【摘要】 建立了一种捕集、解析、氧化、紫外荧光检测技术,用于大气中痕量总挥发性有机硫化物的检测.自行研制的低温捕集-热解析装置综合了固体阻留法和低温冷凝法的优点,应用于大气中痕量挥发性有机硫化物的富集,富集的有机硫化物在高温和助燃气作用下,充分氧化为二氧化硫,采用紫外荧光法检测二氧化硫含量,从而间接获得大气中总挥发性有机硫化物的浓度值.方法的捕集温度5℃,解析温度150℃,氧化温度1 000℃,精密度5.46%,回收率为99.6%～109.2%.利用该装置测定了2011年2～4月青岛大气中痕量总挥发性有机硫化物的含量为42～195 ng·m-3.更多还原

【Abstract】 A detection technology was established comprising trap,desorption,oxidation and UV fluorescence determination process,and used for the test of total concentration of trace volatile sulfur compounds(VSCs) in the atmosphere.A cryogenic trap-thermal desorption device was developed,integrating the advantages of solid retention method and cryogenic condensation method,which was applied to capture and enrich trace volatile organic sulfur compounds.Under high temperature and combustion-supporting gas,the VSCs were completely oxidized into sulfur dioxide.By analyzing the content of sulfur dioxide through ultraviolet fluorescence method indirectly calculated to gain the total concentration of volatile organic sulfur compounds.The trapping temperature,desorption temperature and the oxidation temperature were 5℃,150℃ and 1 000℃,and the precision and recovery of the method were 5.46% and 99.6%-109.2%,respectively.The content of trace amounts of atmospheric VSCs determined from February to April at Qingdao was 42-195 ng·m-3.更多还原