The Effect of Isotopic Composition on the Uncertainty of Routine Metal Mass Concentration Measurements in Ambient Air
Figure 3
(a) V, Cr, Fe, Ni, Cu, and Zn: comparison of
the measured relative isotopic abundance of the calibration standards (black
circles, with the grey bars representing the standard error of the mean)
against the expected range in natural, or representative, isotopic compositions
(whichever is the larger range) (black bars). The relative atomic mass number is
displayed for each isotope, with the boxed number being the isotope used for
the quantification of the samples. Values are normalised to the centre of the
natural (or representative) composition range for each isotope. The relative
abundance is displayed for each element in the separate plot beneath the main
chart. (b) Cd, Pt, Hg, and Pb: comparison
of the measured relative isotopic abundance of the calibration standards (black
circles, with the grey bars representing the standard error of the mean)
against the expected range in natural, or representative, isotopic compositions
(whichever is the larger range) (black bars). The relative atomic mass number
is displayed for each isotope, with the boxed number being the isotope used for
the quantification of the samples. Values are normalised to the centre of the
natural (or representative) composition range for each isotope. The relative
abundance is displayed for each element in the separate plot beneath the main
chart.
