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Lucie Drabova and Jana Pulkrabova, Institute of Chemical Technology, Prague, Czech Republic Joe Binkley, Doug Staples, and Scott Pugh, Leco Corporation, St. Joseph, MI Bonita Taffe, Michigan Department of Community Health Bureau of Labs, Lansing, MI Jan Rosmus, State Veterinary Institute, National PAH Reference Laboratory, Prague, Czech Republic Katerina Bousova and Klaus Mittendorf, Thermo Fisher Scientific Food Safety Response Center, Dreieich, Germany  (1) Kalachova, K., Pulkrabova, J., Drabova, L., Cajka, T., Kocourek, V., & Hajslova, J. (2011) Anal. Chim. Acta 707 , 84–91.  (2) CONffIDENCE (2010) Contaminants in Food and Feed: Inexpensive Detection for Control of Exposure . http://www.  (3)  Official Methods of Analysis (2002) Guidelines for Collaborative Study Procedures to Validate Characteristics of a Method of Analysis , Appendix D. Methods/Collaborative_Study_Validation_Guidelines.pdf  (4) AOAC Spreadsheet for Blind Duplicates 2.0. http://www.aoac. org/stats/ References

blank mussel samples; homogenizing, weighing, and fortifying all samples; and shipping samples to the study participants. Cambridge Isotope Laboratories (Tewksbury, MA) is acknowledged for providing discounted 13 C-PAH standard mixtures, Shrimp Alliance for supplying blank shrimp samples, and Jo Marie Cook (Florida Dept. of Agriculture and Consumer Services, Tallahassee, FL) for securing blank oyster samples for the study. The Study Directors are very grateful to all laboratories that participated in the study and especially to the following collaborators, listed alphabetically based on their institution name: Rolando Perez, Jason Betz, and Steven Perez, Adpen Laboratories, Inc., Jacksonville, FL Ken Keide, Mark Misunis, and Jian Wang, Canadian Food Safety Inspection Agency, Calgary Laboratory, AB, Canada Jack Jabusch and John Schmitz, Covance Laboratories Inc., Madison, WI Jason Stepp, Walter Hammack, and Jo Marie Cook, Florida Dept. of Agriculture and Consumer Services, Tallahassee, FL Patricia Lopez-Sanchez, Radoslaw Lizak, and Thomas Wenzl, Institute for Reference Materials and Measurements, EU PAH Reference Laboratory, Geel, Belgium

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