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环境化学  2015 

大气中二甲基硫在线监测技术研发

Keywords: 二甲基硫,低温捕集,在线监测,燃烧源

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Abstract:

本研究研发出一种新型的大气二甲基硫在线监测及标定技术,采用低温捕集-热解析装置采样及气相色谱-火焰光度检测器(FPD)检测分析.环境大气样品经-20℃除水后,以60mL·min-1的流速在-100℃下被空石英毛细管捕集15min,然后在90℃下解析进入气相色谱分析,采用对含硫化合物具有很好选择性的FPD检测.该系统时间分辨率为30min,最低检出限为8.4ng·m-3,回收率为93.4%—95.9%(n=6),精密度为1.5%(n=6),可检测浓度范围为103.经过10d(2013年1月5日至1月14日)的连续观测表明北京城市冬季大气中二甲基硫的浓度平均值为20.4ng·m-3,且夜间浓度高于白天,燃烧源可能是北京冬季城市大气二甲基硫的来源之一.

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