The Effect of Isotopic Composition on the Uncertainty of Routine Metal Mass Concentration Measurements in Ambient Air
Figure 1
Relative contributions to the
standard uncertainty of the determination of metal mass concentration in
ambient air, as part of the UK Heavy Metals Monitoring Network. This example
shows a measurement with an overall expanded uncertainty at the 95% confidence
interval of approximately 20%. The changing uncertainty contribution from the
variation in the sample isotopic composition for the different metals measured
by the “network” is indicated by the additional lines and labelling on the
bottom bar.