Agilent Technologies 7500 ICP-MS

4-50
Agilent 7500 ICP-MS ChemStation Operator’s Manual
Tuning
h.(Background Check) Aspirate fresh DI water and measure the background
of mass (56 amu and 78 amu), which is to be measured in H
2
mode. If the
count of 56 amu and 78amu is too high, increase 0.4 mL/min of H
2
flow rate,
and then repeat step e to step g.
Typical values of Tuning Parameters in the H
2
Mode
(with ShieldTorch, MicroMist Nebulizer)
Typical values of Sensitivity (H
2
Mode)
2 Adjustment of H
2
gas flow
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 -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) -3 -Normally used -16
H
2
Gas (ml/min) 5 3 to 6
Mass Count/1 ppb
Integration time = 0.1 sec.
RSD
89
Y
>2000 < 15%