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

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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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) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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