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Open AccessArticle

Development and Optimization of an Airborne Formaldehyde Microfluidic Analytical Device Based on Passive Uptake through a Microporous Tube

1
Université de Strasbourg, CNRS, ICPEES UMR 7515, F-67000 Strasbourg, France
2
In’Air Solutions, 25 rue Becquerel 67087 Strasbourg, France
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(12), 807; https://doi.org/10.3390/mi10120807
Received: 4 October 2019 / Revised: 13 November 2019 / Accepted: 21 November 2019 / Published: 23 November 2019
(This article belongs to the Special Issue Optimization of Microfluidic Devices)
This paper describes a compact microfluidic analytical device developed for the detection of low airborne formaldehyde concentrations. This microdevice was based on a three-step analysis, i.e., the passive gaseous formaldehyde uptake using a microporous membrane into an acetylacetone solution, the derivatization with acetylacetone to form 3,5-diacetyl-1,4-dihydrolutidine, and the quantification of the latter using fluorescence detection. For a rapid and easier implementation, a cylindrical geometry of the microporous element was considered to perform laboratory-controlled experiments with known formaldehyde concentrations and to establish the proof of concept. This work reports the evaluation of the uptake performance according to the microporous tube length, the liquid flow rate inside the tube, the gas flow rate outside the tube, and the gaseous formaldehyde concentration. A 10.0 cm microporous tube combined with a gas flow rate of 250 NmL/min (normal milliliters per minute) and a liquid flow rate of 17 µL/min were found to be the optimized conditions. In these experimental conditions, the fluorescence signal increased linearly with the gaseous formaldehyde concentration in the range 0–118 µg/m3, with the detection limit being estimated as 0.13 µg/m3 when considering a signal-to-noise ratio of 3. View Full-Text
Keywords: microdevice; formaldehyde; microfluidics; microporous membrane; indoor air; passive sampling microdevice; formaldehyde; microfluidics; microporous membrane; indoor air; passive sampling
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MDPI and ACS Style

Becker, A.; Andrikopoulou, C.; Bernhardt, P.; Ocampo-Torres, R.; Trocquet, C.; Le Calvé, S. Development and Optimization of an Airborne Formaldehyde Microfluidic Analytical Device Based on Passive Uptake through a Microporous Tube. Micromachines 2019, 10, 807.

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