指標名稱 

　　             液體指標                           固體指標 

　　含量          56~60%                          　 ≥98% 

　　外觀        無色透明液體                        白色結(jié)晶　

　　亞硫酸銨      ≤1.0%                             ≤1.0%

　　堿度          0.3~1.5%                          ≤0.4%

不溶物(鈣、鎂沉淀)   ≤0.2%                           --- 

重金屬(以鉛計)       ≤0.001%                       ≤0.002%

鐵(Fe)              ≤0.00025%                     ≤0.001%

硫化物(以硫計)      ≤0.0002%                      ≤0.0002% 

灼燒殘渣            ≤0.1%                           ≤0.2%

比重 　　         1.310~1.335