| 质量指标 | Specification | GB 1886.328-2021 | FCC VII |
| 含量（Na2H2P2O7），w/% | Content (Na2H2P2O7),w/% ≥ | 94.0 | 93.0-100.5 |
| 砷（As），mg/kg ≤ | Arsenic (As),mg/kg ≤ | 3.0 | 3.0 |
| 氟化物（以F计），mg/kg ≤ | Fluoride (as F),mg/kg ≤ | 50.0 | 50.0 |
| 重金属（以Pb计），mg/kg ≤ | Heavy metal (as Pb),mg/kg ≤ | 10 | ———— |
| 水不溶物，w/% ≤ | Insoluble substances,w/% ≤ | 0.6 | 1.0 |
| 铅（Pb），mg/kg ≤ | Lead (Pb),mg/kg ≤ | 2.0 | 2.0 |
| pH（10g/L溶液） | pH (10g/L Solution) | 4.0±0.5 | ———— |
1、Chemical Name: Sodium Acid Pyrophosphate
2、Molecular Formula: Na2H2P2O7
3、Molecular Weight: 221.94
4、CAS: 7758-16-9
5、Character: It is white crystalline powder. Relative density is 1.862. It’s soluble in water, insoluble in ethanol. Aqueous solution is alkaline. It reacts with Fe2+ and Mg2+ to form chelates.
6、Usage: In food industry, it is used as buffering agent, swelling agent, chelating agent, stabilizer, emulsifier and color improver.
7、Packing: It is packed with polyethylene bag as inner layer, and a compound plastic woven bag as outer layer. The net weight of each bag is 25kg.
8、Storage and Transport: It should be stored in a dry and ventilative warehouse, kept away from heat and moisture during transportation, unloaded with care so as to avoid damage. Furthermore, it must be stored separately from poisonous substances.
