Methods Non-aqueous titration method was ~performed with glacial acetic acid and acetic anhydride as the solvent, and perchloric acid as the titrant followed by the electric potential titrimetry.

• 方法采用电位滴定法,以冰乙酸加乙酐作溶剂,照电位滴定法用高氯酸滴定液滴定。