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Abstract
A repository of 14 gaseous organic compounds at ppb levels in compressed gas cylinders has been established by the Environmental Protection Agency. This repository was established to provide audit materials for use in performance audits to assess and document the accuracy and precision of POHC measurements during hazardous waste trial burn tests. From this repository, gas cylinders containing five organic compounds in a balance gas of nitrogen were used to conduct performance audits during this study. The five compounds were: carbon tetrachloride, chloroform, perchloroethylene, vinyl chloride, and benzene.
Stability studies of the five compounds were performed. Results indicate that all five are adequately stable for use as reliable audit materials. Subsequent to completion of the stability studies, performance audits were conducted to assess the accuracy and precision of the Volatile Organic Sampling Train (VOST) and bag measurement methods. The audit results indicate that laboratories can use these methods to analyze POHC with accuracy to within the ±50% limits stated in the VOST protocol.