1. U.S. Environmental Protection Agency, National Exposure Research Laboratory, Athens, Georgia 30605, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, Georgia 30341, College of Marine Studies, University of Delaware, Lewes, Delaware 19958, CanSyn Chem. Corp., 200 College Street, Toronto, Canada M5S 3E5, U.S. Environmental Protection Agency, National Risk Management Research Laboratory, Cincinnati, Ohio 45268, and College of...