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首页> 外文会议>Proceedings of the 7th Asian aerosol conference >Elemental Composition of Atmospheric Particles during Periods with and without Traffic Restriction in Beijing: The Effectiveness of Traffic Restriction Measure
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Elemental Composition of Atmospheric Particles during Periods with and without Traffic Restriction in Beijing: The Effectiveness of Traffic Restriction Measure

机译：北京有无交通限制时段大气颗粒物的元素组成：交通限制措施的有效性

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摘要

In order to evaluate the effectiveness of air pollution control through traffic restriction measure, continuous atmospheric particle samples were collected using step sampler at an urban site in Beijing in August 2007 during traffic restriction and non-restriction periods. Elements concentrations of aerosol samples were analyzed using Particle Induced X-Ray Emission (PIXE). As expected, the concentrations of most elements during the restriction period were considerably lower than those during the non-restriction period. The concentration ratios of most dust elements such as Al, Si, Ca, Ti, and Fe between the restriction and non-restriction periods were less than 0.3, indicating that the traffic restriction measure is an effective way in reducing soil dust trace elements in Beijing. The Enrichment factor (EF) values of elements Al, Si, K, Ca, Ti, Cr, Mn, and Fe were lower than 10 during both the restriction and non-restriction periods while EF values of other elements were in the range of 20-2000 during both periods. The EF values of Cl and Ni were lower during the restriction period compared to the non-restriction periods while the EF of S, Zn, As, and Br were higher during the restriction period. Soil dust concentrations during the traffic restriction period were only about 1/5 of those during the non-restriction period. These results suggested that traffic restriction is more effective on reducing dust elements concentrations, but less effective on reducing anthropogenic elements concentrations.
机译：为了通过交通限制措施评估空气污染控制的有效性，于2007年8月在交通限制和非限制期间，使用步进采样器在北京的一个城市地点收集了连续的大气颗粒样品。使用粒子诱导X射线发射（PIXE）分析气溶胶样品的元素浓度。不出所料，限制期内大多数元素的浓度均低于非限制期。限制期和非限制期之间大多数粉尘元素如Al，Si，Ca，Ti，Fe的浓度比均小于0.3，这表明交通限制措施是减少北京土壤粉尘中微量元素的有效方法。 。在限制和非限制期间，元素Al，Si，K，Ca，Ti，Cr，Mn和Fe的富集因子（EF）值均低于10，而其他元素的EF值在20的范围内在两个时期内均为-2000。与非限制期间相比，限制期间的Cl和Ni的EF值较低，而限制期间S，Zn，As和Br的EF较高。交通限制期的土壤粉尘浓度仅为非限制期的约1/5。这些结果表明，交通限制在降低灰尘元素浓度方面更有效，但在降低人为元素浓度方面效果较差。

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