A method for the determination of three volatile elements( mercury,arsenic and selenium) in soils by one-time digestion was established. The digestion of samples was carried out in an automatic program temperature controlled graphite digestion instrument by aqua regia + hydrofluoric acid + boric acid. Hydride generation atomic fluorescence spectrometry( HG-AFS) was used to determine the contents of mercury,arsenic and selenium in the same digestion solution. The accuracy of the method was verified by the re...