Agilent Technologies 7500 ICP-MS Operator's Manual page 131

Agilent 7500 ICP-MS ChemStation Operator's Manual
Tuning
Typical values of Tuning Parameters in the He Mode
(with ShieldTorch, Micro Mist Nebulizer)
Parameter
RF Power (W)
Sampling Depth (mm)
Carrier Gas (L/min)
Makeup Gas (L/min)
PeriPump 1 (rps)
ºC
S/C temp ( )
Extract 1 (V)
Extract 2 (V)
-ce
Omega Bias (V)
-ce
Omega Lens
Cell Entrance (V)
QP Focus (V)
Cell Exit (V)
OctP RF (V)
OctPBias (V)
QP Bias (V)
He Gas (ml/min)
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:
Typical Value
1500
8
0.9
0.15
0.1
2
4.0
-140
-22
1.2
(V)
-26
-15
-30
150
-18
-16
3.5
Count/1 ppb
Integration time = 0.1 sec.
> 1000
Adjustment
Normally used 1500
7 to 10
Normally used 0.9
0.1 to 0.3
ºC
Normally used at 2
2 to 6
-140 to 0-110
-30 to -16
-2 to 3
-40 to -20
-20 to 0
-80 to -20
100 to 200
Normally used -18
-Normally used -16
2.5 to 5.5
RSD
< 15%
4-55