摘要
为研究厦门近岸海域挥发性有机硫化物（volatile organic sulfur compounds,VOSCs）的季节性变化特征,于2013年采集了厦门近海域4个季节典型时段的大气样品,并利用三段预浓缩和GC-MS联用技术的方法对挥发性有机硫化物的浓度进行了测定。研究结果表明：大气中VOSCs浓度季节变化显著,其中冬季最高（2 643.04 ng/m^3）,而夏季最低（829.08 ng/m^3）,主要受到夏季风速高和台风雨的吸收和稀释作用影响。对比不同采样点各种硫化物组分可知,羰基硫（COS）是厦门近海域大气中有机硫化物的最主要组分,浓度范围在757.14~1 373.50 ng/m^3,占总VOSCs的58.1%~75.8%。二甲基硫（DMS）和二甲基二硫醚（C2H6S2）在会展中心采样点的浓度最高,分别为143.54 ng/m^3（秋季）和406.10 ng/m^3（冬季）;甲硫醇（CH4S）和乙硫醚（C4H10S）在珍珠湾采样点的浓度最高,分别为439.14 ng/m^3（冬季）和411.61 ng/m^3（春季）。厦门近岸海域各站位点有机硫化物组分的浓度变化主要受到季节性差异、人为因素和气象因素等的影响。
To investigate the pollution characteristics of volatile organic sulfur compounds（VOSCs）in the offshore area of Xiamen,VOSCs samples collected in January,April,July and October 2013 representing the winter,spring,summer and autumn was determined using the method of combined techniques of preconcentration and gas chromatography and mass spectrometry（GC/MS）. Results showed that the seasonal variation of VOSCs concentrations was significant. The annual mean VOSCs concentration was highest in winter（2 643.04 ng/m^3） and lowest in summer（829.08 ng/m^3）,which might be mainly affected by the absorption and dilution of high speed wind and heavy rainfall in summer. Compared the components of VOSCs at various sampling sites,COS was the most important component with a concentration range of 757.14~1 374.50ng/m^3,which accounted for 58.1%~75.8% of VOSCs. The concentrations of DMS and C2H6S2 were highest in the Conference Exhibition Center, which reached 143.54 ng/m^3（autumn） and 406.10 ng/m^3（winter） respectively. The highest concentrations of CH4 S and C4H10 S were observed in Pearl Bay,which reached 439.14 ng/m^3（winter） and 411.61 ng/m^3（spring） respectively. The variation of concentrations of VOSCs components at different sites were mainly related with seasonal difference,human factors and meteorological factors.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第1期111-116,共6页
Environmental Science & Technology
基金
厦门市科技计划项目(3502Z20122013)
环保公益性行业科研专项(201009004)
关键词
厦门近岸海域
大气
挥发性有机硫化物
季节变化
offshore area of Xiamen
atmosphere
volatile organic sulfur compounds
seasonal variation
