Agilent Technologies 7500 ICP-MS Operator's Manual page 155

Agilent 7500 ICP-MS ChemStation Operator's Manual
Tuning
Typical values of Sensitivity (He Mode)
Mass
59
Co
2 Adjustment of He gas flow rate
The higher the flow of He gas, the lower the intensity of the sample and
background. Adjust the flow in order to make the background low enough and
to get a necessary level of sensitivity. To optimize the flow of He use 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 rates 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 He gas.
Reaction Gas Tuning Window
2) Aspirate the tuning solution.
3) Set the mass number and integration time by selecting Acq.Params.
Count/1 ppb
Integration time = 0.1 sec.
> 3000
RSD
< 15%
4-79