摘要
在溴化十六烷基三甲基铵(CTMAB)存在下,Ti(Ⅳ)同抗坏血酸(AA)或三乙醇胺(TEA)和邻苯二酚紫(PV)于pH_3时形成两种绿色的四元配合物。用等摩尔序列法和平衡移动法确定了配合物的组成:Ti(Ⅳ):AA(或TEA):PV:CTMAB=1:1:2:4。两种配合物均在735nm处有最大吸收。两体系的摩尔吸光系数均达1.0×10~5。络合形成反应具有较高的对比度,Δλ=295nm。Ti(Ⅳ)浓度在0.04到0.40ppm范围内服从比尔定律。考查了各种外来离子对测定Ti的影响。AA反应体系可不经预先分离而应用于某些钢铁中Ti的测定。
In the presence of cetyltrimethylammonium bromide (CTMAB) Ti (Ⅳ) can form two species of green quaternary complexes with ascorbic acid (AA) or triethanolamine (TEA) and pyrocatechol violet (PV) at pH3. By means of methods of equimolar series and equilibration shift the compositions of Ti (Ⅳ)/AA (or TEA)/PV/CTMAB are established fo be 1∶1∶2∶4. The two species of complexes exhibit maximum absorption at 735nm. The molar absorptivity of the two systems are found to be 1.0×10~5. The reactions of complex formation have higher contrast (Δλ=295nm). Beer's law is obeyed for 0.04 to 0.40ppm of Ti (Ⅳ), The complexes are stable for 24 h at least. The effects of diverse ions on the determination of Ti were examined. The system of AA may be applied to the determination of Ti in some steel products without previous separation.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1989年第6期520-523,共4页
Chinese Journal of Analytical Chemistry
关键词
钛
邻苯二酚紫
配合物
分光光度法
Titanium (Ⅳ)
Pyrocatechol violet
Spectrophotometry
