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Table 5 Uncertainty due to five mL pipette used for dilution up to 50 mL

From: Quantifying uncertainty in the measurement of arsenic in suspended particulate matter by Atomic Absorption Spectrometry with hydride generator

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
  1. 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.
  2. So combined uncertainty due to [C As ] by substituting values from Table 2, 3, 4 and 5
  3. Similarly combined uncertainty for sample S-3 to S-7 has been calculated and the final values are given in table 3