Sample (Toothpaste) | Concentration of Fluoride (mg/L) by direct Measurement | Concentration of Fluoride (mg/L) by standard addition method |
T1 | 0.75 | 0.73 |
T2 | 0.65 | 0.64 |
T3 | 0.35 | 0.32 |
T4 | 0.16 | 0.15 |
T5 | 0.14 | 0.13 |
T6 | 0.05 | 0.05 |
T7 | 0.02 | 0.03 |