Abstract
There is limited information about agricultural and aquatic products and water perfluorinated compound (PFCs) concentrations in China. First, a new isotopic dilution LC-MS/MS method was developed preliminarily to mainly determine perfluorooctanoate (PFOA) and perfluorooctane sulfonate (PFOS) in biota (e.g., channel catfish, crayfish, and hen eggs), and water in this study, and especially for the first time, determine PFOA and PFOS in crayfish. Liquid-solid/liquid-liquid extraction and silica column chromatography cleanup for biota sample preparations were used; some important steps and crucial parameters were modified compared with other published methods and LC and MS/MS conditions were optimized. The limits of quantitation values of 0.04 and 0.2 ng g−1 wet weight in biota were calculated for PFOA and PFOS, respectively; limits of quantitation values of 0.1 and 0.5 ng L−1 in water for PFOA and PFOS, respectively. Using the established methods, PFOA and PFOS emerged in 2 of 40 channel catfish, 5 of 40 crayfish, 3 of 40 home-produced eggs, 3 of 40 water for aquaculture crayfish, 1 of 20 Yangtze River water, and 1 of 20 Hanjiang River water and in low-ng g−1 wet weight for agricultural and aquatic products and low- ng L−1 for water.
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