A micro-extractor for concentration and determination of lead in water

In this work, we present the design, fabrication and characterization of a novel micro-extractor that performs on-line extraction–concentration–detection (ECD) of target molecules flowing in a carrier liquid. The system comprises a primary microchannel containing a flowing aqueous carrier liquid and...

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Bibliographic Details
Published in:Advances in natural sciences. Nanoscience and nanotechnology 2011-03, Vol.2 (1), p.015013-1-6
Main Authors: Van Man, Tran, Berthier, Jean, Ozil, Patrick, Sarrut, Nicolas
Format: Article
Language:English
Subjects:
Carriers
Design engineering
Extraction
Fluid dynamics
Fluid flow
Fluids
Liquids
Nanostructure
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Summary:In this work, we present the design, fabrication and characterization of a novel micro-extractor that performs on-line extraction–concentration–detection (ECD) of target molecules flowing in a carrier liquid. The system comprises a primary microchannel containing a flowing aqueous carrier liquid and a secondary organic storage fluid circulating in an adjacent channel. The interfaces between the two immiscible fluids are stabilized by vertical micro-pillars. The system encompasses three functions: (i) extraction of the target molecules from the carrier fluid through the pillar-stabilized interfaces, (ii) concentration of the targets in the secondary organic solvent due to its very low—or zero—velocity and (iii) on-line detection via optical spectrometry. We successively present the analysis of the physics of the system, which has led us to a specific design, then the microfabrication of the chip, and finally we demonstrate the extraction, concentration and detection of lead ions ( Pb 2+ ) from a water flow.
ISSN:2043-6262
2043-6254
2043-6262
DOI:10.1088/2043-6262/2/1/015013