Table 10.
Air sampling for 90 mm at 23.6 °C and 24.6% relative humidity (TWAa)
| Method | Volume of air sampled (L) |
Quantity of OPA found (µg) |
Concentration of OPA in air (µg m3) |
Average concentration (µg m3) |
|---|---|---|---|---|
| DNPH-HPLC | 90.7 | 22.2 | 245 | 246 |
| DNPH-HPLC | 90.2 | 22.4 | 248 | |
| Impinger-Fob | 91.7 | 21.5 | 234 | 225 |
| Impinger-Fob | 93.7 | 20.1 | 215 |
a
“TWA” means “time weighted average”.
b
Water (110 mg and 100 mg) was found in the first and second impingers, respectively. “Fo” is an accepted abbreviation for “fluorescence”.