硼酸

Boric acid

CAS号：10043-35-3	MDL号：MFCD00011337
分子量：61.83	EINECS号：233-139-2
分子式：H3BO3	分子结构:
别名：

硼酸的化学性质,质量标准及用途

化学性质

• 硼酸实际上是氧化硼的水合物（B2O3.3H2O）,为白色粉末状结晶或三斜轴面鳞片状光泽结晶，有滑腻手感，无臭味。比重1.435（15ºC）。溶于水、酒精、甘油、醚类及香精油中，水溶液呈弱酸性。硼酸在水中的溶解度随温度升高而增大，并能随水蒸汽挥发；在无机酸中的溶解度要比在水的溶解度小。加热至70～100℃时逐渐脱水生成偏硼酸，150～160ºC时生成焦硼酸，300℃时生成硼酸酐（B2O3）.

质量标准

•  1.  AR  2.  PT  3.  GR   4. 4N   5.  SP
• 指标名称            标 准
  
• 含量                      ≥99.0%
  
• 水不溶物              ≤0.02%
  
• 铁(Fe)                  ≤20ppm
  
• 钠(Na)                  ≤30ppm
  
• 锌(Zn)                  ≤20ppm
  
• 铜(Cu)                  ≤20ppm
  
• 钾(K)                    ≤30ppm 
  
• 铵 (NH4)            ≤20ppm
  
• 磷酸盐(PO4)      ≤30ppm

项目Item                                                            分析纯         化学纯
                                                                             (AR)              (CP)
含量(H3BO3)Assay,%                                       ≥ 99.5         99.0
磷酸盐(PO4)Phosphate,%                                ≤ 0.0005     0.003
钙(Ca)Calcium,%                                                ≤ 0.002       0.01
铁(Fe)Iron,%                                                         ≤ 0.0005     0.002
砷(As)Arsenic,%                                                   ≤ 0.0001    0.0005
铅(Pb)Lead,%                                                       ≤ 0.001       0.003
澄清度试验Clarity                                                 合格             合格
水不溶物Insoluble matter in water                       ≤ 0.005      0.02
乙醇溶解度试验Solubility in ethanol                      合格           合格
甲醇不挥发物(以硫酸计)Novolatile with methanol,%      ≤ 0.05    0.3
氯化物(Cl)Chloride,%                                             ≤ 0.0005    0.002
硫酸盐(SO4)Sulfate,%                                           ≤ 0.002        0.01

项目                                                              优级纯  
                                                                     (GR)
含量Assay                                                   ≥99.8% 
甲醇不挥发物Novolatile with methanol     ≤0.05% 
磷酸盐Phosphate                                       ≤0.0005% 
硫酸盐Sulfate                                              ≤0.0005% 
氯化物Chloride                                           ≤0.0003% 
镁magnesium                                              ≤0.0005% 
砷(As)Arsenic                                              ≤0.00001% 
水不溶物Insoluble matter in water                     ≤0.005% 
铁(Fe)Iron                                                       ≤0.0001% 
乙醇溶解试验Solubility in ethanol                     合格 
重金属Heavy metals                                      ≤0.0005% 
澄清度试验Clarity                                           合格 
钙(Ca)Calcium                                                ≤0.002% 

ACS级
项目名称Item                                                    ACS Grade
含量Assay                                                         ≥99.5%
铁(Fe)Iron(Fe)                                                    ≤0.001%
钙(Ca)Calcium(Ca)                                           ≤0.005%
不溶物Insoluble matter                                      ≤0.005%
甲醇不挥发物Novolatile with methanol           ≤0.05%
氯化物(Cl)Chloride(Cl)                                     ≤0.001%
磷酸盐(PO4)Phosphate                                  ≤0.001%
硫酸(SO4)Sulfate                                             ≤0.01%
重金属(以Pb计)Heavy metals(as Pb)            ≤0.001%
基准试剂PT
纯度Assay: 　　99.95-100.05%