Agilent Technologies 7500 ICP-MS Operator's Manual page 106

Agilent 7500 ICP-MS ChemStation Operator's Manual
Tuning
8 Adjust the Carrier Gas and Makeup Gas flow rate.
9 Adjust the PeriPump (sample flow rate).
10 Adjust lens parameters.
1) Adjust the extraction lenses.
Adjust the Extract 1 in 10V increments until reaching a plateau sensitivity, and then
adjust the Extract 2 in 1V increments until reaching a plateau sensitivity. Repeat
this until no more increase in sensitivity is achieved.
2) Adjust the Omega(+). Only small increments will be necessary.
3) Adjust the Omega(-). Only small increments will be necessary.
4) Adjust the QP Focus. Only small increments will be necessary.
5) Adjust the Einzel 2. Only small increments will be necessary.
Adjust the tuning parameter until the signals are stable and the sensitivity is high.
The Following are examples of sensitivity:
Example of Sensitivity (High sensitivity tuning)
Element
Mg (24 amu)
Y (89 amu)
Tl (205 amu)
4-30
Counts / 1 ppb (Integ. : 0.1sec)
> 13,000
> 45,000
> 18,000