Development of microfluidic analytical method for on-line gaseous Formaldehyde detection

SENSORS AND ACTUATORS B-CHEMICAL

卷:243

Article

Guglielmino, Maud^1,2  Allouch, Alaa^1,2  Serra, Christophe A.^2,3  Le Calve, Stephane¹ 

[1] UMR 7515 CNRS UdS, ICPEES, Grp Physicochim Atmosphere, 25 Rue Becquerel, F-67087 Strasbourg 02, France

[2] CNRS, Inst Charles Sadron, UPR 22, Grp Chim Macromol Precis CMP, 23 Rue Loess, F-67034 Strasbourg, France

[3] Univ Strasbourg, ECPM, 25 Rue Becquerel, F-67087 Strasbourg, France

关键词: Formaldehyde;    Microfluidics;    Annular flow;    Micro-device;    Indoor air;   

DOI  :  10.1016/j.snb.2016.11.093

来源: Elsevier

【 摘 要 】

This paper reports on the development of a novel colorimetric analytical method based on microfluidic technologies for the detection of low airborne Formaldehyde concentrations, representative of those found in indoor air, i.e. 10-100 mu gm(-3). The new analytical technique operates according to 4 distinct steps: 1) gas sampling, 2) gaseous Formaldehyde uptake into the aqueous solution using an annular gas/liquid flow at room temperature, 3) derivatization reaction with acetylacetone solution at 65 degrees C producing 3,5-Diacety1-1,4-dihydrolutidine (DDL) and 4) colorimetric DDL detection with a liquid-corewaveguide. Laboratory experiments were performed to determine the experimental conditions permitting to obtain a stable annular flow, i.e. a liquid flow rate above 5 mu Lmin(-1) and gas to liquid flow rate ratios greater than 1000. Effects of liquid-core-waveguide of internal diameter and length were also investigated. Using liquid and gas flow rates of 35 mu Lmin(-1) and 35 mLmin(-1) respectively, the resulting uptake yield of gaseous Formaldehyde in aqueous solution was around 90% and the detection limit of gaseous Formaldehyde was 0.7 gm(-3), which is consistent with the guideline values for indoor air. In addition, the low reagent consumption increases significantly the device autonomy up to 20 days with L-1 of acetylacetone solution. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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