Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/81448
Type: Artigo de periódico
Title: Portable flow-injection analyzer with liquid-core waveguide based fluorescence, luminescence, and long path length absorbance detector
Author: Li, QY
Morris, KJ
Dasgupta, PK
Raimundo, IM
Temkin, H
Abstract: We describe a multifunctional flow analysis instrument that is portable (25 cm x 20 cm x 11 cm, 2.3 kg) for facile field deployment. Using a 50 cm long Teflon((R)) AF tubing as final reaction and optical measurement conduit, we combine a liquid-core waveguide (LCW) based fluorescence detector that is transversely illuminated by an addressable light emitting diode array, a chemiluminescence (CL) detector and an absorbance detector with a solid-state broadband (400-700 nm) source. Several illustrative experiments have been carried out to test the performance of the instrument in different detection modes. A S/N = 3 limit of detection (LOD) of 0.25 mug 1(-1) for chromium(VI) was established using the diphenylcarbazide chemistry, and an LOD of 5 mug 1(-1) was similarly established for Al(III), using Pyrocatechol Violet (PCV) as the chelating chromogenic dye, in both cases using long path absorption detection. The LOD for aqueous hydrogen peroxide was 16 nM using a fluorescence method based on the formation of thiochrome from thiamine and 4 nM by a luminol chemiluminescence method. With a Nafion membrane diffusion scrubber (DS), the LOD was 8.0 pptv for gaseous hydrogen peroxide by the fluorescence method. (C) 2002 Elsevier Science B.V. All rights reserved.
Subject: liquid-core waveguide
long path length absorbance
hydrogen peroxide
multipurpose LED-based absorbance/fluorescence
detector
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S0003-2670(02)01531-3
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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