title: Supercritical fluid extraction and solid-phase extraction of AC 263, 222 and imazethapyr from three Texas soils.
abstract: 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
authors.affiliation: DeKalb Genetics Corporation, 3100 Sycamore Rd., DeKalb, Illinois 60115, USA.
authors.forename: P F
authors.initials: PF
authors.lastname: Pace
authors.forename: S A
authors.initials: SA
authors.lastname: Senseman
authors.forename: M L
authors.initials: ML
authors.lastname: Ketchersid
authors.forename: H T
authors.initials: HT
authors.lastname: Cralle
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D000097:Acetonitriles / Q000737:chemistry; D002245:Carbon Dioxide / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D006540:Herbicides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry*; D009539:Nicotinic Acids / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D013781:Texas
chemical_list: C402785:AC 263,222; D000097:Acetonitriles; D006540:Herbicides; D007093:Imidazoles; D009539:Nicotinic Acids; D012989:Soil Pollutants; D002245:Carbon Dioxide; C093630:imazethapyr; D019342:Acetic Acid; C032159:acetonitrile