Table 5 Uncertainty due to five mL pipette used for dilution up to 50 mL
| Uncertainty component | Distribution | Standard Uncertainty ± μ(x) | |
|---|---|---|---|
| Calibration accuracy as per certificate; k = 2 | ±0.02 mL | Normal | 0.02/2 = 0.01 |
| Effect of temperature variation on 5 ml pipette |
5 × *3 × 2.1 × 10-4 = 0.0032 | Rectangular | 0.0032/√3 = 0.0018 |
- For every dilution the uncertainty will change, this change is very negligible; therefore for simplicity we have considered the uncertainty of first dilution even after performing the dilution second times.
- So combined uncertainty due to [C As ] by substituting values from Table 2, 3, 4 and 5
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- Similarly combined uncertainty for sample S-3 to S-7 has been calculated and the final values are given in table 3
