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Type: Artigo de periódico
Title: Multi-electrode detection in voltammetry Part 2. Evaluation of a Hadamard multiplexed voltammetric technique
Author: Rohwedder, JJR
Pasquini, C
Abstract: A multiplex approach has been evaluated:to obtain individual voltammetric signals coming from an array of independent microelectrodes. The multiplex design employs S matrices and the Hadamard-transform to recover the signals for each electrode. Two pulse like voltammetric techniques, resembling the conventional normal pulse and differential pulse techniques, have been employed to generate: the multiplexed currents.-An array of 31 microelectrodes has been employed and the signal-to-noise ratio (SN obtained for the measurements presented a gain that is close to:the 2.78 value predicted by the multiplex design. However; the reduction in the time-interval spent for data acquisition was not 16, as predicted but 3 times. The increase in the data acquisition time for the multiplexed reading is a consequence of the pulse techniques employed. These techniques Cause depletion of the electroactive specimen near the electrode surface. To overcome this problem a resting potential of 100 ms and a false multiplexed pre-scan, must be employed. The gain in the S/N obtained allows fdr a three times enhancement in the detection limit for Pb-II determination when compared to the same non-multiplexed technique.
Country: Inglaterra
Editor: Royal Soc Chemistry
Rights: aberto
Identifier DOI: 10.1039/a801102h
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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