A VOLATILE AEROSOL SAMPLER AND PARTICLE SIZE ANALYZER

评估工人接触挥发性有机化学品(VOC)需要 气相和共存气体在空气中浓度的测量 颗粒相分离，因为由此产生的吸入剂量可能不同 基本上是这样的。美国政府工业卫生师会议 (ACGIH)建议为以下对象建立双阈值限值(TLV) 挥发性物质的两个相。然而，由于粒子 采样中颗粒表面的蒸发和水蒸气吸收 过程中，目前使用的空气采样器不足以有效 VOC蒸气和颗粒的分离，目前还没有简单的 测量颗粒尺寸分布的现场取样方法 含有VOCs。 拟议研究的第一个目标是开发一个原型。 气/粒采样器(VPS)在气载各向异性分离中的应用 含有VOC的颗粒和共存的蒸汽分为两个可识别的 分数是根据它们的微分惯性决定的。我们的第二个目标是 开发了一个多蒸汽/粒子采样器(MVPS)原型系统，该系统 不仅可以分离蒸汽和颗粒，还可以提供尺寸 对含有VOCs的颗粒物进行分类。空气动力学截止线 MVP系统的规模将设计为1、2、3.5、5、10和20 微摩尔空气动力学直径。其中，3.5和10微摩尔是ACGIH 可吸入颗粒物和胸部颗粒物的定义颗粒物切割尺寸 分数分别为。建议的VPS采样器和MVPS颗粒 尺寸分析系统将适用于空气中的监测 工业喷雾作业环境中的VOCs浓度，例如 增强塑料行业和喷漆摊。他们是 相对简单和廉价的现场采样设备，将提供 评估工人接触蒸汽的基本数据和 挥发性有机化合物的颗粒相和建立对偶的重要参考数据 两个阶段的阈值极限值(TLV)。

Assessment of worker exposure to a volatile organic chemical (VOC) requires measuring the airborne concentration of the vaporphase and the coexisting particle phase separately because the resulting inhalation dose can differ substantially. American Conference of Governmental Industrial Hygienists (ACGIH) has suggested establishing dual Threshold Limit Values (TLVs) for the two phases of a volatile substance. However, due to particle evaporation and vapor absorption by the particle surface in the sampling process, air samplers presently in use are not adequate for efficient separation of the VOC vapor and particles and currently there are no simple field sampling methods to measure the size distribution of particles that contain VOCs. The first goal of the proposed research is to develop a prototype Vapor/Particle Sampler (VPS) for anisokinetic separation of the airborne VOC containing particles and coexisting vapor into two identifiable fractions according to their differential inertia. Our second goal is to develop a prototype Multiple Vapor/Particle Sampler (MVPS) system, which not only can separate vapor and particles, but also can provide the size classification of the particles that contain VOCs. The aerodynamic cut-off sizes of the MVPS system will be designed to 1, 2, 3.5, 5, 10 and 20 micromole aerodynamic diameter. Where, 3.5 and 10 micromole are the ACGIH defined particle cut sizes for respirable and thoracic particulate mass fractions, respectively. The proposed VPS sampler and the MVPS particle size analyzing system will be appropriate for monitoring the airborne concentrations of VOCs in the industrial spray work environment, such as the reinforced plastic industry and the paint spray booth. They are relatively simple and inexpensive field sampling devices and will provide essential data for the assessment of worker exposure to the vapor and particle phases of a VOC and important reference data for establishing dual Threshold Limit Values (TLVs) for both phases.