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目的:建立一种采用离子排斥色谱法,抑制型电导检测测定食品中有机酸的方法。方法:食品样品经过一定的前处理进样分析,选择的色谱条件是:IonPac ICE-AS6离子排斥柱,全氟辛酸等度淋洗,抑制型电导检测。结果:测定的有机酸含量在0.2μg/ml~40.0μg/ml浓度范围内呈良好线性关系,相关系数r均大于0.999,测定相对标准偏差均小于4%,回收率在85%~104%之间。结论:该方法灵敏度高,选择性好,操作简单,价格便宜。
Objective: To establish a method of determination of organic acids in foods by ion-exclusion chromatography and suppressed conductivity detection. Methods: The food sample was subjected to a certain pretreatment injection analysis. The chromatographic conditions selected were IonPac ICE-AS6 ion exclusion column, isocratic leaching of PFOA, and inhibition-type conductivity detection. Results: The linear range was 0.2μg / ml ~ 40.0μg / ml. The correlation coefficients were all greater than 0.999. The relative standard deviations were less than 4% and the recoveries were between 85% and 104% between. Conclusion: The method has high sensitivity, good selectivity, simple operation and low price.