Table 4 Comparison of digestion processes between two pretreatment methods
From: Gold determination in soil by ICP-MS: comparison of sample pretreatment methods
Comparative content | Method I | Method II |
|---|---|---|
Weighing amount/g | 10.0000 | 0.2500 |
Acid used | 50% aqua regia | 50% aqua regia +Â HF |
Acid dosage/mL | 50 | 10 + 1 = 11 |
Digestion time/h | 8 | 2 |
The amount of samples simultaneously digested | 40 | 8 |
Sample digestion state | Light yellow brown liquid with some solid particles | Transparent liquid without solid particles |
Labor consumption | Full manual supervision | Automated, unsupervised |
Environmental and health impact | A lot of acid mist was generated to harm the respiratory tract, high temperature was easy to cause burns | No acid mist, no significant impact on the environment and health |