This study describes the determination of fluorine evaluating the molecular absorption of barium monofluoride (BaF) at the rotational lines of 495.088 and 495.263 nm simultaneously using a high-resolution continuum source electrothermal atomic absorption spectrometer. Upon pipetting of samples together with Ba as its nitrate, BaF was generated in the gas-phase of the atomizer. All experiments were performed using pyrolytically coated graphite tubes/platforms and applying 900 degrees C for pyrolysis and 2200 degrees C for vaporization. In the presence of 50 mu g of Ba, a perfect linearity up to 0.1 mu g of F was maintained. The limit of detection and characteristic mass of the method were 0.105 ng and 0.055 ng of F, respectively. The F concentration of a standard waste water sample was found in the uncertainty limits of its certified value as well as spike additions were quantitatively recovered. Finally, F concentrations in various water and milk samples sold in markets were determined. (C) 2014 Elsevier B.V. All rights reserved.