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Needle Trap Sampling with Gas Chromatography Analysis to Determine Short Term Exposure Limit and Ceiling Concentrations for Selected Organic Vapors
Uniformed Services University Of The Health Sciences Bethesda United States
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A needle trap device NTD was used for rapid 60s quantitative sampling of short term exposure limit STEL and ceiling C concentration using a manually operated pump to collect small volume 10 ml vapor samples of methylene chloride, benzene, toluene, and tetrachloroethylene. Solventless introduction of chemical samples for gas chromatography GC analysis with flame ionization detection FID yielded linear results 0.99 Rexpn 2 for vapor standard mixtures of the four target analytes ranging from 10 to 200 of their respective STEL and C concentrations. The NTDs showed storage stability 86 recovery at room temperature over a 14-day test period. Due to the brief sampling period and avoidance of solvent dilution, the use of NTDs for STELC measurements can allow industrial hygienists to collect occupational and environmental samples that reflect a nearly instantaneous exposure concentration.
APPROVED FOR PUBLIC RELEASE