无水磷酸二氢钠

性状描述: 无色斜方晶系结晶。无味。微吸湿。加热至225-250℃生成酸性焦磷酸钠，350-400℃形成偏磷酸钠。半数致死量(大鼠，肌肉)250mg/kg。易溶于水，水溶液呈酸性，在湿空气中能结块，几乎不溶于乙醇。加热至100℃时则脱水，在190－210℃时生成焦磷酸钠，在280－300℃分解为偏磷酸钠。水中溶解度:850 g/L (20°C)
熔点：60℃
比重：1.91

质量标准: 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

储存条件: 易吸潮，密封保存。

用途: 缓冲剂,软水剂。医药工业用于制兴奋剂和果子盐。用作洗涤剂、酸度缓冲剂和染料的助剂，也用于锅炉水处理、云母片砌合、焙粉制造和电镀等。