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Table 8 Uncertainty in sampling of SPM by HVS

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

Uncertainty components Distribution Calibration uncertainty reported in certificate Standard uncertainty u(x)
Uncertainty in flow rate of HVS at 95% confidence level Normal; k = 2
(Type 'B')
1.0 ± 0.2 (m3/minute) 0.2/2 = 0.1
Uncertainty due to time (in minutes) recording by time tracker recorder at 95% confidence level Normal; k = 2
(Type 'B')
1.0 ± 0.05 (minute) 0.05/2 = 0.025
Uncertainty in ambient pressure measurement at 95% confidence level Normal; k = 2
(Type 'B')
994.2 ± 0.6 (mbar) 0.6/2 = 0.3
Uncertainty in measuring *temperature of the site at 95% confidence level Normal; k = 2
(Type 'B')
30 ± 3 (°C) 3/2 = 1.5
  1. Combined uncertainty due to