一、化学名称：磷酸二氢钠
二、分子式：NaH2PO4，NaH2PO4·H2O，NaH2PO4·2H2O
三、分子量：无水物：120.01;一水物：138.01;二水物：156.01
四、CAS：无水物：7558-80-7;一水物：10049-21-5;二水物：13472-35-0
五、性能：无色柱状结晶。无臭。稍有潮解性。相对密度2.04。熔点60℃。易溶于水。不溶于乙醇。100℃以下加热，可溶于结晶水形成一水盐。加热至100℃失去结晶水而成无水物，继续加热则变为偏磷酸钠。
六、用途：缓冲剂;品质改良剂;乳化剂;营养增补剂;抗氧化增效剂;盐水穿透助剂;糖澄清剂;稳定剂;凝胶剂;禽类烫毛剂。
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：应贮在干燥，通风清洁的库房中。
质量指标 | Specification | GB
25564-2010 |
含量(以干基计) , w/% | Content (NaH2PO4) | 98.0-103.0 |
pH (10g/L溶液) | pH-Value | 4.1-4.7 |
水不溶物 , w/% ≤ | Insoluble
In Water | 0.2 |
重金属(以Pb计)，mg/kg ≤ | Heavy
Metal(Pb) | 10 |
铅 (Pb)，mg/kg ≤ | Pb | 4 |
砷(As)，mg/kg ≤ | As | 3 |
氟化物( 以F计)，mg/kg ≤ | Fluorides
(F) | 50 |
干燥失重, w/% | NaH2PO4 ≤ | Loss
On Drying | 2.0 |
NaH2PO4·H2O | 10.0-15.0 |
NaH2PO4·2H2O | 20.0-25.0 |
1. Chemical Name: monosodium phosphate
2. Molecular Formula: NaH2PO4,NaH2PO4'H2O,NaH2PO4'2H2O
3. Molecular Weight: Anhydrous: 120.01; Monohydrate: 138.01; Dihydrate:
156.01
4. CAS: Anhydrous: 7558-80-7; Monohydrate: 10049-21-7; Dihydrate:
13472-35-0
5. Character: It is colourless column crystal, odorless, slightly
deliquescence. The relative density is 2.04 and melting point is 60. It is
easily soluble in water but insoluble in ethahol. If heated below 100, it can
dissolve in crystal water and convert to monohydrate salt. When heated to 100,
it will lose crystal water and change its anhydrous substances, which will
become sodium metaphosphate if it's continue to be heated.
6. Usage: In food industry, it is used as buffering, character improving
agent, emulsifier, nutrition supplement, antioxidant additive, brine penetrable
agent, sugar clarifier, stabilizer, coagulant, fowl scalding agent.
