Purge and Trap

The P&T analysis of soil samples can be done by purging directly from the soil, extracting the target analytes with a solvent, by purging the extract, or just by purging a solvent-soil mixture. Purging directly from the soil requires higher extraction temperatures as well as longer heating and purging times than those for purging the extract or the soil-water mixture. This behavior shows how the use of a solvent helps to extract analytes more easily from the soil due to the decrease of the analyte-matrix interaction.

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