性狀 具潮解性，能溶于水、醇，微溶于醚。水中溶解度：300g/100ml (20 C) 
  
備注:  以上描述，僅作參考，并不表示您收到的產品，與此項描述完全相符，產品的出廠標準，請參見質量標準。
質量標準  
  品級Grade                               超純級
外觀APPEARANCE                          白色粉末或結晶
純度Purity                              >99.0% (中和滴定)
灼燒殘渣RESIDUE ON IGNITION             ≤ 0.05%
氯離子CHLORIDE                          ≤0.05%
禁發 硫酸根離子SULFATE                       ≤ 0.05%
不溶物INSOLUBLE MATTER                  ≤0.1%
鋁ALUMINUM                              ≤ 0.0005%
鈣CALCIUM                               ≤0.0005%
銅COPPER                                ≤0.0005%
鐵IRON                                  ≤0.002%
鉛LEAD                                  ≤0.001%
鎂MAGNESIUM                             ≤0.0005%
磷酸PHOSPHORUS                          ≤0.0005%
鈉SODIUM                                ≤0.005%
鋅ZINC                                  ≤ 0.0005%
鉀POTASSIUM                             ≤0.005%

ACS級
項目名稱Item                                       ACS Grade
含量Assay                                           99.0-101.0%
水不溶物Insoluble matter                            ≤0.01%
灼燒殘渣Residue after ignition                      ≤0.01%
其他鹵素(以Cl計)Other halogen(as Cl)                ≤0.01%
禁發 硫酸鹽(SO4)Sulfate                                  ≤0.01%
重金屬(以Pb計)Heavy metals(as Pb)                   ≤0.005%
鐵(Fe)Iron(Fe)                                      ≤0.003%