Electronic-grade HF
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How to handle trivalent arsenic in the electronic-grade HF production process?
The information available online mentions things like activated carbon, oxidation with potassium permanganate, oxidation with hydrogen peroxide, electrolysis, and oxidation with fluorine gas; however, these techniques are considered trade secrets by various companies, so they don’t reveal the specifics of how they work.
The challenge in the production process of electronic-grade HF is how to handle arsenic.