Table 3.
Quality control for water quality parameters, Tanzania
| Characteristic | Total samples collected | No. (%) of duplicated samples | Relative percent difference |
|---|---|---|---|
| Free chlorine | 150 | 16 (10.7) | 4.70 |
| Total chlorine | 150 | 14 (9.3) | 2.93 |
| Turbidity* | 45 | 11 (24.4) | 5.90 |
| pH* | 44 | 8 (18.2) | 0.39 |
| Conductivity* | 42 | 7 (16.7) | 0.73 |
| Trihalomethanes | 152 | 36 (23.7) | |
| Chloroform | 152 | 23 (15.1)† | 1.95 |
| Bromodichloromethane | 152 | 35 (23.0) | 1.55 |
| Dibromochloromethane | 152 | 32 (21.5) | 2.50 |
| Bromoform | 152 | 19 (12.5) | 1.45 |
*
Not all 48 possible tested because of laboratory timing.
†
Number of duplicates varies between trihalomethane analytes because of dropping duplicate samples collected when one or both samples were below the detection limit.