无色或白色斜方晶系结晶。易溶于水，其水溶液呈酸性；不溶于醇。在湿空气中易结块。加热至95℃时脱水成无水物，在190～204℃时转化成酸式焦磷酸钠，在204～244℃时形成偏磷酸钠。
熔点  <0°C 
沸点  100°C 
密度  1.40 g/mL at 20 °C

Q/(HG)SJ 715-1996
项目Item　　　　　　　           　　   分析纯　 化学纯
                                                                  (AR)     (CP)
含量(NaH2PO4)Assay,%                     ≥99.0      98.0
PH(50g/L,25℃)PH                               4.2-4.8   4.2-4.8
澄清度试验Clarity　                               合格　　  合格
水不溶物lnsoluble matter in water,%    ≤0.03　　  0.05
氯化物(Cl)Chloride,%                            ≤0.005　　 0.01
硝酸盐(NO3)Nitrate,%　　                    ≤0.005　　 0.01
钾(K)Potassium,%                                 ≤0.04      0.08
铁(Fe)Iron,% 　　　　　                        ≤0.001     0.005
砷(As)Arsenic,%                                     ≤0.0005    0.0008
重金属(以Pb计)Heavy metals,%           ≤0.003     0.005
氨沉淀物Snbstances precipitated        ≤0.01      0.02
by Ammonia,%


99.999% metals basis：


外观Appearance                          白色粉末或块状物
X-射线衍射分析X-Ray Diffraction         Conforms to Structure
纯度Purity                              ≥99.999% Based On Trace Metals Analysis
ICP:                                    Confirms Na and P Components Confirmed 
磷P                                     25.5 - 26.0 % （Titration NaOH）
痕量金属分析Trace Metal Analysis        ≤20ppm by ICP Atomic emission
(B、Ba、Ca、Fe、Mg、Zn)
痕量金属分析Trace Metal Analysis        ≤20ppm by Atomic Absorption 
(Li、K、Rb、Cs) 



品级Grade                               分子生物学级   
                               (for molecular biology, anhydrous, ≥99%) 
外观Appearance                          白色至类白色粉末
红外光谱鉴别Infrared spectrometry       Conforms to Structure
纯度Purity                              ≥99.0%   
水溶解试验solubility in water           clear colorless ，100mg/ml in water 
水分water                               ≤0.5%(K.F)
氯chloride (Cl-):                       ≤40 ppm 
铁Fe:                                   ≤30 ppm 
DNase, RNase and protease,              none detected 



品级Grade                               细胞与昆虫细胞培养级   
                              (for cell culture, for insect cell culture) 
外观Appearance                           白色至类白色粉末
纯度Purity                               ≥99.0% (中和滴定)   
水溶解试验solubility in water            clear colorless ， 10g plus in 100ml water 
细胞培养测试Cell culture test             pass
昆虫细胞培养测试Insect cell culture test  pass



品级Grade                              色谱纯   
                                      (grade for HPLC ) 
含量assay                               ≥99.0% (T) 
pH                                      4.0-4.5 (20 °C, 10% in H2O) 
solubility H2O:                         soluble0.1 g/mL at 25 °C, clear, colorless 
λ 10 % in H2O 
UV absorption 
  λ: 210 nm A:                          ≤0.1 
  λ: 260 nm A:                          ≤0.06 
  λ: 280 nm A:                          ≤0.04 
  λ: 320 nm A:                          ≤0.02 
  λ: 500 nm A:                          ≤0.02 
RP gradient test                        corresponds to standard
filter test                             corresponds to standard

用途  用作分析试剂、缓冲剂和软水剂 
用途  用于锅炉水处理、电镀、制革、染料、医药、食品等工业 
本品应密封干燥保存。