铝铬天青S-氯化十六烷基吡啶三元配合物的形成机理研究

Study on the Formation Mechanism of Al-CAS-CPC Ternary Complex

以表面活性剂氯化十六烷基吡啶(CPC)作为增敏剂,研究Al-CAS-CPC体系的吸收光谱.通过直线法测得该三元配合物的组成比Al∶CAS∶CPC为1∶2∶4.根据铝和CAS在实验条件pH为6时的存在形态、配合物组成比,结合离子交换实验,确定配合物的组成结构,从而探讨Al-CAS-CPC三元配合物的形成机理.

Cetyl pyridinium chloride(CPC) was chosen as a sensitivity promoter of the color reaction of chrome azurol S(CAS) with aluminum.The absorption spectrum of Al-CAS-CPC was studied,and the molar ratio of 1∶2∶4(Al∶CAS∶CPC) for Al-CAS-CPC ternary complex was determined by straight-line method.The structure of the complex was defined according to the results of the ion-exchange experiment,the composition of the complex and the state of Al,CAS in solution with pH 6.