title: [Distribution of dimethylsulfoxide (DMSO) in the surface water of the Yellow Sea and the Bohai Sea].
abstract: The horizontal distributions and diurnal variations of particulate and dissolved dimethylsulfoxide (DMSOp, DMSOd) were studied in the surface water of the Yellow Sea and the Bohai Sea in June, 2011. The determination of DMSO was based on the DMS produced by NaBH4 reduction, which was analyzed using the purge-and-trap technique coupled with gas chromatographic separation and flame photometric detection. The concentrations of DMSOp and DMSOd ranged from 5.43 to 18.35 nmol x L(-1) and from 4.75 to 43.80 nmol x L(-1), respectively, with average values of (11.47 +/- 0.25) nmol x L(-1) and (13.42 +/- 0.58) nmol x L(-1). The results showed that no relationship was found between DMSOp and environmental factors such as chlorophyll a (Chl-a), temperature and salinity, whereas a positive correlation was observed between DMSOp/Chl-a and salinity, indicating that intracellular DMSO could act as a cryo-osmoregulator. A significant relationship was also found between DMSOd and dimethylsulfide (DMS), whereas there was no relationship between DMSOd and DMSOp or DMSOd and bacteria, implying that DMSOd in the surface water was produced mainly through the photochemical oxidation of DMS. In addition, both the DMSOp and DMSOd concentrations exhibited obvious diurnal variations with the higher values in the day time.
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China. wangmin9320@163.com
authors.forename: Min
authors.initials: M
authors.lastname: Wang
authors.forename: Hong-Hai
authors.initials: HH
authors.lastname: Zhang
authors.forename: Gui-Peng
authors.initials: GP
authors.lastname: Yang
mesh_terms: D002681:China; D004121:Dimethyl Sulfoxide / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring; D009792:Oceans and Seas; D012621:Seasons; D012623:Seawater / Q000737:chemistry*; D013456:Sulfur Acids / Q000032:analysis / Q000737:chemistry*
chemical_list: D013456:Sulfur Acids; C097173:dimethyl sulfite; D004121:Dimethyl Sulfoxide