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TO-15 or not TO-15

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TO-15 or not TO-15

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    1. TO-15 or not TO-15? James Picker, Ph.D.

    2. Objective

    4. H&P Mobile GeoChemistry Escondido, CA

    5. Summary EPA 8260 vs. TO-15/14A

    6. Similarities GC/MS Method (SCAN or SIM)

    7. Differences Standards and Sample Preparation

    8. Standards in Water or Air

    9. H&P Mobile GeoChemistry Escondido, CA Compounds Analyzed equally well by EPA 8260 or TO-15 BTEX, Trimethylbenzenes, Freons PCE, TCE, vinyl chloride, DCEs, 1,2- DCPE, 1,1,1,2- TCA 1,1,1-TCA,

    10. Compounds Analyzed with a slight high bias by EPA 8260 versus TO-15

    11. Compounds Analyzed with a high bias by EPA 8260 versus TO-15

    12. Differences II Calibration and Range

    13. Calibration Range MDL to highest standard assumes 20 cc sample

    14. Fail Levels TCE @ subslab TCE @ 5bgs

    15. Fail Levels Benzene @ subslab Benzene @ 5bgs

    16. Project BL 4FEB05 results in ug/L

    17. H&P Mobile GeoChemistry Escondido, CA Project MC 1FEB05 results in ppbv

    18. H&P Mobile GeoChemistry Escondido, CA Conclusions For most vapor intrusion compounds of interest, methods yield identical results For more water soluble compounds 8260 is within factor of 2. Fine for VI calculations A few compounds may require TO method. Some compounds may require 8260 method On-site analysis assists in decision making, regulatory QA requirements and assurance of tracer compound integrity

    19. H&P Mobile GeoChemistry Escondido, CA Recommendations Choose either or a combination of methods, depending on compounds and DLs required Select on-site analysis for decision making, regulatory QA requirements (assurance of tracer compound integrity, purge volume testing, etc.) Do onsite TO-15 where levels are low Do onsite 8260 where levels are moderate to high Follow with offsite TO-15 for Quality Assurance

    20. H&P Mobile GeoChemistry Escondido, CA

    21. H&P Mobile GeoChemistry Escondido, CA

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