title: Drying and Storage Methods Affect Cyfluthrin Concentrations in Exposed Plant Samples.
abstract: Standard procedures do not exist for drying and storage of plant samples prior to chemical analyses. Since immediate analysis is not always possible, current research examined which plant drying and storage method yielded the highest cyfluthrin recovery rates compared to traditional mechanical freeze-drying methods. Fifteen mesocosms were planted with rice. Cyfluthrin (5 mg L(-1)) was amended into the water column of individual mesocosms. 48 h later, plant material in the water column was collected from each mesocosm. Control (mechanical freeze drying) recovery was significantly greater (p < 0.001) than all 14 combinations of drying and storage. Significant differences also existed between all 14 different combinations. Greatest cyfluthrin recoveries in non-control plants were from the freezer-greenhouse-freezer drying and storage method. Results offer evidence for the efficient plant drying and storage methods prior to cyfluthrin analysis. Future studies should perform comparable analyses on various pesticide classes to determine possible relationships.
authors.affiliation: Water Quality and Ecology Research Unit, USDA-ARS National Sedimentation Laboratory, 598 McElroy Drive, Oxford, MS, 38655, USA. matt.moore@ars.usda.gov.
authors.forename: M T
authors.initials: MT
authors.lastname: Moore
authors.affiliation: Covington Civil and Environmental, LLC, 2510 14th Street, Suite 1010, Gulfport, MS, 39501, USA.
authors.forename: R
authors.initials: R
authors.lastname: Kröger
authors.affiliation: Water Quality and Ecology Research Unit, USDA-ARS National Sedimentation Laboratory, 598 McElroy Drive, Oxford, MS, 38655, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: Locke
mesh_terms: D003890:Desiccation; D004784:Environmental Monitoring; D005612:Freeze Drying; D007306:Insecticides / Q000032:analysis* / Q000737:chemistry; D009570:Nitriles / Q000032:analysis* / Q000737:chemistry; D010944:Plants / Q000737:chemistry*; D011722:Pyrethrins / Q000032:analysis* / Q000737:chemistry
chemical_list: D007306:Insecticides; D009570:Nitriles; D011722:Pyrethrins; C052570:cyfluthrin
keywords: Analytical recovery; Pesticide; Pyrethroid insecticide; Rice