US EPA

5093736 

Journal Article 

Microfluidic device for airborne BTEX detection 

Ueno, Y; Horiuchi, T; Morimoto, T; Niwa, O 

2001 

Yes 

Analytical Chemistry
ISSN: 0003-2700
EISSN: 1520-6882 

Analytical Chemistry 

73 

19 

4688-4693 

English 

11605848 

10.1021/ac010210+ 

WOS:000171356800027 

https://www.proquest.com/scholarly-journals/microfluidic-device-airborne-btex-detection/docview/217873925/se-2?accountid=171501
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We fabricated a microfluidic device for the optical detection of airborne benzene, toluene, ethylbenzene and xylenes (BTEX). The device consists of concentration and detection cells formed of 3 cm x 1 cm Pyrex plates. The concentration cell is composed of an adsorbent to concentrate the BTEX gases and a thin-film heater todesorb the concentrated gases from the adsorbent thermally. The collected gases are introduced into the detection cell, which is connected to optical fibers, to measure their absorption spectra. We optimized the device's operating conditions by studying the thermal characteristics of the concentration cell and the time profile of the gas concentration flowing in the detection cell. We used the device under optimized operating conditions to detect toluene gas as a typical example BTEX. The gas concentration amplification rate was approximately 2 orders of magnitude, and we successfully measured parts-per-million levels of toluene gas with this device. 

Chemistry--Analytical Chemistry; Chemistry; Instruments; Atmosphere; Measurement; Volatile organic compounds