High sensitivity adsorptive stripping voltammetric method for antimony(III) determination in the presence of quercetin-5′-sulfonic acid. Substituent effect on sensitivity

Carlos Rojas, Verónica Arancibia, Marisol Gómez, Edgar Nagles

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24 Scopus citations

Abstract

A high sensitivity method for voltammetric determination of Sb(III) using quercetin-5′-sulfonic acid (QSA) as complexing and adsorbing agent is presented. The Sb-QSA is accumulated on the electrode surface and then reduced at about -0.67 V. Optimal analytical conditions were pH: 5.5, CQSA: 3.0 μmol L-1, Eads: -0.10 V and tads: 60 s. The detection limit (3σ) depends on accumulation time, reaching 3.6 ng L-1 and 1.6 ng L-1 with tads of 60 s and 180 s, respectively. Peak current is proportional to Sb(III) concentration up to 10.0 μg L-1 and 1.5 μg L-1 with tads of 60 s and 180 s, respectively. The relative standard deviation were 1.7% and 2.5% for a solution containing 1.0 μg L-1 and 5.0 μg L-1 of Sb(III), respectively (n = 10). Interference by other metal ions was studied. The proposed method was applied to the determination of antimony in natural and spiked water samples, with satisfactory results. The method was designed in order to compare the sensitivity of the methods that use quercetin and the sulfonic derivative.

Original languageEnglish
Pages (from-to)560-567
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume185
DOIs
StatePublished - 2013

Bibliographical note

Funding Information:
Financial support by FONDECYT under Regular Project No. 1130081 and CONICYT by doctoral fellowship (No. 21120190 . Carlos Rojas) are gratefully acknowledged.

Keywords

  • Adsorptive stripping voltammetry
  • Antimony
  • Quercetin-5′-sulfonic acid

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