Международный стандарт ISBT (International Society of Beverage Technologist)
| % Purity | 99.9% min |
| Moisture | 20 ppm v/v max |
| Oxygen | 30 ppm v/v max |
| Carbon Monoxide | 10 ppm v/v max |
| Ammonia | 2.5 ppm v/v max |
| Nitric Oxide/Nitrogen Dioxide | 2.5 ppm v/v each max |
| Non-volatile Residue (NVR) | 10 ppm w/w max |
| Non-volatile Organic Residue (NVOR) | 5 ppm w/w max |
| Phosphine | 0.3 ppm v/v max |
| Total Volatile Hydrocarbons (THC as Methane) | 50 ppm v/v max |
| Total Non-methane Hydrocarbons (TNMHC) | 20 ppm v/v max |
| Acetaldehyde | 0.2 ppm v/v max |
| Aromatic Hydrocarbon Content (as benzene) | 20 ppb v/v |
| Total Sulfur Content (less SO2) | 0.1 ppm v/v |
| Sulfur Dioxide | 1 ppm v/v max |
| Odor of Solid CO2 (Snow) | no foreign odor (без вкуса) |
| Appearance in Water | no color or turbidity |
| Odor & Taste in Water | no foreign odor or taste |