Other than to improve the detection limits in capillary gas chromatography or its effect on the sensitivity, large volume injection can also be used as an alternative for an intermediate evaporative preconcentration step in an extraction procedure of a complex sample. This could, for example, be of advantage in the analysis of solid samples, such as soil or sediment samples or polymeric samples:
It will be evident from what has been stated above, that two important application areas of large volume injection are the improvement of detection limits in trace analysis and the reduction in the overall analysis time that can be obtained due to the elimination of the time consuming and laborious solvent evaporation step.
A third application area of large volume sampling is encountered in the on-line combination of sample pretreatment and chromatographic analysis. This direct combination is greatly simplified if the gas chromatograph can accept larger sample volumes than the standard microliter volumes. The advantages of on-line coupling of sample pretreatment and chromatographic analysis are very diverse. On-line systems are easier to automate, more sensitive, more rugged, more reliable and reduce the costs per sample.