1. 准确称取粉末样品50 ± 1 mg置于Teflon坩埚中；
2. 用1-2滴高纯水润湿样品，然后依次加入1 ml HNO3 和1 ml HF（顺序不能颠倒）（如果溶解橄榄岩样品，则需加入1ml H2O）；
3. 将Teflon坩埚放入钢套，拧紧后置于烘箱中于190 ± 5 °C 加热>48h；
4. 待溶样弹冷却，开盖后置于电热板上（115°C）蒸干，然后加入1 ml HNO3 并再次蒸干（保证Teflon坩埚壁无液体）（如有黑色悬浮物，则蒸干后加入1~2滴HClO4，再次蒸干）；
5. 加入3ml 30% HNO3，再次将Teflon坩埚放入钢套，拧紧后置于烘箱中于190 ± 5 °C 加热>12h（如果溶解橄榄岩样品，则应延长时间）；
6. 将溶液转入聚乙烯料瓶中，并用2% HNO3稀释至~100g (对应的稀释因子为2000)后，密闭保存以备ICP-MS测试。
Sample Preparing for ICP-MS Analysis
1、About 50 mg of sample powder was weighed into a Teflon bomb,
2、Moistened with a few drops of ultrapure water, followed by addition of 1 ml HNO3 and 1 ml HF.
3、The sealed bomb was heated at 190°C in oven for >48 h.
4、After cooling, the bomb was opened and evaporated at 115 °C to incipient dryness. This was followed by adding 1ml HNO3 and evaporating to the second round of incipient dryness.
5、The resultant salt was re-dissolved by adding 3 ml of 30% HNO3 and resealed and heated in the bomb at 190°C for >12 h.
6、Finally, the final solution was transferred to a polyethylene bottle and diluted to ~100 g (corresponding to a dilution factor of ~2000) with mixture of 2% HNO3 for ICP-MS analysis. 
