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本文在25±0.1℃,表观离子强度0.1(KNO_3)条件下,用pH电位法测定了五种正烷基亚氨二乙酸(C_nH_(2n+1)N(CH_2COOH)_2,n=6,8,10,12,14)在混合溶剂中及水溶液中与Cu~(2+)形成的络合物的生成常数。结果表明:在硅孔雀石和黑钨矿的浮选中,当捕收剂C_nH_(2n+1)N(CH_2COOH)_2的n小于12时,其捕收能力大幅度下降的原因不在络合能力的衰减,而在水溶性等方面的差异;正烷基亚氨二乙酸与金属离子络合物的生成常数在混合溶剂(75vol％二氧已环、25vol％水)中比水溶液中增加的值与该金属离子的外层电子构型,广义软硬酸碱度等因素有关。
In this paper, the five n-alkyliminodiacetic acids (C_nH 2n + 1) N (CH 2 COOH) 2, n = 6 were measured by pH potentiometry at 25 ± 0.1 ℃ and apparent ionic strength of 0.1 8, 10, 12, 14) The formation constants of complexes with Cu ~ (2+) in a mixed solvent and in an aqueous solution. The results show that when n of C_nH_ (2n + 1) N (CH_2COOH) _2 is less than 12, the reason why the catching ability of C_nH_ (2n + 1) N (CH_2COOH) Decay, and the difference in water solubility; the value of the increase constant of the formation constant of n-alkyliminodiacetate and the metal ion complex in the mixed solvent (75 vol% dioxane, 25 vol% water) The outer layer of the metal ion electronic configuration, generalized hard and soft pH and other factors.