Abstract: A method for simultaneous determination of ions of fluoride,iodide,bromate radical and cyanide radical in cosmetics by ion chromatography was established.Conditions for pre-treatment of samples of cosmetics as well as operation of the instrument were optimized.NaOH solution was used as gradient elution agent and the anions were separated by an analysis column (IonPacAS11-HC,250 mm×4 mm).Content of the cyanide radical ion was quantified by electrochemical detector,while the fluoride ion,iodide ion and bromate radical ion were quantified by conductivity detector.The detection limits of fluoride ion,bromate radical ion,iodide ion and cyanide radical ion are 2.0,10.0,10.0 and 1.0 mg·kg^-1 respectively.The spiked recoveries are in the range of 78.5% to 110.6%.The relative standard deviations are 1.9% to 6.9%.The method can meet requirements of multiple ion detection in cosmetics.

Key words: cosmetics, ion chromatography, fluoride ion, iodide ion, bromate radical ion, cyanide radical ion