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A novel, low-cost, high performance dissolved methane sensor for aqueous environments

Boulart, Cédric; Mowlem, Matthew C.; Connelly, Douglas P.; Dutasta, Jean-Pierre; German, Christopher R.. 2008 A novel, low-cost, high performance dissolved methane sensor for aqueous environments. Optics Express, 16 (17). 12607-12617. 10.1364/OE.16.012607

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Abstract/Summary

A new method for in-situ detection and measurement of dissolved methane in aqueous media/environments with a limit of detection of 0.2 nM (3σ, and t90~110s) and range (1-300 nM) is presented. The detection method is based on refractive index (RI) modulation of a modified PolyDiMethylSiloxane (PDMS) layer incorporating molecules of cryptophane-A [1] which have a selective and reversible affinity for methane [2]. The refractive index is accurately determined using surface plasmon resonance (SPR) [3]. A prototype sensor has been repeatedly tested, using a dissolved gas calibration system under a range of temperature and salinity regimes. Laboratory-based results show that the technique is specific, sensitive, and reversible. The method is suitable for miniaturization and incorporation into in situ sensor technology.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1364/OE.16.012607
ISSN: 1094-4087
Date made live: 14 Oct 2008 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/163485

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