建立了以顶空气相色谱测定食品中溴甲烷残留量的方法。把样品置于密封顶空瓶中，恒温后以顶空方式进样，配有μECD检测器的气相色谱测定，外标法定量。方法线性范围为10~100 μg/kg，检出限为10 μg/kg。添加回收率为95.9%~102.0%，变异系数为3.7%~6.5%。结果表明，该方法简单、灵敏、准确，适合食品中溴甲烷残留量的分析。

A method for the determination of bromomethane residues in food by headspace gas chromatography was developed. Samples in sealed bottles were determined by headspace gas chromatography with a μECD detector at constant temperature. Linear plots were obtained in range of 10~100 μg/kg withy the limit of detection (LOD) being of 10 μg/kg. Besides, Recoveries ranged from 95.9% to 102.0% at fortification and the coefficients of variation were between 3.7% and 6.5%. This method was shown to be simple, sensitive and precise.