一、化学名：焦磷酸钠
二、分子式：Na4P2O7 ；Na4P2O7 ·10H2O
三、分子量：无水物：265.90 ；十水物：446.07
四、CAS：无水物：7722-88-5 ；十水物：13472-36-1
五、性状：十水物为无色或白色结晶或白色结晶性粉末，无水物为白色粉末。溶于水，水溶液呈碱性，不溶于乙醇及其他有机溶剂。与Cu2+, Fe3+, Mn2+等金属离子络合能力很强。在空气中易吸收水分潮解。
六、用途：在食品工业中作为食品品质改良剂，PH调节剂，金属离子螯合剂，乳化分散剂，粘合剂等。用于肉类及水产加工，可提高持水性，使肉质鲜嫩，稳定天然色素，防止脂肪腐败，另外，也用于酵粉，乳酪制造等。
七、包装：内衬聚乙烯塑料袋，外套复合塑料编织袋包装，每袋25kg。
八、贮存与运输：本品应贮存在干燥通风清洁的库房中，装载运输时要轻装轻放，防止包装破损，防止受潮、受热，运输过程中防止雨淋受潮，应与有毒物品隔离。
| 质量指标 | Specification | GB 1886.339-2021 | FCC VII | ||||
| 含量 | 无水（Na4P2O7），w/% | Content | Anhydrous(Na4P2O7),w/% | 96.5-100.5 | 95.0-100.5 | ||
| 十水（Na4P2O7·10H2O），w/% ≥ | Decahydrate(Na4P2O7·10H2O),w/% ≥ | 98.0 | ———— | ||||
| 水不溶物，w/% ≤ | Insoluble Substances,w/% ≤ | 0.2 | 0.2 | ||||
| pH值（10g/L溶液） | pH value(10g/L Solution ) | 9.9-10.7 | ———— | ||||
| 正磷酸盐，mg/kg ≤ | Orthophosphate,mg/kg ≤ | 通过试验 | ———— | ||||
| 砷（As），mg/kg ≤ | Arsenic (As),mg/kg ≤ | 3.0 | 3.0 | ||||
| 重金属（以Pb计），mg/kg ≤ | Heavy metal (as Pb),mg/kg ≤ | 10 | ———— | ||||
| 铅（Pb），mg/kg ≤ | Lead (Pb),mg/kg ≤ | 4.0 | 4.0 | ||||
| 氟化物（以F计），mg/kg ≤ | Fluoride (as F),mg/kg ≤ | 50.0 | 50.0 | ||||
| 灼烧失重，w/% | 无水物 ≤ | Loss on ignition,w/% | Anhydrous≤ | 0.5 | 0.5 | ||
| 十水合物 | Decahydrate | 38.0-42.0 | 38.0-42.0 | ||||
1、Chemical Name: Sodium Pyrophosphate
2、Molecular Formula: Na4P2O7 ; Na4P2O7·10H2O
3、Molecular Weight: Anhydrous:265.90 ; Decahydrate:446.07
4、CAS: Anhydrous:7722-88-5 ; Decahydrate:13472-36-1
5、Character: Decahydrate is colorless or white crystal or white crystalline powder. Anhydrous is white powder. It’s soluble in water, insoluble in ethanol or any other organic solvents. Aqueous solution is alkaline. Its’ chelating capacity of metal ions such as Cu2+, Fe3+, Mn2+ is very active.It absorbs moisture easily in the air.
6、Usage: It is used as quality improver,PH regulator, chelating agent, emulsifier and binder in food industry. For meat and aquatic products, it could improve water holding capacity to keep them tender,stabilize natural pigment and prevent fat from corrosion. It also can be used in production of baking powder and cheese.
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.