Dissolution process of terrestrial sediments, for identifying major and trace elements, with AlF3 insoluble substance formation.
- How to dissolve these samples？
- Are the AlF3 formation because of samples are too high in aluminum?
Thanks for your answer!
My previous process is:
- 50mg sample powder dissolved in 1.5ml HF, heat at 120℃, close to dry
- followed by 1 ml HNO3 and 1.5 ml HF mixture, airtight heating 72 hours, 190℃
- add 1 ml HNO3, heat at 120℃, close to dry, twice
- add 1.5 ml HNO3 and 2 ml H2O, airtight heating 12 hours, 120℃
the best technique is microwave digestion. Hotplate might be useful, but some minerals simply not dissolve. Hotplate didn't help me to dissolve shales, sandstone, mudstones.
Try different acids, like HNO3 : HCl (3:1) aqua regia, HF, HClO4.
I used 50 mg of sample (crushed) added 6:3 ml aqua regia, 3 ml HF and 1 ml of HClO4 - put do digestion for 40 min, @ 180C and 1500-1800 MW.
Dissolves almost everything, very useful for such techniques as ICP-MS, OES etc.
Thank you! Yeltay! I had tried hotplate, and oven, but dissatisfactory；I find some methods with unusual reagent（for me）, therefore, not try them; if u want these methods, I would like to send it to you. :D
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