二氧化硫被动采样器的研制和应用

本文叙述了一个灵敏、轻便的被动式二氧化硫采样装置,将此装置与主动采样方法对比用于大气中SO_2含量的测定,被动方法测得的SO_2浓度对主动方法测得的SO_2浓度的相关系数为0.9904;用五个相同的被动采样器在相同时间、相同地点测得的SO_2浓度的相对标准偏差为2.8％;采样周期可长达一个月或一个月以上。

STUDY ON SULPHUR DIOXIDE PASSIVE SAMPLER

A sensitive SO2 passive sampler for ambient air has been developed. In order to avoid turbulent diffusion inside the sampler,the inlet is covered by a thin porous membrane filter. Gases are transported by molecular diffusion in the laminar boundary layer in front of the membrane. The small device is simple and inexpensive. The performance of the sampler has been tested in the field. The concentrations of SO2 in air obtained by the passive method are in good agreement with those obtained by the active method(pump-based). The correlation coefficient of SO2 concentrations measured by passive method vs those measured by active method is found to be 0.9904. The relative standard deviation for quintuplicate sets of passive sampler is found to be 2.8%. The exposure time of the samper can be lasted over period of one month.