A VOLATILE AEROSOL SAMPLER AND PARTICLE SIZE ANALYZER

评估工人接触挥发性有机化学品（VOC）的情况需要 测量气相和共存气体的气载浓度 因为所得到的吸入剂量可以不同 实质上。 美国政府工业卫生学家会议 （ACGIH）建议建立双重阈值限值（TLV）， 挥发性物质的两相。 然而，由于颗粒 取样过程中颗粒表面的蒸发和蒸汽吸收 目前使用的空气采样器不足以有效地 VOC蒸汽和颗粒的分离，目前还没有简单的 测量颗粒大小分布的现场取样方法， 含有VOC。 拟议研究的第一个目标是开发一个原型 用于气载非等动力分离的蒸气/粒子采样器（VPS） 含有VOC的颗粒和蒸气共存成两种可识别的 根据它们的微分惯性。 我们的第二个目标是 开发一个原型多蒸气/粒子采样器（MVPS）系统， 不仅可以分离蒸汽和颗粒， 含有VOC的颗粒的分类。 空气动力学截止 MVPS系统的尺寸将设计为1、2、3.5、5、10和20 微摩尔气动直径 其中，3.5和10微摩尔是ACGIH 规定的可吸入和胸腔微粒质量的微粒切割尺寸 分数，分别。 拟议的VPS采样器和MVPS粒子 尺寸分析系统将适合于监测空气中的 工业喷雾工作环境中的VOC浓度，例如 强化塑料工业和喷漆室。 他们是 相对简单和便宜的现场采样装置，并将提供 评估工人暴露于蒸汽的基本数据， 挥发性有机化合物的颗粒相和重要的参考数据， 两个阶段的阈值限值（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.