Agilent Technologies 7500 ICP-MS Operator's Manual page 150

Agilent 7500 ICP-MS ChemStation Operator's Manual
Tuning
2 Adjustment of H gas flow
2
The higher the flow of H
background. Adjust the flow in order to make the background low enough and
to get a necessary level of sensitivity. To optimize the flow rate of H
the ICP-MS Tuning-Reaction Gas Window as follows:
1) Select Tune>>Reaction Gas in the ICP-MS Tuning Window.
The ICP-MS Tuning-Reaction Gas Window will appear.
In this window, the data of the tuning and blank solutions are collected as the gas
flow change. The Graph button will produce a graph of the sensitivity and BEC
(Background Equivalent Concentration). This graph will help to determine the
flow rate of H gas.
2
Reaction Gas Tuning Window
2) Aspirate the tuning solution.
3) Set the mass number and integration time by selecting Acq.Params.
4) Input the concentration of each mass number of the tuning solution in Std
Conc Text Box and select the concentration unit in Conc Unit.
5) Select Std (standard solution) in Current Solution.
6) Select H Gas in the Ramp Flow group and input the minimum value,
2
maximum value, and the step size of the H
Rate.
4-74
gas, the lower the intensity of the sample and the
2
gas flow rate to adjust the Flow
2
gas use
2