Transcription of Comparison Between a Passive Organic Vapor …
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Comparison Between a Passive Organic Vapor …
PO Box 894 DeMotte, IN46310 Fax w w w . a f c i n t l . c o mAFC Intern ational, Detection &Air Monitoring SpecialistsComparison Between a PassiveOrganic Vapor Monitor (OVM)and a Charcoal Tube for MonitoringBenzene, Ethyl Benzene, Toluene and XyleneBy: G. M. Mihaylov, K. S. Kirollos and K. B. Chapman, K&M Environmental, to increased awareness of the toxicity of Organic substances, government organization, such asthe Occupational Safety and Health Administration (OSHA) and the National Institute forOccupational Safety and Health (NIOSH), have continually decreased the permissible exposure limitsof many Organic substances. For example, in the last ten years, the permissible exposure limit forbenzene has been lowered from 10 to ppm. This has lead to an increased demand for samplingmethods and devices capable of measuring these low concentrations. Although Passive diffusivemethods have been used for more than a decade, there is still hesitation about their performance ascompared to the tube/pump Comparison study was conducted Between the traditional active charcoal/pump method and a diffu-sive Organic Vapor monitor (OVM).
Figure 1: Benzene Experimental Materials: Standard coconut charcoal tubes (100 mg front and 50 mg back section) were used throughout the study in conjunction with the Gilian sampling pump Model LFS-113. TraceAir organic vapor monitors were used as a representative of diffusive samplers.
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