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Sensors 2005, 5(4), 284-292; doi:10.3390/s5040284
Article

Determination of Trace Antimony (III) by Adsorption Voltammetry at Carbon Paste Electrode

1,* , 3, 1, 2 and 2,*
1 Department of Chemistry, Shaoguan University, Shaoguan, 512005, China 2 State Key Laboratory of Bioelectronics (Chien-Shiung Wu Laboratory), Southeast University, Nanjing 210096, China 3 Department of Chemistry, Xiangtan University, Xiangtan, 411105, China
* Authors to whom correspondence should be addressed.
Received: 12 July 2004 / Accepted: 2 May 2005 / Published: 4 May 2005
(This article belongs to the Special Issue Papers presented at I3S2004, Nanjing)
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Abstract

This work presents a sensitive method for the determination of trace antimonybased on the antimony-pyrogallol red (PGR) adsorption at a carbon paste electrode (CPE).The optimal conditions were to use an electrode containing 25% paraffin oil and 75%high purity graphite powder as working electrode, a 0.10 mol/L HCl solution containing3.0×10-5 mol/L PGR as accumulation medium and a 0.20 mol/L HCl solution aselectrolyte with an accumulation time of 150 s and a reduction time of 60 s at -0.50 Vfollowed with a sweep from -0.50 V to 0.20 V. The mechanism of the electrode reactionwas discussed. Interferences of other metal ions were studied as well. The detection limitwas 1×10-9 mol/L. The linear range was from 2.0×10-9 mol/L to 5.0×10-7 mol/L.Application of the proposed method to the determination of antimony in water andhuman hair samples gave good results.
Keywords: antimony; pyrogallol red; carbon paste electrode; adsorptive voltammetry. antimony; pyrogallol red; carbon paste electrode; adsorptive voltammetry.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Guo, H.; Li, Y.; Chen, X.; Nie, L.; He, N. Determination of Trace Antimony (III) by Adsorption Voltammetry at Carbon Paste Electrode. Sensors 2005, 5, 284-292.

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