• 关键词：气态  颗粒态  正构烷烃

• 基金项目：

• 仝青
• 内蒙古环境监测中心站,呼和浩特 010010

• 高春梅
• 内蒙古环境监测中心站,呼和浩特 010010

• 冯沈迎
• 内蒙古环境监测中心站,呼和浩特 010010

• 阮玉英
• 内蒙古环境监测中心站,呼和浩特 010010

• 乌兰
• 内蒙古环境监测中心站,呼和浩特 010010

• 摘要：采用聚氨基甲酸乙酯和玻璃纤维滤膜采集样品并测定。大气中总正构烷烃的浓度分布、气/固分布比与季节变化、污染源有关。在呼市大气中总正构烷烃(C₁₅-C₃₃),夏季主要存在气态中(78%).而冬季主要存在于颗粒物上(83%).内蒙古草原大气对照样品中,气态和颗粒物中总正构烷烃在冬夏两季所占百分比都约为50%.市区冬季大气颗粒物上的总正构烷烃浓度比其它城市结果高出1-2个数量级。

• Abstract：n-Alkanes are found to be present in Urban area,Huhhot and grasslands belt InnerMongolia atmosphere both in the particulate and gaseous state. A polyurethane foam and aglass fiber filter are used to collect vapor and particles sepaately. Dstribution and vapor/par-ticle partitioning are found to be seasonally and pollution dependent.Total n-alkane(C₁₃-C₃₃)concentration measured on the concurring samples are found mainly in the vapor phaseduring summer (78%)in the urban area of Huhhot atmosphere,while most of the total n-alkanes are present in the particulate phase during winter(83%).Precentage of concnetra-tion of total n-alkane(C₁₅-C₃₃)in the particulate and vapor state are approximately 50%for both during summer or winter in the atmosphere of the grasslands belt of lnner Mongo-lia. The levels of the total n-alkanes are one and two order of magnitude higher than thosereported for urban air.

• Key words：vapor phase  particulate  n-alkanes

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