Table 1.

ICP-MS operating conditions.

ICP-MS tuning parameters
Oxide ratio (156/140)	0.775%
Doubly charged (70/140)	1.485%
Plasma condition
RF power	1200 W
RF matching	1.76 V
Sample depth	8 mm
Torch horizontal	0.8 mm
Torch vertical	0 mm
Carrier gas	1.02 L/min
Nebulizer pump	0.1 r/s
S/C temperature	2 °C
Ion lenses
Extract 1	−101.2 V
Extract 2	−5 V
Einzel 1, 3	−100 V
Einzel 2	11 V
Omega bias	−40 V
Omega (+)	2.4 V
Omega (−)	−2 V
QP focus	2 V
Plate bias	−4.2 V
Q-pole parameters
AMU gain	130
AMU offset	125
Axis gain	0.9998
QP bias	−8 V
Detector parameters
Discriminator	8 mV
Analog HV	1740 V
Pulse HV	1200 V

S/C: spray chamber; AMU: atomic mass unit; QP: Q-pole; HV: high voltage.