Determination of 18 Trace Elements in 10 Batches of the Tibetan Medicine Qishiwei Zhenzhu Pills by Direct Inductively Coupled Plasma-Mass Spectrometry

Table 4

ICP-MS parameters.

ICP-MS system	Working parameters
RF power	1.3 kW
Carrier gas velocity	1.14 L/min
Sampling depth	6.8 mm
Auxiliary gas flow rate	0.9 L/min
Residence time per point	20 ms
Vertical position of rectangular tube	1.8 mm
Horizontal position of rectangular tube	0.6 mm
Atomizer	Babington
Atomization chamber flow rate	0.98 L/min
Atomization chamber pressure	2.85 × 10^5 Pa