a b s t r a c tIn this study, a simple and fast method was developed for the analysis of trihalomethanes (THMs) in soft drink samples using headspace solid-phase microextraction coupled with gas chromatography (HS-SPME-GC). The influence of factors, such as, extraction temperature, extraction time, addition of sodium chloride and agitation speed on extraction yield was studied through an univariate experimental design strategy. Satisfactory recoveries (P90%) and precision, calculated as the relative standard deviations (RSD 6 11%), were obtained. The limit of detection (LOD) between 0.22 and 0.46 lg L À1 was achieved for THMs along with a wide linear range of concentrations. The applicability of the proposed method was demonstrated by analysing 74 real soft-drink samples. Since no matrix effects were observed, quantification could readily be carried out by external calibration with deionized water standards.