气相色谱法测定三氯蔗糖中的甲醇残留量
发布时间:2018-07-14 12:16
【摘要】:目的:建立测定三氯蔗糖中甲醇残留量的方法。方法:采用顶空毛细管气相色谱法。色谱柱为DB-624毛细管色谱柱,柱温采用程序升温(初始温度35℃,保持5 min,以50℃/min升温至200℃,保持5 min),检测器为氢火焰离子化检测器。进样口温度为220℃,检测器温度为250℃,载气为氮气,流速为2.0 ml/min,分流比为10∶1,顶空温度为80℃,平衡时间为30 min,进样量为1 ml。结果:甲醇质量浓度在98.99~296.96μg/ml范围内与峰面积比值呈良好的线性关系(r=0.999 9);精密度、稳定性、重复性试验的RSD均≤2.16%;平均加样回收率为100.20%,RSD为0.48%(n=9)。三氯蔗糖最低检测限为1.39μg/ml。3个厂家样品中有1个厂家的甲醇残留量为3.12μg/ml,另2个厂家的甲醇残留量低于最低检测限。结论:该方法简便、快捷,适用于三氯蔗糖中甲醇的残留量测定。
[Abstract]:Objective: to establish a method for the determination of methanol residues in sucrose trichloride. Methods: headspace capillary gas chromatography was used. The column was DB-624 capillary column. The column temperature was programmed (initial temperature 35 鈩,
本文编号:2121615
[Abstract]:Objective: to establish a method for the determination of methanol residues in sucrose trichloride. Methods: headspace capillary gas chromatography was used. The column was DB-624 capillary column. The column temperature was programmed (initial temperature 35 鈩,
本文编号:2121615
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