Table 1.
SPME fiber selection
| a. relative extraction efficiency (normalized to the response from a 20 μg/mL menthol aqueous solution sampled with a 75 μm Carboxen/PDMS SPME fiber) | |||
|---|---|---|---|
|
| |||
| Fiber ID | Matrix | ||
|
| |||
| water (20 μg/mL) | synthetic urine (20 μg/mL) | urine (~7 μg/mL) | |
| 65 μm PDMS/DVB | 3.0 | 2.0 | 1.7 |
| 75 μm Carboxen/PDMS | 1 | 1 | 1 |
| 65 μm CW/DVB | 2.8 | 1.7 | 2.1 |
| b. Percent carryover in μg/mL. | |||
|---|---|---|---|
|
| |||
| Fiber ID | Matrix | ||
|
| |||
| water (20 μg/mL) | synthetic urine (20 μg/mL) | urine (~7 μg/mL) | |
| 65 μm PDMS/DVB | 0.02 | 0.03 | 0.02 |
| 75 μm Carboxen/PDMS | 0.18 | 0.25 | 0.14 |
| 65 μm CW/DVB | 0.005 | 0.004 | N/A |