TY - JOUR
T1 - High sensitivity adsorptive stripping voltammetric method for antimony(III) determination in the presence of quercetin-5′-sulfonic acid. Substituent effect on sensitivity
AU - Rojas, Carlos
AU - Arancibia, Verónica
AU - Gómez, Marisol
AU - Nagles, Edgar
PY - 2013/6/24
Y1 - 2013/6/24
N2 - 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-1and 1.6 ng L-1with tadsof 60 s and 180 s, respectively. Peak current is proportional to Sb(III) concentration up to 10.0 μg L-1and 1.5 μg L-1with tadsof 60 s and 180 s, respectively. The relative standard deviation were 1.7% and 2.5% for a solution containing 1.0 μg L-1and 5.0 μg L-1of 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. © 2013 The Authors.
AB - 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-1and 1.6 ng L-1with tadsof 60 s and 180 s, respectively. Peak current is proportional to Sb(III) concentration up to 10.0 μg L-1and 1.5 μg L-1with tadsof 60 s and 180 s, respectively. The relative standard deviation were 1.7% and 2.5% for a solution containing 1.0 μg L-1and 5.0 μg L-1of 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. © 2013 The Authors.
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U2 - 10.1016/j.snb.2013.05.058
DO - 10.1016/j.snb.2013.05.058
M3 - Article
SP - 560
EP - 567
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
SN - 0925-4005
ER -