TITLE:
Simple and Rapid Spectrophotometric Determination of Titanium on Etched Aluminum Foils
AUTHORS:
Xianfeng Du, Youlong Xu, Li Qin, Xiangfei Lu, Qiong Liu, Yang Bai
KEYWORDS:
Titanium Oxide; Spectrophotometry; Hydrogen Peroxide; Etched Aluminum Foil
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.5 No.3,
February
17,
2014
ABSTRACT: Introduction of titanium oxides with high permittivity on etched
aluminum foils’ surface has been successfully utilized to increase specific
capacitance of anode foils for aluminum electrolytic capacitors. In order to
quantify the concentration of titanium (IV) on the etched aluminum foil
precisely, a simple and rapid spectrophotometric procedure has been developed.
After optimizing a series of variables including absorbance wavelength, concentration
of nitric acid, concentration of hydrogen peroxide, nitration time and
developing time, analytical precision and accuracy were tested by using
standard working solution containing known amount of titanium (IV). The results
showed that Lambert-Beer’s law was obeyed in the range of 0.01 to 3.00 mmol·L﹣1.
The relative standard deviation (RSD) ranged from 0.67% to 1.09% (n = 6), and the recovery was between 99.17% - 100.03%.
Investigation on effect of Al3+ ion indicated that there was no
interference in the absorbance of titanium (IV) at 410 nm. The proposed
procedure was applied to real samples for the determination of titanium (IV),
and the results were in a good agreement with the values certified by inductively coupled plasma-atomic emission spectrometry
(ICP-AES).