On-site and on-line analysis of chlorinated solvents in ground water usingpulse introduction membrane extraction gas chromatography (PIME-GC)

The objective of this research was to monitor the concentration of chlorina ted solvents in groundwater using pulse introduction membrane extraction ga s chromatography (PIME-GC) developed in our laboratory. This technique uses membrane permeation to isolate VOCs from the aqueous sample. The gas chrom atography based instrument can identify different VOCs components at the pp b level. In this study, PIME-GC was used for two different applications rel evant to ground water remediation. The first was site assessment, where wat er samples from drilled wells were analyzed on-site using the field portabl e instrument. The results were compared to results from parallel analysis b y standard laboratory based methods. The PIME-GC was also used for continuo us monitoring of influent streams at the pump and treat facility. This stud y showed that it was possible to carry out both types of analysis at low pp b levels using PIME-GC.