对碘偶氮氯膦光度法测定钛（Ⅳ）的研究和应用  

A Study on the photometric determina-tion of titanium(Ⅳ)with p-iodochlorophosphonazo and its application

作　　者：王曙[1] 杨敏思[1] 刘期凤 

机构地区：[1]四川轻化工学院

出　　处：《分析试验室》1995年第6期38-40,共3页Chinese Journal of Analysis Laboratory

摘　　要：本文研究了钛（Ⅳ）和对碘偶氮氯膦的显色反应。试验表明：在ｐＨ３．０～４．８的ＨＡｃ－ＮａＡｃ缓冲体系中，钛（Ⅳ）和显色剂形成１：１的蓝绿色配合物。试剂的吸收峰位于５６４ｎｍ，配合物吸收峰在６９６ｎｍ，其表现摩尔吸光系数ε＿（６９６）＝１．６９×１０￣４Ｌ，ｍｏｌ￣（－１）．ｃｍ￣（－１）。钛（Ⅳ）量在０～１４μｇ／１０ｍＬ范围内符合比尔定律。许多常见离子一定量存在不干扰测定。大量Ｆｅ￣（３＋），Ａｌ￣（３＋）的干扰可经沉淀及静态阴离子交换分离和加抗坏血酸消除。测定了铝土矿和水系沉积物中的钛（Ⅳ），结果令人满意。The colour reaction of Ti(Ⅳ)with p-iodochlorophosphonazo ( CPA-PI)has beenstudied.It is shown that the blue-greencomplex is formed in pH4. 0 HAc-NaAcmedium and the composition ratio of titani-um to CPA-PI is 1:1.The maximum ab-sorption of the complex is at 685nm and theapparent molar absorptivity is 1.59 ×10￣4 L.mol￣(-1). cm￣(-1);Beer’s law is obeyed for Ti(Ⅳ)in the range of 0～14μg/10mL. The in-terferences and their limination are studied.This method has been applied to the determination of Ti(Ⅳ)in bauxite and drainagesediment.The result is satisfactory.

关 键 词：对碘偶氨氯膦 光度法 钛 铝土矿 

分 类 号：O614.411[理学—无机化学] O657.32[理学—化学]