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A new flow-through directional passive air sampler: sampler design, performance and laboratory testing for monitoring ambient nitrogen dioxide

机译:新型流通式定向无源空气采样器:采样器的设计,性能和实验室测试,用于监测环境二氧化氮

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摘要

A new type of passive air sampler for monitoring trace air pollutants in ambient air is introduced. It has a rotatable upper part that can turn into the prevailing wind direction. Pollutants from different directions are transported through a specially–shaped air channel in the upper part and retained on different parts of a sample carousel in the fixed lower part. Pollution sources are trackable by examining the pollutant distribution in the carousel. The design of this new directional passive air sampler (DPAS) is described. Wind tunnel tests show the DPAS responding to wind direction changes at wind velocities as low as 0.9 m s ‐1. Measurements of wind velocities inside and outside the DPAS revealed good correlation for potential quantitative results. The DPAS was tested at a wind velocity of 2.0 m s ‐1using stainless steel meshes impregnated with triethanolamine (TEA) for nitrogen dioxide (NO2). The source direction was clearly identifiable. Further tests and field trials are advocated.
机译:引入了一种新型的被动空气采样器,用于监测周围空气中的痕量空气污染物。它具有可旋转的上部,可以旋转到盛行的风向。来自不同方向的污染物通过上部的特殊形状的空气通道传输,并保留在固定底部的样品转盘的不同部分。通过检查轮播中的污染物分布,可以跟踪污染源。描述了这种新型定向无源空气采样器(DPAS)的设计。风洞测试表明,DPAS在低至0.9 m s -1的风速下对风向变化的响应。 DPAS内部和外部的风速测量显示了潜在的定量结果具有良好的相关性。使用浸有三乙醇胺(TEA)的不锈钢网过滤二氧化氮(NO2),以2.0 m s -1的风速对DPAS进行了测试。来源方向很明显。提倡进一步的测试和现场试验。

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