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...acid to water and inert gases while leaving nitrates unreacted.<ref>{{cite patent|no=2139142A|cc=US|year=1934|title=Purification of materials containing nitr Potassium dichromate can oxidize nitrous acid<ref>{{cite pub|publication=American Journal of Pharmacy|volume=IX|year=1844|title=Puri

...bine [[apatite]] with excess [[carbon]] and [[silicon dioxide]]<ref>{{cite patent|1728948A|title=Phosphorus production}}</ref> '''Aluminum for the preparation of Phosphorus'''<ref>{{cite pub