Adsorptive anodic stripping voltammetric determination of antimony(III) on a glassy carbon electrode using rivastigmine as a new chemical receptor

A very simple and sensitive adsorptive anodic stripping voltammetric method was developed for determination of antimony(III) on a glassy carbon electrode (GCE), using rivastigmine (RIV) as the chemical receptor. No study on the usage of antimony(III) for metal determination as a modifier/complexing agent/chemical receptor was found in the literature review. The proposed method is based on the accumulation of the Sb-RIV complex on GCE under stirring conditions using optimized accumulation potential and time following the recording of a differential pulse (DP) voltammogram in anodic direction. The calibration graph consisted of two linear segments of 5.0 x 10(-4)-0.5 mu M (i(p)(mu A) = 7.45C(Sb(III)) (mu M) + 0.05, R-2 = 0.9974) and 0.5-2.5 mu M (i(p)(mu A) = 10.45C(Sb(III)) (mu M) - 0.76, R-2 = 0.9959) with a detection limit of 7.1 x 10(-11) mol L-1. The RSD (n = 5, intra-day) for 1.0 x 10(-6) mol L-1 Sb(III) and 5.0 x 10(-7) mol L-1 Sb(III) were calculated as 1.53% and 2.62%, respectively. Inter-day precision (n = 5) was also calculated as 2.16% for 1.0 x 10(-6) mol L-1 Sb(III), indicating that the proposed method has good precision. The spiked water sample analyses were evaluated using the described method and a good recovery of Sb(III) was obtained with results in the range from 95.0% to 97.6%. (C) 2014 Elsevier B.V. All rights reserved.