Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/100849
Type: Artigo de periódico
Title: Multi-electrode Detection In Voltammetry. Part 3. Effects Of Array Configuration On The Hadamard Multiplexed Voltammetric Technique
Author: Freire R.S.
Rohwedder J.J.R.
Pasquini C.
Abstract: The effect of the number of electrodes and their relative distribution on the gain of the signal-to-noise ratio (SNR) in a multiplexed voltammetric measurement was evaluated. A voltammetric multi-channel instrument was constructed capable of operating with up to 63 ultramicroelectrodes (mercury coated copper discs, diameter 55 μm). The gain in the SNR was investigated as a function of the number of electrodes (15, 31 and 63) in the array. For each array a design matrix was employed for the multiplexed measurements. The results show that the detection limit for Pb(II) can be improved 5.1-fold by employing 63 electrodes. The overlapping effect of diffusion layers was also evaluated and the results allow the conclusion that, for multiplexed readings obtained at 100 per second, and when the distance between adjacent electrodes is less than 20 times their diameter, the radial component is disturbed, causing a reduction in the faradaic current. On the other hand, by keeping the distance greater than this limit, the multiplex gain can be fully achieved with a substantial reduction in data acquisition time.
Editor: 
Rights: aberto
Identifier DOI: 10.1039/a904670d
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0032721288&partnerID=40&md5=11f8a3f175ab8fbdee3b8c78c9dcd1ce
Date Issue: 1999
Appears in Collections:Unicamp - Artigos e Outros Documentos

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