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Representative chromatogram obtained from the analysis of a sample with 1 mg L−1 of PFOA by FIA-HRMS. (A) Extracted ion chromatogram (EIC) for the internal standard (perfluorononanoic acid, m/z 462.9632). (B) EIC for PFOA (m/z 412.9664). (C) Mass spectrum of PFOA and PFNA. Mass accuracy < 5 ppm.
