Abstract
A method for determining the dimethyl sulfide (DMS) concentration in seawater by isotope dilution gas chromatography/mass spectrometry (GC/MS) is reported. A purge and trap technique was used to remove and preconcentrate DMS from aqueous solutions. Perdeuterated DMS (d 6-DMS), prepared as ethylene glycol solutions, served as an internal standard, resulting in a precision of better than 2% at 0.1 nM concentration. The standard solutions were titrated with Br 2 to determine the DMS concentration. The capability of this method for determination of true solution-phase DMS was demonstrated by extrapolating h 6-DMS/d 6-DMS signal ratios for serially extracted aqueous solutions to zero extraction volume, thereby determining accurate aqueous-phase DMS concentrations in the presence of DMS generated by rupture of algal cell walls and other precursors during sampling. DMS was determined in seawater samples collected from the North Atlantic Ocean between the eastern coast of the USA and Bermuda during spring 1988. Concentrations ranging from 1.26 to 3.95 nmol l −1 are reported.
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