一、化学名：磷酸氢二钠
　　二、分子式：na2hpo4，na2hpo4·2h2o，na2hpo4·12h2o
　　三、分子量：无水物：141.96;二水物：177.99;十二水物：358.14
　　四、cas：无水物：7558-79-4;二水物：10028-24-7;十二水物：10039-32-4
　　五、性能：白色或无色斜方晶体或单斜晶系结晶，易溶于水，不溶于乙醇，相对密度为1.52，熔点34.6℃，180℃时失去结晶水成无水物。
　　六、用途：食品中作焙制品，防止氧化变色，奶制品的乳化剂，防止蛋白凝固，固体饮料起螯合，乳化缓冲作用。
　　七、包装：内衬聚乙烯塑料袋.外套复合塑料编织袋，每袋净重25千克。
　　八、贮存与运输：本品应密封贮存于干燥通风的仓库中，防止受潮、受热，与有害有毒物品隔离堆放。运输装卸时应轻装轻放。防止包装破损。
质量指标
specification
gb 25568-2010
含量na2hpo4（以干基计），w/%          ≥
assay(na2hpo4)
98.0
砷（as），mg/kg                          ≤
as
3
重金属（以pb计），mg/kg                 ≤
heavy metal(pb)
10
铅（pb），mg/kg                          ≤
pb
4
氟化物（以f计），mg/kg                  ≤
fluorides
50
水不溶物，w/%                          ≤
insoluble in water
0.2
干燥减量，w/%
na2hpo4                 ≤
loss on drying
5.0
na2hpo4·2h2o 
18.0~22.0
na2hpo4·12h2o           ≤
61.0
1.chemical name: disodium phosphate
　　2.molecular formula:, na2hpo4,na2hpo4'2h2o,na2hpo4'12h2o
　　3.molecular weight: anhydrous: 141.99; dihydrate: 177.96;dodecahydrate: 358.14
　　4.cas: anhydrous: 7558-79-4; dihydrate: 10028-24-7; dodecahydrate: 10039-32-4
　　5.character: it is white or colorless rhombic crystalline or prismatic crystal. it's easily soluble in water, but insoluble in ethanol. the relative density is 1.63 and melting point is 34.6. if heated to 180,it may lose crystal water and convert to anhydrous.
　　6.usage: in food industry, it is used as agent for baking to avoid oxidation stain and as emulsifier in dairy product to prevent egg white from solidification. it is also used as emulsifier and chelating agent for solid drinks.
　　7.packing: it is packed with polyethylene bag as liner and a compound plastic woven bag as the outer layer. the net weight of each bag is 25kg.

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