Standard for liquid CO2 of food grade（GB10621-2006）
2018-04-25
| No. | Item | Index |
| 1 | Volume fraction of CO2 content (10-2) | ≥ 99.9 |
| 2 | Volume fraction of moisture (10-6) | ≤20 |
| 3 | Acidity | Acceptance check according to 5.4 |
| 4 | Volume fraction of nitrogen oxide (10-6) | ≤ 2.5 |
| 5 | Volume fraction of nitrogen dioxide (10-6) | ≤2.5 |
| 6 | Volume fraction of sulfur dioxide (10-6) | ≤ 1.0 |
| 7 | Volume fraction of total sulfur (calculate according to sulfur, exclude sulfur dioxide) (10-6) | ≤ 0.1 |
| 8 | Volume fraction of total hydrocarbon (calculate according to methane) (10-6) | ≤50 (Thereinto nonmethane hydrocarbons is less than 20) |
| 9 | Volume fraction of benzene (10-6) | ≤0.02 |
| 10 | Volume fraction of methanol (10-6) | ≤ 10 |
| 11 | Volume fraction of ethanol (10-6) | ≤10 |
| 12 | Volume fraction of aldehyde (10-6) | ≤0.2 |
| 13 | Volume fraction of other oxy-organics (10-6) | ≤ 1.0 |
| 14 | Volume fraction of Chloroethylene (10-6) | ≤0.3 |
| 15 | Mass fraction of axunge (10-6) | ≤5 |
| 16 | Odor, taste and aspect of aqueous solution | Inspect to qualified according to 5.10 |
| 17 | Mass fraction of evaporation residue (10-6) | ≤10 |
| 18 | Volume fraction of oxygen (10-6) | ≤ 30 |
| 19 | Volume fraction of carbon monoxide (10-6) | ≤10 |
| 20 | Volume fraction of ammonia (10-6) | ≤2.5 |
| 21 | Volume fraction of phosphine (10-6) | ≤0.3 |
| 22 | Volume fraction of hydrogen cyanide (10-6) | ≤0.5 |
| Remarks: other oxy-organics include dimethyl ether, epoxy ethane, acetone, n-propanol, isopropanol, n-butyl alcohol, isobutanol, ethyl acetate and isoamyl acetate. | ||