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采用一种新的混合溶剂体系,用pH电位滴定法测定了三种新近合成的4-酰基吡唑啉酮类螯合萃取剂的表观电离常数。导出了表观电离常数与混合溶剂中有机组份含量所遵循的经验方程,由直线外推得到了螯合剂在纯水中的电离常数值。
Using a new mixed solvent system, the apparent ionization constants of three newly synthesized 4-acylpyrazolone chelating extractants were determined by pH potentiometric titration. The empirical equation followed by apparent ionization constant and organic component content in the mixed solvent was derived. The ionization constant of chelating agent in pure water was obtained by linear extrapolation.