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报道了采用氯磺酚 S(SCPS) -示波计时电位法在 p H=5 .0下分别直接检测天然水中的无机单核铝Ali 和总单核铝 Ala浓度 .并用该法测定了有机单核铝 Alo,总铝 Al T和酸溶态铝 Alr,从而实现了天然水中 5种 Al形态的电化学测定 .测定了 2 0个实际水样 ,与 Driscoll方法进行了对照 ,结果基本一致 .用热力学平衡计算探讨了该试剂与 Al的络合机理 ,通过与其它试剂进行比较 ,总结出试剂的酸离解常数 Ka、稳定络合常数K稳 以及配体结构对测定 Al形态结果的影响规律
Reported the direct determination of the concentrations of inorganic mononuclear aluminum (Ala) and total monomeric aluminum (Ala) in natural water at pH 7.5 using SCS-oscillometric chronopotentiometry, Aluminum Allo, Al T and acid aluminum Alr, so as to realize the electrochemical determination of five Al species in natural water.After 20 real water samples were measured and compared with Driscoll method, the results were basically the same. The mechanism of the complexation of the reagent with Al was discussed by thermodynamic equilibrium calculation. The acid dissociation constant Ka, stable complexation constant K, and the influence of the ligand structure on the determination of Al morphology were summarized by comparison with other reagents