Voltammetric Determination of Zn2+ in Antiseptic Dusting Powder and Multivitamins Using a Carbon Paste Electrode Modified with Bi Anchored on Amberlite® IR120

Abstract

This work presents a voltammetric method for Zn 2+ determination in antiseptic dusting powder and multivitamin commercial samples, combining an alkaline extraction using NaOH aqueous solution with a carbon paste electrode chemically modified with Bi anchored on Amberlite ® IR120 ion exchange resin (CPEAmb/Bi). The best conditions for electrode preparation were: 10% (m/m) of Amberlite ® IR 120; 30 s Bi 3+ accumulation time (open circuit) in 0.5 mmol L-1 Bi 3+ solution prepared in 0.1 mol L-1 acetate buffer (pH = 5.5). The analytical curve for Zn 2+ using the CPEAmb/Bi presented linear range from 0.05 to 8.2 μmol L-1 and the limit of detection was 10 nmol L-1. The voltammetric method was simple, fast, efficient and low-cost for the Zn 2+ determination in antiseptic dusting powder and multivitamin samples.

Uncured Polydimethylsiloxane as Binder Agent for Carbon Paste Electrodes: Application to the Quantification of Propranolol

“…Therefore, this composition was used in all the subsequent experiments. This result agrees with the literature, 6,34,35,54,55 which reports that CPEs with binder contents of 20-30% (m/m) are the most appropriate for electroanalytical applications. SEM images for PDMS and Nujol ® -CPEs are presented in Figure 2.…”

“…The limit of detection (LOD) and the limit of quantification (LOQ) were estimated from the equations: LOD = 3 sd/b and LOQ = 10 sd/b, where b is the slope of the analytical curve and sd is the standard deviation for the signal of blank, which was estimated from the error of the intercept of the analytical curve. 6 For PDMS-CPE it was obtained LOD = 3 μmol L -1 and LOQ = 10 μmol L -1 , and Nujol ® -CPE provided LOD = 8 μmol L -1 and LOQ = 27 μmol L -1 . From Figure 8, it can be observed that the precision of the i p values obtained with the PDMS-CPE was superior to Nujol ® -CPE, which can be visualized by the larger error bars presented by Nujol ® -CPE.…”

“…A chemically modified CPE is obtained by the simple addition of the chemical modifier to the mixture between graphite powder and the binder agent. Several chemical modifiers have been used such as ion exchange materials, 6,7 silica, and organofunctionalized silicas, [8][9][10][11] metallic nanoparticles, 12,13 oxides 14 and complexes, 15,16 carbon nanotubes, 17 etc. These materials have allowed the preparation of CPEs with superior analytical performance extending their application to trace analysis of different kinds of analytes, such as metal ions, 18,19 drugs, 20,21 organic pollutants, 22 and biologically important compounds.…”