Asbestos fibre concentrations at a nephrite processing factory analysed by PCM and TEM
| Location | Procedure | Sample time (min) | Air volume (L) | Concentration (f/cm3) | Asbestos type | ||
|---|---|---|---|---|---|---|---|
| PCM | TEM | TEM | |||||
| Length ≥0.5 µm | Length ≥5 µm | ||||||
| Worker | Cutting | 20 | 60.084 | 0.44 | 12.1 | 1.0 | Tremolite, actinolite |
| Rough grinding | 20 | 60.084 | 4.70 | 24 | 2.9 | Tremolite, actinolite | |
| Fine grinding | 20 | 60.084 | 0.18 | 0.098 | 0.05 | Tremolite | |
| Polishing | 16.1 | 48.368 | <0.059 | <0.062 | <0.062 | None detected | |
| Environment | Ambient air | 76 | 225.963 | 0.11 | 2.1 | 0.34 | Tremolite |
The samples are grouped by location and procedure.
PCM, phase contrast microscopy; TEM, transmission electron microscopy.