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Type: Artigo de periódico
Title: Construction and evaluation of a flow injection micro-analyser based on urethane-acrylate resin
Author: Fonseca, A
Raimundo, IM
Rokwedder, JJR
Ferreira, LOS
Abstract: A flow injection micro-analyser with an integrated injection device and photometric detection is described. Channels measuring 205-295 mu m depth by 265-290 mu m maximum width were manufactured by deep UV lithography on two layers of urethane-acrylate oligomers-based photoresist. Hypodermic syringe needles (450 mu m diameter) were connected to the channels for introduction of solutions into the system. Plastic optical fibres were connected to the ends of a 5.0 mm long channel, in order to conduct the light from and to a homemade photometer. The device has a total volume of 7.0 mu L and three different sample volumes (0.09, 0.22 and 0.30 mu L) can be inserted into the system by choosing the appropriate loop of the hydrodynamic injection approach. The micro-analyser, designed as a single line manifold, was evaluated by determining chloride in waters (mercuric thiocyanate method), and chromium (VI) in wastewater and total chromium in metallic alloys (diphenyl-carbazide method). For chloride determination two micro-pumps were employed to impel the solutions, while for chromium determination this task was performed by a conventional peristaltic pump. The results obtained in all determinations did not differ significantly from the reference methods at a confidence level of 95%. In the chloride determination, a flow rate of 50 mu L min(-1) was used, providing a sample frequency of 45 injection h(-1), generating ca. 0.7 mg of Hg(II) after an 8-h working day (ca. 20 mL of solution). This result suggests the potential of the micro-analyser towards the reduction of waste, following the philosophy of Green Chemistry. (c) 2007 Elsevier B.V. All rights reserved.
Subject: micro-FIA
microfluidic devices
flow analysis
deep ultraviolet lithography
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.aca.2007.09.051
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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