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Reduced VOC Sample Analysis Times Using a New Dual Purge-and-Trap System
Laura Chambers, Michael L. Duffy and Debbie Smith
With gas chromatography (GC) cycle times of 15 minutes or less becoming the standard for VOC applications, the time required for chromatographic separation is no longer the rate-limiting step. Purge-and-trap (P&T) cycle times can be as much as two to three times longer than the fastest GC cycles, potentially causing the GC/MS to sit idle and unproductive while the sample preparation step "catches up." To make full use of short GC runs and to prevent idle downtime on the mass spectrometer (MS), many laboratories are turning to dual P&T configurations to maximize VOC sample throughput. This new configuration eliminates GC/MS idle time and thereby nearly doubles laboratory productivity without the need for additional MS instrumentation.
A diagram of how one dual P&T system, the OI Analytical PT Express™, is configured with two sample concentrators and one GC is shown in Figure 1. Two P&T units with their associated autosamplers are "daisy-chained" together, allowing them to alternately deliver samples to one GC or GC/MS...
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OI Analytical
151 Graham Road
College Station, TX, 77842-9010
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