A Comparative Study of 8‐Hydroxyquinoline and 8‐Hydroxyquinoline‐5‐sulfonic Acid for Antimony(III) Determination by AdSV. Substituent Effect on Sensitivity II |
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| Authors: | Carlos Rojas‐Romo Verónica Arancibia |
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| Affiliation: | Pontificia Universidad Católica de Chile, Facultad de Química, Vicu?a Mackenna 4860, Santiago?7820436, Chile |
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| Abstract: | A sensitive and selective method for the determination of Sb3+ based on the formation of its complexes with 8‐hydroxyquinoline (HQ) and 8‐hydroxyquinoline‐5‐sulfonic acid (HQS) is proposed. The best analytical conditions are: pH 5.4 and 2.2 for HQ and HQS, respectively; CHQ from 15.0 to 25.0 µmol L?1 and CHQS from 70.0 to 200.0 µmol L?1. The detection limits are 100.0 and 14.0 ng L?1 (tacc=30 s) for Sb3+ with HQ and HQS, respectively. The method using HQS as ligand has a 2.2‐fold higher sensitivity than that with HQ and the former was chosen for Sb3+ determination. |
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| Keywords: | Antimony 8‐Hydroxyquinoline‐5‐sulfonic acid 8‐Hydroxyquinoline Adsorptive stripping voltammetry |
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