U. S. EPA, Attn: Purchasing, P.O. Box 93478, Las Vegas, NV 89193-3478

A -- METHODS VALIDATION/COMPARISON STUDY DUE 050199 POC Brian Schumacher, 702/798-2242 The U.S. Environmental Protection Agency's National Exposure Research Laboratory -- Environmental Sciences Division in Las Vegas, Nevada, is currently seeking a information on potential analytical laboratories to participate in a methods validation/comparison study for the analysis of the alkyl-phosphate metabolites from organophosphorus pesticides. Analyses will be performed on spiked and authentic human urine samples. It is anticipated that approximately 30 samples will be analyzed per participant in the study. Quoters are requested to provide the EPA with a summary of and a reference for the method used by the laboratory, cost per analysis (including routine laboratory quality assurance/quality control samples), and available method performance data for these analyses from the laboratory (e.g., method detection limits, accuracy, precision). Submit the information to: Brian Schumacher, U.S. EPA, P.O. Box 93478, Las Vegas, NV 89193-3478. THIS NOTICE IS FOR INFORMATION GATHERING ONLY. NO FUNDS ARE AVAILABLE AT THIS TIME FOR THIS REQUIREMENT. NO PHONE REQUESTS WILL BE ACCEPTED. Posted 04/08/99 (W-SN317908). (0098)

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