直接进样测汞法检测粮食中汞含量

Determination of mercury content in grain by direct injection method for mercury measurement

中文关键词:  汞  粮食检验  直接进样测汞法

英文关键词:mercury  grain detection  direct injection method for mercury measurement

中文摘要:

      目的 直接进样测汞法检测粮食中汞含量。方法 采用直接进样测汞法对小麦、玉米、稻谷等粮食样品进行检测, 并对该方法的检出限、准确性、稳定性以及加标回收率进行分析。结果 当称样量为0.1 g时, 小麦、玉米、稻谷样品中汞的方法检出限分别为0.070、0.075、0.085 μg/kg, 均小于0.2 μg/kg; 质控样品的检测结果为39.42 μg/kg, 在指定值范围内; 汞的重复性检测, 相对标准偏差在5%以内, 满足汞检测的稳定性要求; 汞的加标回收率为92.2%~101.4%。结论 与传统的汞分析方法相比, 直接进样测汞法具有操作步骤简便、重复性好、结果快速、准确等优点, 是一种值得推广的粮食中汞含量快速检测法。

英文摘要:

      Objective To detect mercury content in grain by direct injection method for mercury measurement. Methods Direct injection method for mercury measurement was used to detect grain samples such as wheat, corn, and rice, and the limit of detection, accuracy, stability, and spiked recovery rate of the method were analyzed. Results When the sample size was 0.1 g, the limits of detection mercury in wheat, corn, and rice were 0.070, 0.075, 0.085 μg/kg, all of which were less than 0.2 μg/kg. The detection results of the quality control sample was 39.42 μg/kg, which was within the specified value range. The repeatability of mercury detection, with a relative standard deviation within 5%, met the stability requirements for mercury detection. The recovery rate of mercury spiked samples were 92.2%~101.4%. Conclusion Compared with traditional mercury analysis methods, direct injection method for mercury measurement has the advantages of simple operation steps, good repeatability, fast and accurate results, and is a recommended method for rapid detection of mercury content in grain.