Development of a Personal Sampler for Evaluating Exposure to Ultrafine Particles
Development of a Personal Sampler for Evaluating Exposure to Ultrafine Particles
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DOI：
10.4209/aaqr.2009.06.0040
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发表时间：
2010-02
影响因子：
4
通讯作者：
M. Furuuchi;T. Choosong;M. Hata;Y. Otani;P. Tekasakul;M. Takizawa;M. Nagura
中科院分区：
文献类型：
--
作者：
M. Furuuchi;T. Choosong;M. Hata;Y. Otani;P. Tekasakul;M. Takizawa;M. Nagura
评估人类暴露于超细空气颗粒是工作场所健康的一个重要方面，特别是在存在纳米颗粒的情况下。然而，用于有效地收集工人呼吸区中的超细颗粒的便携式采样装置并不容易获得。本研究描述了一种便携式采样器的设计和开发，用于收集呼吸区的颗粒物，作为一种可能的工具，用于此目的。该设计基于使用“惯性过滤器”来分离各种尺寸的纳米级颗粒。使用由SUS纤维毡（纤维直径5.6-13.5 μm）组成的惯性过滤器，其放置在圆形喷嘴（直径3-6 mm，长度4.5 mm）中。为了在便携式泵允许的压降下获得最小的dp 50，研究了纤维负载量对分离性能和压降的影响。还研究了颗粒负载对压降和分离性能的影响。对于直径为5.6和9.8 μm的SUS纤维（颗粒体积分数约为0.013），在所用电池泵的允许压降（5.7 kPa，6 L/min）下的最小dp 50分别为约140和200 nm。经确认，在当前条件下使用时，颗粒负载导致的分离性能变化可接受。在这些条件下，可以收集足够量的颗粒用于化学分析，例如，采样6-8小时后，颗粒结合的多环芳烃。因此，开发的采样器有可能用于评估暴露于超细颗粒物在工作场所的呼吸区。
Evaluation of the exposure of humans to ultrafine, airborne particles is an important aspect of health in the workplace, especially in cases where nano-particles are present. However, portable sampling devices for efficiently collecting ultrafine particles in a worker's breathing zone are not readily available. The present study describes the design and development of a portable sampler for collecting particulates in the breathing zone, as a possible tool for this purpose. The design is based on the use of an ”Inertial Filter” to separate various-sized nano-order particles. Inertial filters consisting of SUS fiber felt (fiber diameter 5.6-13.5 μm) placed in circular nozzles (3-6 mm diameter with 4.5 mm length) were used. To achieve the smallest dp50 under the allowable pressure drop of a portable pump, the influence of fiber loading on separation performance and pressure drop were investigated. The influence of particle loading was also examined in relation to pressure drop and separation performance. The smallest dp50 under the allowable pressure drop (5.7 kPa at 6 L/min) for the battery pump employed was ~140 and 200 nm respectively for SUS fibers of 5.6 and 9.8 μm diameter (particle volume fraction ~0.013). The change in separation performance due to particle loading was confirmed to be acceptable for use under the present conditions. Under these conditions, a sufficient amount of particles can be collected for chemical analyses, e.g., particle-bound PAHs after 6-8 hours of sampling. Hence, the developed sampler has the potential for use in evaluating exposure to ultrafine particles in the breathing zone in the workplace.