Determination of volatile sulfur compounds in the atmosphere and surface seawater in Qingdao

A method to determine the volatile sulfur compounds in the atmosphere and the surface seawater by pre-concentration and GC-FPD is established. The coveries of COS, DMS and CS_2 in gas samples are (95±4)%, (86±3)% and (91±6)% (n=5), respectively, and (86±8)%, (80±6)% and (97±12)% (n=5) in water samples. The precisions of COS, DMS and CS_2 are 4.75%,8.26% and 7.55% (n=5)in gaseous samples and 8.17%, 5.59% and 11.70% in water samples, respectively. The detection limits of COS, DMS and CS_2 are 33pg,387pg and 22pg, respectively. COS, DMS and CS_2 in the atmosphere and the surface seawater in Qingdao are measured with this method. It is observed that COS is the most abundant volatile sulfur compound in the atmosphere, while DMS is the most abundant in surface seawater. The concentrations of these three sulfur compounds show the evident seasonal variations with much greater values in summer than in winter.