15-8
Agilent 7500 ICP-MS ChemStation Operator’s Manual
Performing an Isotope Dilution Analysis
The Edit Element dialog box displays the masses and isotope abundances of the
element selected in the Select Element dialog box. To output the results of the
Isotope Dilution analysis, enter the following items.
• Check Box
Select two isotopes.
• Spike
Enter the certified isotope ratio of the added spike sample in each cell of the
mass column. The atomic weight of the spike is automatically calculated and
displayed at the bottom. Ensure that the total of the spike isotope abundance val-
ues adds up to exactly 100.
• Sample Weight
Enter the mass or volume of the sample.
• Units
Select the sample concentration units (mass or volume).
• Spike Weight
Enter the exact mass of the spike.
• Units
Select the spike concentration units.
• Standard
The isotopic abundance of the standard should be edited to display the certified
abundances of the isotopes contained in the standard used for mass bias correc-
tion.
7 To accept all the settings, click OK.
The ID Parameters dialog box disappears and ChemStation returns to the
ICP-MS Data Analysis window.
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