含量，w/%...................................................................≥99.8
酸度（以H+计）（mmol/L）...........................................≤0.05
碱度（以OH-计）（mmol/L）..........................................≤0.02
蒸发残渣，w/%............................................................≤0.001
水分（H2O），w/%.......................................................≤0.05
最小紫外透过率（1cm池，参比：水）
275nm.........................................................................≥50%
280nm.........................................................................≥80%
295nm.........................................................................≥98%