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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