| Parameter | Proficiency testing item C-CB11A |
Uncertainty | Proficiency testing item C-CB11B |
Uncertainty | Unit |
| Trichloroethene | 0.74 | 0.05 | 1.36 | 0.07 | µg/L |
| Tetrachloroethene | 1.81 | 0.10 | <0.1 | - | µg/L |
| 1,1,1-Trichloroethane | 1.22 | 0.06 | <0.1 | - | µg/L |
| Trichloromethane | 1.23 | 0.09 | 2.93 | 0.16 | µg/L |
| Tetrachloromethane | 1.35 | 0.07 | 0.248 | 0.019 | µg/L |
| 1,1-Dichloroethene | 1.01 | 0.06 | 1.45 | 0.08 | µg/L |
| Tribromomethane | 1.76 | 0.09 | 0.459 | 0.029 | µg/L |
| Bromodichloromethane | 2.21 | 0.11 | 0.357 | 0.029 | µg/L |
| Dibromochloromethane | 1.90 | 0.10 | 0.74 | 0.04 | µg/L |
| Dichloromethane | 5.7 | 0.3 | 0.77 | 0.11 | µg/L |
| 1,2-Dichloroethane | 1.30 | 0.08 | 4.10 | 0.21 | µg/L |
| cis-1,2-Dichloroethene | 1.28 | 0.08 | 0.92 | 0.07 | µg/L |
| trans-1,2-Dichloroethene | 1.91 | 0.12 | <0.1 | - | µg/L |