Development of a high volume cascade impactor for toxicological and chemical characterization studies
Development of a high volume cascade impactor for toxicological and chemical characterization studies
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DOI：
10.1080/02786820290092113
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发表时间：
2002-09-01
影响因子：
5.2
通讯作者：
Koutrakis, P
中科院分区：
文献类型：
--
作者：
Demokritou, P;Kavouras, IG;Koutrakis, P
本文介绍了一种紧凑型大容积级联冲击采样器的设计和研制。HVCI以900 l/min的流速运行，由4个配备圆形狭缝状加速喷嘴和备用过滤器的冲击阶段组成。备用过滤器位于第四级的下游，用于收集超细颗粒（d（p）< 0.1 μ m）。这种新型采样器的主要特点是能够在不使用粘合剂的情况下将相对大量的颗粒（mg-g水平）收集到相对较小的聚氨酯泡沫基材上。如前所述，冲击基质的容量为每平方厘米泡沫2.15克收集的颗粒。虽然冲击基板没有涂有粘合剂，如油脂或矿物油，颗粒反弹和再夹带损失被发现是不显着的。使用水萃取可以容易地从泡沫基材中回收颗粒。使用多分散颗粒校准冲击取样器。4个阶段的50%分割点分别为9.90、2.46、1.0和0.1 μ m。超细和细颗粒的级间损失
This paper presents the design and development of a compact high volume cascade impactor (HVCI). The HVCI operates at a flow rate of 900 1/min and consists of 4 impaction stages equipped with circular slit-shaped acceleration nozzles and a backup filter. The backup filter is placed downstream of the fourth stage and is used to collect the ultrafine particles (d(p) < 0.1 mu m). The major feature of this novel sampler is its ability to collect relatively large amounts of particles (mg-g levels) onto relatively small polyurethane foam substrates without using adhesives. As previously reported, the capacity of the impaction substrate is 2.15 g of collected particles per cm 2 of foam. Although the impaction substrates are not coated with adhesives such as grease or mineral oil, particle bounce and re-entrainment losses were found not to be significant. Particles can be easily recovered from the foam substrates using aqueous extraction. The impactor was calibrated using polydisperse particles. The 50% cutpoints of the 4 stages were 9.90, 2.46, 1.0, and 0.1 mu m, respectively. Interstage losses of ultrafine and fine particles were