Projects per year
Abstract
A microfluidic lab-on-chip derivatisation technique has been optimized to achieve a rapid, automated and sensitive determination of ambient gaseous formaldehyde when used in combination with GC-MS. The method used a Pyrex micro-reactor comprising three inlets and one outlet, gas and fluid splitting and combining channels, mixing junctions, and a 2.0 m long, 620 mm internal diameter reaction micro-channel. The micro-reactor integrated three functions, that of: (1) mixer and reactor, (2) heater, and (3) preconcentrator. The flow rates of the gas sample and derivatisation solution and the temperature of the micro-reactor were optimized to achieve a near real-time measurement with a rapid and high efficiency derivatisation step following gas sampling. The enhanced phase contact area-to-volume ratio and the high heat transfer rate in the micro-reactor resulted in a fast and high efficiency derivatisation reaction. Calibration showed good linearity in the range of 26 to 331 ppb with correlation coefficients R-2 = 0.988 and 0.997 for PFPH and PFBHA derivatives. For low gas phase formaldehyde mixing ratios (
Original language | English |
---|---|
Pages (from-to) | 2013-2020 |
Journal | Analytical methods |
Volume | 4 |
Issue number | 7 |
DOIs | |
Publication status | Published - 1 Jul 2012 |
Projects
- 1 Finished
-
Technology towards a lab-on-a-chip GC for environmental research
NATURAL ENVIRONMENT RESEARCH COUNCIL
12/05/08 → 20/06/14
Project: Research project (funded) › Research