Ultraclean nitric acid (HNO3) is product of multi-stage distillation of commercial aquafortis with acid vapors washing by phlegm, followed by condensation and dilution to required concentration by distilled water in quartz glass apparatus. Ultraclean nitric acid is used for production of semi-conductors, electronics, metals and alloys, catalysts, ion exchangers, laser devices, rare components, and also for accurate scientific investigations. Ultraclean nitric acid of grades 27-4, 27-5 and 33-4 represents colorless or slightly yellowish smudge liquid, which decomposed with nitrogen oxides emissions while heating.
Main technical characteristics
|Mass fraction of nitric acid, %, no less than||70|
|Mass fraction of nitrogen oxide, %, not more than||0.1|
Ultraclean nitric acid is poured in 20-litre glass bottles, which are immediately closed with locking devices. The glass bottles are set in polyethylene barrels. The product may be transported by all transport means.
Bottles with ultraclean nitric acid are stored in dark simple storage rooms apart from other reagents, under the temperature not exceeding 30°С. Shelf life from the date of production:
- for Ultraclean nitric acid 18-4: 4 months;
- for Ultraclean nitric acid 27-4: 3 months;
- for Ultraclean nitric acid 27-5: 2 months.