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

Table 3

Microwave digestion steps.

No.	Steps
Step 1	Temperature rises to 120°C within 15 min and maintains for 5 min at 1600 W power.
Step 2	Temperature rises to 150°C within 7 min and maintains for 7 min at 1600 W power.
Step 3	Temperature rises to 190°C within 7 min and maintains for 15 min at 1600 W power.