基于气相色谱法的牛奶碘含量检测方法优化与比较研究OA

[Objective]This study focused on the optimization of the sample pretreatment process for the determination of iodine content in food by gas chromatography stipulated in"GB 5009.267-2020 Food Safety National Standard Determination of Iodine in Food",aiming to reduce the detection cost,shorten the detection time,and improve the detection efficiency and accuracy.[Method]Replace the separatory funnel with a centrifuge tube to reduce the sample weighing,increase the number of vortexing and centrifugation,and optimize the amount of butanone added to explore the optimal detection method.[Result]The optimized gas chromatography method demonstrated excellent performance in terms of recovery rate,precision,repeatability and detection limit when compared with the gas chromatography method specified in the national standard.[Conclusion]By overcoming the cumbersome problem of pretreatment,the optimized gas chromatography method was possible to accurately and quickly determine the iodine content in milk,and it was suitable for the large-scale detection of iodine content in milk.