Sensitive adsorptive stripping voltammetric method for determination of trace concentration of titanium in the presence of chloranilic acid as a complexing agent

摘要

This paper reports a new adsorptive voltammetric procedure of trace titanium determination using (Hg (Ag)FE) as a working electrode and chloranilic acid as a complexing agent. The reduction peak current of the complex was proportional to the concentration of Ti(IV) in the concentration range from 1 x 10(-8) mol L-1 to 5 x 10(-7) mol L-1. Parameters that affect the titanium response, including solution pH, chloranilic acid concentration, accumulation potential and accumulation time, were optimized. Under optimum conditions the detection limit was 3.5 x 10(-9) mol L-1 after 30 s accumulation time. Under optimized conditions the quantitative Ti(IV) determination in the presence of as little as 30 ppm of nonionic, 20 ppm of anionic and 10 ppm of cationic of surface active compounds, and 20 ppm of natural organic matter can be performed. The proposed method was validated in the course of studying the recovery of Ti(IV) from spiked natural water samples. (C) 2015 Elsevier B.V. All rights reserved.