Evaluation of grinding aerosols in terms of alveolar dose

The significance of using mass, surface area and number metrics

Andrew Maynard, A. T. Zimmer

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Aerosols generated by mechanical means are generally assumed to have low particle number and surface area concentrations compared with mass concentration. As a result, they have received little attention in the current debate over the use of number- and surface area-based metrics for low-solubility particles. However, it is plausible that some high-energy mechanical processes found in workplaces may lead to the generation of fine aerosols that are characterized by high number and surface area concentrations. A preliminary investigation has been carried out into the aerosol generated during high-speed grinding to investigate the generation of fine particles from mechanical processes. Aerosol size distribution measurements between 5 nm and 20 - 1/4m were made during grinding on steel, aluminum, polytetrafluoroethylene, granite, ceramic tile and hardwood. Distributions were weighted by alveolar deposition probability to provide an indication of potential dose against metrics of number, surface area and volume. In all cases, the number-weighted size distributions showed most particles to lie in the ultrafine particle range (diameter 1 - 1/4m, although aluminum, hardwood and steel all show substantial volume-fractions in the ultrafine region. There was evidence that the grinding tool contributed to the measured ultrafine aerosol fraction. Further work is required to isolate particle sources during similar operations.

Original languageEnglish (US)
Pages (from-to)315-319
Number of pages5
JournalAnnals of Occupational Hygiene
Volume46
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

Aerosols
Mechanical Phenomena
Steel
Aluminum
Polytetrafluoroethylene
Ceramics
Workplace
Solubility
Ultrafine

Keywords

  • exposure metrics
  • grinding
  • ultrafine aerosol

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

Cite this

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