15-5
Agilent 7500 ICP-MS ChemStation Operator’s Manual
Performing an Isotope Dilution Analysis
NOTE ICP-MS does not have the exact same sensitivity for all masses. Variations in mass
response (mass bias) occur in the interface, ion lenses, analyzer and detection
systems. Mass bias is more severe at low mass, where the percentage mass difference
between adjacent masses is higher. In general, however, mass bias is relatively
constant and easily corrected for by calculating the mass bias factor obtained from a
certified isotopic standard.
4 Click the Browse push button.
The Select Data File dialog box appears.
Select Data File Dialog Box
5 Select the standard data file to be used for calculating the mass bias factor, using
one of the following methods:
• Click a file name in the displayed list and click OK.
• Double-click a file name in the displayed list.
• Type the file name and click OK.
The dialog box will disappear and the selected standard data file will be indicated
next to the Browse push button.
When data is acquired in the Multi Tune mode, select the tune step in Tune Step to
use for the data analysis. When the Multi Tune mode is not used, select “1” for the
tune step.
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