Stability of Various Pesticides on Membranous Solid-Phase Extraction Media
by Senseman, S. A.; Lavy, T. L.; Mattice, J. D.; Myers, B. M.; Skulman, B. W.
The stability of various pesticides in water at 4-degrees-C was compared with their stability on C-18 SPE disks under three storage regimes. The disk storage regimes involved using the disk to extract the chemical from water, removing the disk and placing it in a plastic bag, and then storing it at either -20 or +4-degrees-C for 1 day and then -20-degrees-C for the remainder of the storage period. The storage periods included 0, 3, 30, 90, and 180 days. The percent recovery of each chemical was determined and used to compare storage treatments. Results indicate that the pesticides have equivalent or greater stability on solid-phase extraction disks compared to their storage in water at 4-degrees-C. The data suggest that freezing the disk after pesticide loading is the most favorable storage option. Results show that field extraction/storage methodology is feasible, which could improve the reliability of future environmental water sampling procedures.
- Journal
- Environmental Science and Technology
- Volume
- 27
- Issue
- 3
- Year
- 1993
- Start Page
- 516-519
- URL
- https://dx.doi.org/10.1021/es00040a010
- ISBN/ISSN
- 0013-936X
- DOI
- 10.1021/es00040a010