HR: 0800h
AN: OS11B-0507    [Abstracts]
TI: Determination of Trace Aldehydes and Ketones in Seawater Using a Derivatization-Solid- Phase Microextraction (SPME) Method
AU: * Hudson, E D
EM: edward.hudson@mail.mcgill.ca
AF: Department of Chemistry, McGill University, Otto Maass Building 801 Sherbrooke St. West, Montreal, QC H3A 2K6, Canada
AU: Ariya, P A
EM: parisa.ariya@mcgill.ca
AF: Department of Chemistry, McGill University, Otto Maass Building 801 Sherbrooke St. West, Montreal, QC H3A 2K6, Canada
AU: Ariya, P A
EM: parisa.ariya@mcgill.ca
AF: Department of Atmospheric and Oceanic Sciences, McGill University, Burnside Hall 805 Sherbrooke St. West, Montreal, QC H3A 2K6, Canada
AB: Volatile aldehydes and ketones are thought to originate from the photochemistry of dissolved organic matter (DOM) in surface ocean waters. They are of interest both because they represent a sink of a portion of marine DOM and because, after transfer across the sea-air interface, they may affect oxidative processes in the marine troposphere, including the tropospheric HO_x budget. Therefore, facile, low-cost methods to determine their typical concentrations in seawater are needed. We here present a method based on derivatization of these carbonyl compounds to their pentafluorobenzyl oximes followed by solid phase microextraction (SPME) method. The method allows the facile, low-cost, portable, direct characterization of C₁ - C₉ carbonyl compounds in seawater with sub-nanomolar detection limits, and its optimization and application to surface seawaters from selected locations is presented.
DE: 4803 Analytical chemistry
DE: 4850 Marine organic chemistry (0470, 1050)
DE: 4894 Instruments, sensors, and techniques
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting