Industry: Environmental
Instrument: 3100 Purge and Trap Sample Concentrator
Effects of Purge and Trap Injection Techniques on Chromatography
Peak Shape and Sensitivity
In this paper, the research will identify injection techniques that can be used to improve chromatographic peak shapes when a purge and trap system is used as the sample introduction device for a gas chromatographic system. Methods such as cryogenic trapping and split flows will be evaluated to show the effects on peak shapes and sensitivity.
In an effort to increase throughput and sensitivity, peak shape has become a major focus for gas chromatographic methods. Improving peak shape has a direct effect on the quantitation as well as the resolution of complex mixtures. Sharper peaks yield lower detection limits as well as faster GC run times. When an introduction system for volatiles is incorporated in the chromatography system, peak shapes can suffer due to the additional volume in the sample pathway. Several injection techniques have been developed to improve peak shapes when volatiles introduction systems are used. In this paper, three different sample injection techniques are evaluated for chromatographic resolution, as well as linearity and precision.
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