14-7
Agilent 7500 ICP-MS ChemStation Operator’s Manual
Performing an Isotope Ratio Analysis
8 Fill in the IR Output Format panel.
To do so, complete the following steps:
a) Click on a cell under the Numerator.
The cell will be high-lighted and a Numerator text box with a drop down list and
an Enter button appears. The drop down list contains all isotope masses of the
selected element.
b) Select a mass to be the numerator of the isotope ratio, then click Enter.
The selected cell remains high-lighted with the selected mass number.
c) Click on a cell under the Denominator.
The cell will be high-lighted and a Denominator text box with a drop down list
and an Enter button appears. The drop down list contains all isotope masses of
the selected element and Total, which is the sum of all isotopes of that element.
d) Select a mass to be the denominator of the isotope ratio, then click Enter.
The selected cell remains high-lighted with the selected mass number.
NOTE You can select up to 10 isotope ratios. Repeat the above steps, or press and hold the
Control key to select multiple cells and input the same selection.
9 To accept all the settings, click OK.
The IR Parameters dialog box disappears and ChemStation returns to the ICP-MS
Data Analysis window.
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