焦磷酸钠（十水）

性状说明：白色粉状或结晶。相对密度2.534，熔点880℃，沸点93.8℃，比重2.534。无色透明结晶或白色结晶粉末。易溶于水，20℃时100g水中的溶解度为6.23，其水溶液呈碱性；不溶于醇。水溶液在70℃以下尚稳定，煮沸则水解成磷酸氢二钠。在干燥空气中风化，在100℃失去结晶水。在空气中易吸收水分而潮解。与碱土金属离子能生成络合物；与Ag+相遇时生成白色的焦磷酸银。

执行标准：

感官要求：

项目	要求
色泽	白色
组织状态	粉末或结晶

理化指标：

项目	指标
十水合焦磷酸钠（Na₄P₂O₇·10H₂O）,ω/% ≥	98.0
正磷酸盐	通过试验
PH（10g/L溶液）	9.9-10.7
砷（As）/（mg/kg） ≤	3
氟化物（以F计)/（mg/kg） ≤	50
重金属（以Pb计）/（mg/kg）≤	10
铅（Pb）/（mg/kg） ≤	4
水不溶物，ω/% ≤	0.2
灼烧减量	38.0-42.0
a:灼烧减量（Na₄P₂O₇）指标为出厂时检验指标。

用途说明：在食品加工中做酸度调节剂、水分保持剂。用于午餐肉，香肠等肉类罐头，可提高肉制品的持水能力，减少营养成分的损失，提高肉的柔嫩性，改善成品质量；作为干燥的熔融剂、乳化剂使用，可使干酪中的酪蛋白酸钙释放出钙，使酪蛋白的黏度增大，得到柔软的，富于伸展性的制品；用于酱油、豆酱加工，可防止豆酱褐变，改善色泽，抑制豆浆酸败、发酵；用于果汁、清凉饮料、冷饮加工，可防止氧化和在保存中产生沉淀；用于冰淇淋加工，有使其增量和乳化分散的效果。

使用原则及用量：使用原则、使用范围、最大使用量或残留量等详见CB 2760-2014k《食品安全国家标准食品添加剂使用标准》中的规定。

注：食品级焦磷酸钠在使用和储存、运输等过程中需严格按照食品安全管理相关内容执行。

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