Agilent Technologies 7500 ICP-MS Operator's Manual page 128

Agilent 7500 ICP-MS ChemStation Operator's Manual
Tuning
7) Display the signals by clicking the Check Count button and confirm that the
signal is stable. At this time, the flow rate of the H
the Stop button after confirming signal stability.
8) Click the Ramp Flow button. Sensitivity data is collected by changing the H
gas within the flow rate range that was previously set. The message will be
displayed on the message line after the data collection is complete.
9) When the previous step has finished, aspirate fresh DI water or nitric acid
solution (blank solution) whose concentration is the same as the tuning
solution.
10)Select Blank (blank solution) in Current Solution.
11) Display the signal by clicking the Check Count button and confirm that the
signal is at a normal background level replacing the solution. If it's not low
enough, wait until it falls. At this time, the flow rate of the H
change. Click the Stop button once confirming an acceptable background
level.
12)Click the Ramp Flow button. The background data is collected by adjusting
the H gas within the flow rate range that was previously set. A message will
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be displayed on the message line after the data collection is complete.
13)After collecting data from both the tuning and blank solutions, click the Graph
button to view the result.
14)The Reaction Gas Graph Dialog Box will appear. In the dialog box, the
sensitivity and the BEC (Background Equivalent Concentration) of the tuning
and blank solution, for the different flow rates of H
measured. Examine this graph and determine the best sensitivity and flow rate
of the H gas while satisfying the BEC.
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4-52
gas doesn't change. Click
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gas doesn't
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gas, are plotted each mass
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2