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THEORETICAL DETERMINATION OF THE SAMPLING RATES OF DIFFUSION SAMPLERS FOR VOCS AND ALDEHYDES

机译:VOCS和醛扩散取样器采样率的理论测定

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This study attempted to derive the sampling rate (SR) for diffusion samplers from the geometry (diffusion area and diffusion length) of the samplers and the physical properties of volatile organic compounds (VOCs) based on Fick's law of diffusion. We tested seven types of diffusion aldehyde samplers and eleven types of diffusion VOC samplers marketed in Japan. SRs were also determined experimentally using simultaneous active (pump) and diffusion sampling. Vapor diffusion was used to generate a stable concentration of sample VOC and aldehyde gases of known concentrations, which were introduced into a 350 L chamber. Each sampler was exposed in the chamber for a specified period. For most samplers and most VOCs, the theoretically determined SRs were nearly the same as the experimentally established SRs. Thus, accurate calculation of SRs for VOCs based on the diffusion theory seems possible without the need to perform experimental measurements.
机译:该研究试图从采样器的几何形状(扩散区域和扩散长度)和基于Fick的扩散规律的挥发性有机化合物(VOC)的物理性质来得出用于扩散采样器的采样率(SR)。我们测试了七种类型的扩散醛采样器和在日本销售的十一类扩散VOC采样器。 SRS也使用同时活性(泵)和扩散采样进行实验确定。使用蒸汽扩散来产生已知浓度的稳定浓度的样品VOC和醛气体,其被引入350μl腔室中。每个采样器在腔室中暴露在特定时期。对于大多数采样器和大多数VOC,理论上确定的SRS与实验建立的SRS几乎相同。因此,在没有需要执行实验测量的情况下,基于扩散理论的基于扩散理论的VOCs的SRS的精确计算似乎是可能的。

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