摘要
根据2011年6月对黄渤海进行的大面调查,分析研究了夏季表层海水中颗粒态和溶解态二甲亚砜(DMSOp、DMSOd)的水平分布及其周日变化特征.海水中DMSO首先采用NaBH4将其还原为二甲基硫(DMS),再利用冷阱吹扫-捕集气相色谱法进行间接测定.结果表明,表层海水中DMSOp浓度的变化范围是5.43～18.35 nmol·L-1,平均值为(11.47±0.25)nmol·L-1;DMSOd浓度的变化范围是4.75～43.80 nmol·L-1,平均值为(13.42±0.58)nmol·L-1.相关性分析显示:DMSOp与叶绿素a(Chl-a)、温度、盐度等不存在相关性,而DMSOp/Chl-a比值与盐度存在一定的正相关,表明DMSO在藻细胞内具有渗透压调节功能;DMSOd与细菌、DMSOp浓度不存在相关性,而与DMS浓度存在一定的正相关,表明表层海水中DMSOd的主要来源是DMS的光化学氧化.另外,DMSOp与DMSOd均呈现出明显的周日变化规律,白天时段浓度明显高于夜间时段.
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·L-1 and from 4.75 to 43.80 nmol·L-1,respectively,with average values of（11.47±0.25） nmol·L-1 and（13.42±0.58） nmol·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.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第1期45-50,共6页
Environmental Science
基金
国家自然科学基金重点项目(41030858)
教育部博士点新教师基金项目(20110132120010)
教育部"长江学者"奖励计划项目
山东省"泰山学者"建设工程项目
关键词
二甲亚砜
浓度分布
周日变化
黄海
渤海
dimethylsulfoxide
concentration distribution
diurnal variation
Yellow Sea
Bohai Sea
