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COMPARISON OF TWO DIFFERENT SOLID PHASE EXTRACTION/LARGE VOLUME INJECTION PROCEDURES FOR METHOD 8270
Citation:
Gregg*, D., M. Clarage*, AND D. A. Kovacs. COMPARISON OF TWO DIFFERENT SOLID PHASE EXTRACTION/LARGE VOLUME INJECTION PROCEDURES FOR METHOD 8270. Presented at 20th Annual National Environmental Monitoring Conference, Washington, DC, July 19 - 22, 2004.
Impact/Purpose:
To inform the public.
Description:
Two solid phase (SPE) and one traditional continuous liquid-liquid extraction method are compared for analysis of Method 8270 SVOCs. Productivity parameters include data quality, sample volume, analysis time and solvent waste.
One SPE system, unique in the U.S., uses automated in-line 10 mL sample extraction (Spark Holland "Triathalon" autosampler and Prospekt II" dual SPE cartridge exchanger) with large volume injector (ATAS/GL "Optic 3") and GC/MS (Agilent 6890/5973 GC/MSD). Two SPE cartridges were used in series to extract polar and nonpolar compounds. In-line injection of the 90-uL extract from a 10-mL sample resulted in detection limits 10-100 times below the recommended Method 8270 limits.
The second SPE system tested uses off-line sample preparation and is comprised of Horizon 4790 Solid Phase Extractors modified to accept 40-mL VOA vials, an ATAS/GL Optic 3 injection port, a 25-uL extract injection volume and an Agilent 6890/5973 GC/MSD.
The continuous liquid-liquid extractor was an "Accelerated One-Step" (AOS) from Corning. It uses a hydrophobic membrane, which allows for reduced solvent usage and a 1-liter sample volume.
The presentation will include the details of the SPE cartridges used as well as field and QC sample analysis results for a creosoting site in Texas.