Journal of Environmental Health Sciences (한국환경보건학회지)

Korean Society of Environmental Health (한국환경보건학회)
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Sampling Efficiency of Organic Vapor Passive Samplers by Diffusive Length

확산길이에 따른 수동식 유기용제 시료채취기의 시료채취성능에 관한 연구

  • Lee, Byung-Kyu (Busan Regional Office, Korea Occupational Safety & Health Agency) ;
  • Jang, Jae-Kil (Occupational Safety & Health Training Institute, Korea Occupational Safety & Health Agency) ;
  • Jeong, Jee-Yeon (Department of Occupational & Environmental Health, Yongin University)
  • 이병규 (한국산업안전보건공단 부산지역본부) ;
  • 장재길 (한국산업안전보건공단 산업안전보건교육원) ;
  • 정지연 (용인대학교 환경보건학과)
  • Received : 2009.10.20
  • Accepted : 2009.12.10
  • Published : 2009.12.31
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Abstract

Passive samplers have been used for many years for the sampling of organic vapors in work environment atmospheres. Currently, all passive samplers used in domestic occupational monitoring are foreign products. This study was performed to evaluate variable parameters for the development of passive organic samplers, which include the geometry of the device and diffusive length for the sampler design. Four prototype diffusive lengths; A-1(4.5 mm), A-2(7.0 mm), A-3(9.5 mm), A-4(12.0 mm) were tested for adsorption performances to a chemical mixture (benzene, toluene, trichloroethylene, and n-hexane) according to the US-OSHA's evaluation protocol. A dynamic vapor exposure chamber developed and verified by related research was used for this study. The results of study are as follows. The results in terms of sampling rate and recommended sampling time test indicate that the most suitable model was A-3 (9.5 mm diffusive lengths on both sides) for passive sampler design in time weighted average (TWA) assessment. Sampling rates of this A-3 model were 45.8, 41.5, 41.4, and 40.3 ml/min for benzene, toluene, trichloroethylene, and n-hexane, respectively. The A-3 models were tested on reverse diffusion and conditions of low humidity air (35% RH) and low concentrations (0.2 times of TLV). These conditions had no affect on the diffusion capacity of samplers. In conclusion, the most suitable design parameters of passive sampler are: 1) Geometry and structure - 25 mm diameter and 490 $mm^2$ cross sectional area of diffusion face with cylindrical form of two-sided opposite diffusion direction; 2) Diffusive length - 9.5 mm in both faces; 3) Amount of adsorbent - 300 mg of coconut shell charcoal; 4) Wind screen - using nylon net filters (11 ${\mu}m$ pore size).

Keywords

References

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