Table 3.
Total airborne manganese mass concentrations by work area using 37-mm cassette samplers placed in breathing zones of workers, and excess rate of Korean MoEL's OES for manganese
| Work area | n | GM (μg/m3) | GSD | Range (μg/m3) | Excess rate (%) |
|---|---|---|---|---|---|
| Steel cutting | 10 | 60.5 | 4.0 | 52.0–407.4 | 0.0 |
| Block assembly | 32 | 198.4 | 5.7 | 58.2–2,335.1 | 18.8 |
| Block erection | 21 | 98.1 | 6.4 | 4.3–2,596.6 | 14.3 |
| Outfitting preparation | 7 | 25.0 | 3.4 | 2.4–109.9 | 0.0 |
| Outfitting installation | 16 | 99.4 | 4.9 | 8.0–1,345.2 | 6.3 |
| Total | 86 | 108.1 | 5.7 | 2.4–2,596.6 | 11.6 |
GM, geometric mean; GSD, geometric standard deviation; MoEL, Ministry of Employment and Labor; n, number of samples; OES, occupational exposure standard for manganese of MoEL in Republic of Korea = 1,000.0 μg/m3.