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首页> 外文会议>International Conference on Emerging Air Issues for the 21st Century: The Need for Multidisciplinary Management September 22-24, 1997 Calgary, Alberta, Canada >Continuous Ambient Mass Monitor
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Continuous Ambient Mass Monitor

机译：连续环境质量监测仪

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摘要

A Continuous Ambient Mass Monitor (CAMM) for fine particle mass has recently been developed and tested. The principle of this method is based on the measurement of pressure drop across a fibrous filtr (Flouropore~(TM) during particle sampling. The monitor consists of a conventional impactor/inlet to remove particles larger than 2.5 mum, a filter tape to collect particles, a filter tape transportation system to allow for several weeks of unassisted sampling, a diffusion dryer to remove particle-bound water, and a data acquisition and control unit. For each sampling period a new segment of the filter tape is exposed so that particles remain in equilibrium with the sample air during their collection. This results in minimization of volatilization and adsorption artifacts thus rendering this method to be more accurate. Furthermore, since the required flow rate for the fine particle meass monitoring channel is only 0.3 liters/min, the relative humidity of the air sample can be easily reduced to 40percent or less using a Nafion~(TM) diffusion dryer, to remove particlebound water. The sensitivity of the CAMM method for PM_(2.5) is high, with a detection limit of less than 5mug/m~3 for a one-hour mean.
机译：最近已经开发并测试了用于细颗粒质量的连续环境质量监控器（CAMM）。该方法的原理是基于在颗粒采样过程中跨纤维过滤器（Flouropore〜（TM））的压降的测量，该监测器由传统的撞击器/入口组成，以去除大于2.5微米的颗粒，并使用滤带收集颗粒，可以进行数周的无辅助采样的滤带运输系统，用于去除结合颗粒的水的扩散干燥器以及数据采集和控制单元，在每个采样周期内，都要露出新的滤带片段，以便保留颗粒在收集过程中与样品空气保持平衡，从而最大程度地减少了挥发和吸附伪影，因此使该方法更加准确；此外，由于细颗粒计量监测通道所需的流量仅为0.3升/分钟，因此使用Nafion〜（TM）扩散干燥机可以轻松地将空气样品的相对湿度降低到40％或更低，以去除颗粒结合的水。 CAMM方法对PM_（2.5）的适用性很高，其检测限为一小时平均值，小于5mug / m〜3。

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