Table 2.
Uncertainty of the analytical process.
| Compound | RSD% Sampling | RSD% Analysis | RSD% Process | U% Process (k = 2) |
|---|---|---|---|---|
| Benzene | 7.2 | 10 | 12 | 25 |
| Heptane | 10 | 14 | 17 | 34 |
| Toluene | 7.1 | 12 | 14 | 28 |
| Ethylbenzene | 9.3 | 14 | 17 | 34 |
| p-Xylene, m-Xylene | 12 | 15 | 19 | 39 |
| o-Xylene | 12 | 15 | 20 | 40 |
| 4-Ethyltoluene | 14 | 14 | 20 | 40 |
| 1,3,5 Trimethylbenzene | 15 | 14 | 20 | 40 |
| 1,2,4-Trimethylbenzene | 17 | 12 | 21 | 41 |
The average concentrations (169 ppbV = 1.69 × 10−5% v/v) were about 6 times of that at the Orleans site (station n° 10). This site lies in a cultural and recreational area, there are scattered university buildings and a large green area. RSD = Relative Standard Deviation, U = Uncertain.