Agilent Technologies 7500 ICP-MS Operator's Manual page 92

Agilent 7500 ICP-MS ChemStation Operator's Manual
Tuning
3 Select Tune >> Acq. Params.
The Acquisition Parameters - Doubly Charged Ion dialog box will appear.
Acquisition Parameters - Doubly Charged Ion Dialog Box
4 Select the check boxes of the channels to be displayed in the ICP-MS Tuning -
Doubly Charged Ion window.
5 When using a tuning solution different from the standard tuning solution,
change the mass value in the Mass or Ratio text box.
Enter the mass (m/z) of the element used for tuning and the mass (m/2) of its oxide.
If Ce is not present in the tuning solution, use Ba. Ba also readily generates doubly
charged ions and is often used in tuning in which suppression of doubly charged ion
generation is desired.
When using Ce, set the mass values to 70 amu and 140 amu so that the strength ratio
becomes 70/140 amu.
When using Ba, set the mass values to 69 amu and 138 amu so that the strength ratio
becomes 69/138 amu.
6 Enter the data collection time (integration time) for each mass in the Integration
Time: text box.
Generally, set 0.1 seconds per one mass value.
7 Select the Plot check boxes of the channels to be displayed on the graph in the
ICP-MS Tuning - Doubly Charged Ion window.
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