Referenced in: none

Automatically associated channels: Kv10.1

Title: Development and optimization of a lab-on-a-chip device for the measurement of trace nitrogen dioxide gas in the atmosphere.

Authors: Yoshimasa Takabayashi, Michihisa Uemoto, Kenjiro Aoki, Tamao Odake, Takashi Korenaga

Journal, date & volume: , 2006 Apr , 131, 573-8

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/16568175

Abstract
We propose the use of lab-on-a-chip technology for measuring gaseous chemical pollutants, and describe the development of a microchip for the detection of nitrogen dioxide (NO2) in air. A microchip fabricated from quartz glass has been developed for handling the following three functions, gas absorption, chemical reaction and fluorescence detection. Channels constructed in the microchip were covered with porous glass plates, allowing nitrogen dioxide to penetrate into the triethanolamine (TEA) flowing within the microchannel beneath. The nitrogen dioxide was then mixed with TEA and reacted with a suitable fluorescence reagent in the chemical reaction chamber in the microchip. The reacted solution was then allowed to flow into the fluorescence detection area to be excited by an ultraviolet light-emitting diode (UV-LED), and the fluorescence was detected using a photomultiplier tube (PMT). The reaction time, reagent concentration, pH, flow rate and other measurement conditions were optimised for analysis of nitrogen dioxide in air. Preliminary studies with standardized test solutions revealed quantitative measurements of nitrite ion (NO2-), which corresponded to atmospheric nitrogen dioxide in the range of 10-80 ppbv.