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

Table 4 Uncertainty due to dilution from 1.0mg/litre (1000 μg/L) to working range in 50 ml volumetric flask

Uncertainty components	Distribution	Calibration uncertainty reported in certificate	Standard uncertainty
Calibration accuracy as per certificate; k = 2	Normal	± 0.02 mL	0.02//2 = 0.01
Effect of temperature Variation on 50 mL volumetric flask	Rectangular	50 × *3 × 2.1 × 10^-4 = 0.032	0.032/√3 = 0.018

In principal the uncertainty in measurement in the solution will be different from the uncertainty associated with the first dilution. However for simplicity we have considered the uncertainty of first dilution even after performing the dilution two times.

ISSN: 2661-801X