Field validation of the new miniature Versatile Aerosol Concentration Enrichment System (mVACES)
Field validation of the new miniature Versatile Aerosol Concentration Enrichment System (mVACES)
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DOI：
10.1080/02786820600996422
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发表时间：
2006-12-01
影响因子：
5.2
通讯作者：
Sioutas, Constantinos
中科院分区：
文献类型：
--
作者：
Ning, Zhi;Moore, Katharine F.;Sioutas, Constantinos
最近，南加州大学开发了一种新型紧凑型气溶胶浓度浓缩系统，专门用于以适合与质谱仪等化学分析的在线连续气溶胶仪器连接的流速和压力提供充满颗粒的空气。微型多功能气溶胶浓度浓缩系统（mVACES）的重新设计和工程以及主要基于实验室的各个组件和整个系统的验证先前已被报道过（Geller 等人，2005 年）。 2005 年 9 月至 12 月，mVACES 的现场性能验证研究在加利福尼亚州洛杉矶一个受高速公路交通和建筑影响的混合城市场地进行。进行了各种连续和半连续的物理和化学成分测量，以评估 mVACES 与公认的验证方法相比的性能。 mVACES 在质量和数量分布方面观察到近乎理想的气溶胶浓度增强性能，且尺寸分布失真的证据极少。同样，无机和有机物种都观察到接近理想的浓度增强因子，这表明 mVACES 在外部混合的城市气溶胶范围内同样有效。数据表明，在所研究的环境条件下，在城市环境中，输送流量中的气溶胶浓度可轻松实现理想的 20 倍增强，输送流量约为 1.5 升 min(-1)。
Recently a new compact aerosol concentration enrichment system was developed at the University of Southern California, specifically intended to provide particle-laden air at flow rates and pressures suitable for interfacing with on-line continuous aerosol instrumentation for chemical analysis such as mass spectrometers. The re-design and engineering of the miniature Versatile Aerosol Concentration Enrichment System (mVACES) and primarily laboratory-based validation of the individual components and overall system has been previously reported (Geller et al. 2005). From September to December 2005, a field performance validation study of the mVACES was conducted in Los Angeles, California at a mixed urban site influenced by both freeway traffic and construction. A variety of continuous and semi-continuous physical and chemical composition measurements were performed to assess the performance of the mVACES compared to accepted methods for validation. Near-ideal performance for aerosol concentration enhancement by the mVACES was observed for mass and number distribution with minimal evidence for distortion of the size distribution. Similarly, near-ideal concentration enhancement factors were observed for both inorganic and organic species suggesting that the mVACES works equally well across the range of externally mixed urban aerosol. The data suggest that aerosol concentration enhancements up to an ideal factor of 20 in a delivered flow on the order of 1.5 liters min(-1) are readily achievable in an urban environment for the ambient conditions studied.