Fan을 이용한 고유량 수동적 시료 채취기 개발에 관한 연구

Abstract

It has been suffered from low sampling rates to use passive samplers in the industrial hygiene field especially for STEL measurement. In addition, passive samplers can be used only when air velocity exceeding 0.3m/s due to starvations of organic molecules inside the samplers when the air velocity is below than 0.3m/s. A new Fan-Passive Sampler was designed by attaching a small fan on the passive sampler. To test this concept, a small CPU fan was attached on the 3M badges(passive sampler). With this Fan-Passive Samplers, sampling rates were compared between the Fan-Passive samplers and original 3M badges in the test chamber where air velocity can be controlled. Experiments were conducted for benzene, toluene, and o-xylene. The results are as follows: 1) For high air velocity conditions(＞0.3 m/s), it was found that the sampling rate of the Fan-Passive sampler was around 5% higher than that of 3M badges. 2) For low air velocity conditions(＜3 m/s), the sampling rate for the Fan-Passive sampler was not decreased. However, the sampling rate of the original 3M badges was dramatically dropped. Thus, the original 3M badges are not suitable to collect samples under the condition of no air flow. However, it was possible to overcome this limitation by attaching a small fan on the 3M badges. 3) It was shown that the trend of sampling rate increases for benzene, toluene and a-xylene was same.