Research Article
Trace Analysis in End-Exhaled Air Using Direct Solvent Extraction in Gas Sampling Tubes: Tetrachloroethene in Workers as an Example
Table 1
Example pipetting scheme for the preparation of the calibration samples; concentration range 2 to 20 μg tetrachloroethene/L exhaled air.
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Number | Calibration solutions | Calibration samples | Conc. stock solution II (mg/L) | stock solution II (μL) | final (mL) | Conc. (µg/L) | calibration solution (µL) | gas sampling tube (mL) | Mass (µg) | Conc. (µg/L) |
| 1 | 93.9 | 40 | 10 | 376 | 200 | 37.433 | 0.0751 | 2.0 | 2 | 93.9 | 80 | 10 | 751 | 200 | 37.668 | 0.1502 | 4.0 | 3 | 93.9 | 120 | 10 | 1127 | 200 | 37.639 | 0.2254 | 6.0 | 4 | 93.9 | 160 | 10 | 1502 | 200 | 37.524 | 0.3005 | 8.0 | 5 | 93.9 | 200 | 10 | 1878 | 200 | 37.573 | 0.3756 | 10.0 | 6 | 93.9 | 240 | 10 | 2254 | 200 | 37.486 | 0.4507 | 12.0 | 7 | 93.9 | 280 | 10 | 2629 | 200 | 37.544 | 0.5258 | 14.0 | 8 | 93.9 | 320 | 10 | 3005 | 200 | 37.593 | 0.6010 | 16.0 | 9 | 93.9 | 360 | 10 | 3380 | 200 | 37.598 | 0.6761 | 18.0 | 10 | 93.9 | 400 | 10 | 3756 | 200 | 37.661 | 0.7512 | 19.9 |
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