title: Determination of perfluorochemicals in cow's milk using liquid chromatography-tandem mass spectrometry.
abstract: This study describes a new method developed for  detection of 10 different perfluorochemicals (PFCs) in cow's milk, seven perfluorinated carboxylates and three perfluorinated sulfonate salts. After attempting multiple methods employing both acidic and basic extractions, a basic extraction using 10 mM sodium hydroxide in methanol digestion along with weak anion-exchange solid-phase extraction was employed. Vortex mixing and varying sonication times were compared as part of sample processing. Results show that sonication during sample processing yield decreased recovery of longer chain perfluorinated carboxylates. The final method developed was used to determine the concentration of PFCs in 12 raw and 49 retail milk samples from across the United States. With the exception of a single raw milk sample obtained from a dairy farm that had applied PFC containing biosolids to its fields, there were no milk samples containing PFCs.
authors.affiliation: Food and Drug Administration, Center for Food Safety and Applied Nutrition, College Park, Maryland 20740, United States. wendy.young@fda.hhs.gov
authors.forename: Wendy M
authors.initials: WM
authors.lastname: Young
authors.forename: Paul
authors.initials: P
authors.lastname: South
authors.forename: Timothy H
authors.initials: TH
authors.lastname: Begley
authors.forename: Gregory W
authors.initials: GW
authors.lastname: Diachenko
authors.forename: Gregory O
authors.initials: GO
authors.lastname: Noonan
mesh_terms: D000818:Animals; D002417:Cattle; D002853:Chromatography, Liquid / Q000379:methods*; D005466:Fluorocarbons / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis*; D008892:Milk / Q000737:chemistry*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D005466:Fluorocarbons