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Agilent 7500 ICP-MS ChemStation Operator’s Manual
Tuning
Typical values of Tuning Parameters in the He Mode
(with ShieldTorch, Micro Mist Nebulizer)
Typical values of Sensitivity (He Mode)
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:
Parameter Typical Value Adjustment
RF Power (W) 1500 Normally used 1500
Sampling Depth (mm) 8 7 to 10
Carrier Gas (L/min) 0.9 Normally used 0.9
Makeup Gas (L/min) 0.15 0.1 to 0.3
PeriPump 1 (rps) 0.1
S/C temp (
ºC)
2
Normally used at 2ºC
Extract 1 (V) 4.0 2 to 6
Extract 2 (V) -140 -140 to 0-110
Omega Bias
-ce (V)
-22 -30 to -16
Omega Lens-ce (V)
1.2 -2 to 3
Cell Entrance (V) -26 -40 to -20
QP Focus (V) -15 -20 to 0
Cell Exit (V) -30 -80 to -20
OctP RF (V) 150 100 to 200
OctPBias (V) -18 Normally used -18
QP Bias (V) -16 -Normally used -16
He Gas (ml/min) 3.5 2.5 to 5.5
Mass Count/1 ppb
Integration time = 0.1 sec.
RSD
59
Co
> 1000 < 15%
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