workplaces

Chuen-Tinn Tsai*, Chun Nan Liu, Shao Ming Hung, Sheng Chieh Chen, Shi Nian Uang, Yung Sung Cheng, Yue Zhou

*Corresponding author for this work

Research output: Contribution to journalArticle

73 Scopus citations

Abstract

A novel active personal nanoparticle sampler (PENS), which enables the collection of both respirable particulate mass (RPM) and nanoparticles (NPs) simultaneously, was developed to meet the critical demand for personal sampling of engineered nanomaterials (ENMs) in workplaces. The PENS consists of a respirable cyclone and a micro-orifice impactor with the cutoff aerodynamic diameter (d pa50) of 4 μm and 100 nm, respectively. The micro-orifice impactor has a fixed micro-orifice plate (137 nozzles of 55 μm in the inner diameter) and a rotating, silicone oil-coated Teflon filter substrate at 1 rpm to achieve a uniform particle deposition and avoid solid particle bounce. A final filter is used after the impactor to collect the NPs. Calibration results show that the d pa50 of the respirable cyclone and the micro-orifice impactor are 3.92 ± 0.22 μm and 101.4 ± 0.1 nm, respectively. The d pa50 at the loaded micro-Al 2O 3 mass of 0.36-3.18 mg is shifted to 102.9-101.2 nm, respectively, while it is shifted to 98.9-97.8 nm at the loaded nano-TiO 2 mass of 0.92-1.78 mg, respectively. That is, the shift of d pa50 due to solid particle loading is small if the PENS is not overloaded.Both NPs and RPM concentrations were found to agree well with those of the IOSH respirable cyclone and MOUDI. By using the present PENS, the collected samples can be further analyzed for chemical species concentrations besides gravimetric analysis to determine the actual exposure concentrations of ENMs in both RPM and NPs fractions in workplaces, which are often influenced by the background or incident pollution sources.

Original languageEnglish
Pages (from-to)4546-4552
Number of pages7
JournalEnvironmental Science and Technology
Volume46
Issue number8
DOIs
StatePublished - 17 Apr 2012

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