性状：能溶于水。水溶液呈酸性。急热到约75℃熔融，在100℃时失去11分子结晶水，到200℃时也不完全脱水。熔于3.5份水和1份沸水，不溶于乙醇。在水 溶液中几乎完全分解为磷酸氢二钠和氢氧化钠，有强碱性，0.1%溶液的pH为11.5。微毒，半数致死量(大鼠，经口)7.40g/kg。有腐蚀性。水中 溶解度:258 G/L(20°C)。

备注: 以上描述，仅作参考，并不表示您收到的产品，与此项描述完全相符，产品的出厂标准，请参见质量标准。

质量标准：

HG/T 3-1292-80
项目Item                                    分析纯(AR)         化学纯(CP)
含量(Na₃PO₄·12H₂O)Assay,%             ≥  98.0               97.0
澄清度试验Clarty                             合格               合格
氯化物(Cl)Chloride,%                      ≤ 0.005              0.005
硫酸盐(SO₄)Sulfate,%                      ≤ 0.01               0.03
重金属(以Pb计)Heavy metals,%        ≤ 0.001              0.002
铁(Fe)Iron,%                                ≤ 0.0005             0.002
游离碱Free alkalies,%                     ≤ 1.5                 3.0
二钠盐Disodium salt,%                    ≤ 0.5                 1.0
氮化合物(N)Nitiogen compounds,%    ≤ 0.002              0.005
砷(As)Arsenic,%                           ≤ 0.0003             0.001

ACS级
项目名称　                                                     ACS Grade
含量(Na₃PO₄·12H₂O)Assay                                  98.0-102.0%
游离碱（以NaOH计）Excess alkali(as NaOH)         ≤2.5%
水不溶物Insoluble matter                                   ≤0.01%
氯化物(Cl)Chloride(Cl)                                      ≤0.001%
硫酸盐(SO₄)Sulfate                                           ≤0.01%
重金属(以Pb计)Heavy metals(as Pb)                     ≤0.001%
铁(Fe)Iron                                                      ≤0.001%

≥99.99% metals basis：

外观Appearance                                  白色结晶
X-射线衍射分析X-Ray Diffraction         Conforms to standard
纯度Purity                  ≥99.99% based on trace metals analysis of icp and aa combined of 100 ppm
ICP assay                                      confirms sodium and phosphorus components.
总金属杂质total metallic impurities    ≤100ppm by ICP Atomic emission
总金属杂质total metallic impurities    ≤100ppm by atomic absorption
含量Assay                                     98.0% - 102.0% (Titration with HCL)
不溶物Insoluble matter                    ≤0.01%  (c=10%, H2O+ HCL)
氯Chloride                                    ≤0.001%
过剩碱excess alkali                       ≤2.5%  (as NaOH)
铁iron                                         ≤0.001%
重金属heavy metals                        ≤0.001%(as pb)
硫酸盐sulfate                               ≤0.01%

贮存：密封保存

用途：软水剂，照相显影剂，清洁剂。

联合国编号 3262

Risk： R35-

Safety : S26 - S36/37/39- S45-

Hazard : C -