摘要
在溴化十六烷基三甲基铵(CTMAB)存在下,Ti(Ⅳ)同甘露醇和邻苯三酚红在pH 3.4时形成蓝色的四元配合物,配合物的组成为:n(Ti(Ⅳ)):n(甘露醇):n(邻苯三酚红):n(CTMAB)=1:1:2:3,配合物的最大吸收波长为630 nm,Ti在0~1.40μg/mL范围内符合比耳定律,摩尔吸光系数为3.1×10^5L·mol^-1·cm^-1.用抗坏血酸掩蔽Fe(Ⅲ),体系不需要分离可直接用于钢中微量钛的测定.
In the presence of CTMAB, Ti ( IV ) can form a blue complex with mannite and pymgallol red (PR) at pH 3.4, the composition ratio of Ti( Ⅳ )/mannite/PR/CTMAB is 1:1:2:3. The complex exhibits maximum absorption at 630 nm, Beer's law is obeyed for 0 - 35μg/25 mL of Ti( Ⅳ ), and the molar absorptivity is 3.1 × 10^5 L·mol·cm. Using ascorbic acid as a masking reagent of Fe ( Ⅲ ), the system can be applied to the determination of Ti in steels without preseparation.
出处
《分析试验室》
CAS
CSCD
北大核心
2006年第6期70-72,共3页
Chinese Journal of Analysis Laboratory