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本文改进了前人用于测定低分子量配体及可溶性聚电解质配体络合物的生成常数的电位滴定法,以使适用于作为固体络合剂的螯合离子交换树脂和羧酸型弱酸性离子交换树脂的络合物。测得具有亚胺二乙酸功能基的大孔螫合树脂D751和具有羧酸功能基的大孔丙烯酸系树脂D725与Cu、Ni、Co、Zn的络合物的二级积累生成常数B_2。D751树脂的B_2介于5×10~(-4)至4×10~(-7)之间,D725树脂的B_2介于7×10~(-9)至4×10~(-10)之间。
In this paper, the potentiometric titration method used to determine the formation constants of low molecular weight ligands and soluble polyelectrolyte ligand complexes has been modified so that the chelating ion exchange resins suitable for use as solid complexing agents and the carboxylic acid type weak acidity Ion exchange resin complex. The secondary accumulation constant B2 of macroporous resin D751 with imide diacetic acid functional group and macroporous acrylic resin D725 with carboxylic acid functional group and Cu, Ni, Co, Zn was measured. B 2 of D751 resin ranged from 5 × 10 -4 to 4 × 10 -7 and B 2 of D 725 resin ranged from 7 × 10 -9 to 4 × 10 -10 between.