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Supercritical fluid extraction and solid-phase extraction of AC 263, 222 and imazethapyr from three Texas soils.

Supercritical fluid extraction (SFE) using CO(2) and solid-phase extraction (SPE) are two technologies recently discussed in the literature as alternatives to Soxhlet and liquid/liquid extraction (LLE). This research compared SFE and SPE extraction efficiency of two imidazolinone herbicides, AC263,222 and imazethapyr, from three soils. Recovery of the herbicides using SFE-CO(2) with a 4.6:1 acetonitrile:acetic acid cosolvent was approximately 80% for Poth and Tremona soils and 60% when extracted from Ships soil with high clay content and high pH. SPE recovery of both herbicides averaged 78% and was not statistically different between soils. Combining SPE disks with a SPE cartridge cleanup procedure provided a faster filtration with cleaner filtrate compared with using SPE C-18 cartridges by themselves. Cleanup was needed after both SFE and SPE disk extraction due to interfering peaks in the chromatography. http://link.springer-ny. com/link/service/journals/00244/bibs/37n4p440.html</++ +HEA[1]

References

  1. Supercritical fluid extraction and solid-phase extraction of AC 263, 222 and imazethapyr from three Texas soils. Pace, P.F., Senseman, S.A., Ketchersid, M.L., Cralle, H.T. Arch. Environ. Contam. Toxicol. (1999) [Pubmed]
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