| Sample | Arsenic/µgL−1 | Recovery ± s (%) | srb (%) | |
| Added | Founda | |||
| Tap water (Chattogram city) | 0 10 50 | 27.5 38.0 527.5 |
101.3 ± 0.5 100 ± 0.0 |
0.25 0.00 |
| Rain water (Chattogram city) | 0 10 50 | 7.5 17.5 520.0 |
100 ± 0.0 102.5 ± 1.0 |
0.00 0.33 |