Exposure assessment of nano-sized and respirable particles at different workplaces

Chuen Jinn Tsai, Cheng Yu Huang, Sheng Chieh Chen, Chi En Ho, Cheng Hsiung Huang, Chun Wan Chen, Cheng Ping Chang, Su Jung Tsai, Michael J. Ellenbecker

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

In this study, nanoparticle (NP, diameter < 100 nm) and respirable particles measurements were conducted at three different nanopowder workplaces, including the mixing area of a nano-SiO2- epoxy molding compound plant (primary diameter: 15 nm), bagging areas of a nano-carbon black (nano- CB) (primary diameter: 32 nm) and a nano-CaCO3 (primary diameter: 94 nm) manufacturing plant. Chemical analysis of respirable particle mass (RPM) and NPs was performed to quantify the content of manufactured nanoparticles in the collected samples. Nanopowder products obtained from the plants were used in the laboratory dustiness testing using a rotating drum tester to obtain particle mass and number distributions. The obtained laboratory data were then used to elucidate the field data. Both field and laboratory data showed that NP number and mass concentrations of manufactured materials were close to the background level. Number concentration was elevated only for particles with the electrical mobility diameter > 100 nm during bagging or feeding processes, unless there were combustionrelated incidental sources existed. Large fraction of nanomaterials was found in the RPM due to agglomeration of nanomaterials or attachment of nanomaterials to the larger particles. From this study, it is concluded that RPM concentration measurements are necessary for the exposure assessment of nanoparticles in workplaces.

Original languageEnglish (US)
Pages (from-to)4161-4172
Number of pages12
JournalJournal of Nanoparticle Research
Volume13
Issue number9
DOIs
StatePublished - Sep 2011

Bibliographical note

Funding Information:
Acknowledgments The financial support from the Taiwan Institute of Occupational Health and Safety (contract number IOSH98-H324) and Taiwan Environmental Protection Agency (contract number EPA 99-U1U1-02-103) is gratefully acknowledged.

Keywords

  • Dustiness testing
  • Exposure assessment
  • Nanoparticle
  • Occupational environment
  • Respirable particle

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