Needle Trap Sampling with Gas Chromatography Analysis to Determine Short Term Exposure Limit and Ceiling Concentrations for Selected Organic Vapors
Abstract
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 R[expn 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 STEL/C measurements can allow industrial hygienists to collect occupational and environmental samples that reflect a nearly instantaneous exposure concentration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 30, 2012
- Accession Number
- AD1013273
Entities
People
- Simon J. Strating
Organizations
- Uniformed Services University of the Health Sciences