PBTCA与铜、锌、镉、镍离子间的配位化学研究

Study on the coordination chemistry of PBTCA with divalent cations (Cu,Zn,Cd,Ni)in aqueous solution

采用电位滴定方法 ,运用先进的配位常数计算程序 ,通过恰当配位化学模型的建立 ,研究了水溶液中 2-膦基丁烷 - 1,2 ,4 -三羧酸 (PBTCA)自身的解离以及与Cu2 + 、Zn2 + 、Cd2 + 、Ni2 + 离子间的配位化学作用 ,测定了相应的解离常数和配合物稳定常数 ,并得到了各配合物物种在不同 pH值条件下的形态分布 。

By means of acid base potentiometric titration and the BEST computer program developed by A.E. Martell, et al ,the dissociation constants of 2-phosphino-butane-1,2,4-tricaboxylic acid(PBTCA) and the stability constants of its complexes with four divalent cations (Cu,Zn,Cd,Ni) have been studied. According to the experimental and computing results,the distribution curves of the coordinating species in aqueous solution at different pH are gained out. The possible effect of PBTCA on the inhibition of the above scale forming divalent cations has been discussed.