, Volume 78, Issue 3-4, pp 513-517
Date: 03 Feb 2004

Online monitoring of biogenic nitric oxide with a QC laser-based Faraday modulation technique

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Online sensing of nitric oxide traces based on a cw quantum cascade laser, operating near 5.2 μm, is reported. We utilized a Faraday modulation technique which provides unique selectivity since it exploits the magnetic moment of nitric oxide (NO) molecules. The minimum detectable NO concentration was found to be 4 ppb (sampling time: 10 s). Continuous monitoring of the NO release from nitrite solutions and human sweat samples is described. Detectable NO release rates are down to 10 pmol/s. We compare NO generation induced by a chemical, and by exposure to ultra-violet radiation.


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