title: A novel, low-cost, high performance dissolved methane sensor for aqueous environments.
abstract: 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 (3 sigma, and t90 approxiamtely 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.
authors: National Oceanography Centre, Southampton, Waterfront Campus, European Way, SO14 3ZH Southampton, UK. cbo@noc.soton.ac.uk
authors: Cédric
authors: C
authors: Boulart
authors: Matthew C
authors: MC
authors: Mowlem
authors: Douglas P
authors: DP
authors: Connelly
authors: Jean-Pierre
authors: JP
authors: Dutasta
authors: Christopher R
authors: CR
authors: German
mesh_terms: D004129:Dimethylpolysiloxanes / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D046911:Macromolecular Substances / Q000737:chemistry*; D008697:Methane / Q000032:analysis* / Q000737:chemistry*; D009757:Nylons / Q000737:chemistry; D010865:Pilot Projects; D011083:Polycyclic Compounds; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers; D014230:Triazoles / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D004129:Dimethylpolysiloxanes; D046911:Macromolecular Substances; D009757:Nylons; D011083:Polycyclic Compounds; D014230:Triazoles; C523242:cryptophane; C085707:poly(dimethylsiloxane)-polyamide copolymer; D014867:Water; D008697:Methane