Collection efficiency of various solid-phase traps for off-line supercritical fluid extraction

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Supercritical fluid extraction (SFE) is a powerful technique for sample preparation.
• Developing efficient off-line SFE methods is crucial for environmental monitoring.

Purpose of the Study:

• To evaluate solid-phase extraction (SPE) tubes as traps for off-line SFE.
• To assess the trapping efficiency of normal- and reversed-phase SPE traps for various analytes.
• To investigate the application of these traps for extracting polychlorinated biphenyls (PCBs) from river sediment.

Main Methods:

• Evaluation of normal- and reversed-phase SPE tubes as traps.
• Testing trapping efficiency with hydrocarbons, phenols, and a mixed analyte standard.
• Application of SPE traps for the extraction of PCBs from river sediment samples.
• Investigation of polyethylene frits as alternative solid-phase traps in SFE.

Main Results:

• SPE tubes demonstrated effectiveness as traps in off-line SFE.
• Normal- and reversed-phase traps showed varying efficiencies depending on the analyte.
• Successful extraction of PCBs from river sediment was achieved using the evaluated SPE traps.
• Polyethylene frits were also found to be suitable for solid-phase trapping in SFE.

Conclusions:

• SPE tubes are viable and efficient traps for off-line SFE applications.
• The choice of SPE trap phase influences trapping efficiency for different compound classes.
• This approach provides a robust method for the analysis of environmental contaminants like PCBs.