直接测汞仪测定食品中总汞

Determination of total mercury in food by direct mercury analyzer

中文关键词:  总汞  直接测汞仪  食品

英文关键词:total mercury  direct mercury analyzer  food

中文摘要:

      目的 建立直接测汞仪测定食品中总汞的方法。方法 采用直接测汞仪测定食品中的总汞, 并对FAPAS 07322大豆粉样品采用直接测汞仪法、原子荧光光谱法、电感耦合等离子质谱法测定进行方法比对, 结合FAPAS 07322能力验证报告对直接测汞仪法进行评价。结果 直接测汞法在低浓度范围(0~20 ng)和高浓度范围(20~300 ng)的相关系数均能达到0.999, 方法检出限为0.07 μg/kg, 精密度小于8.0%, 回收率范围为90.0%~103.5%。FAPAS 07322测定结果为323 μg/kg, Z值为0.0, 接近实验室比对中位值。结论 直接测汞仪测定食品中的总汞, 操作简便快捷, 结果准确, 适用于食品中总汞的分析。

英文摘要:

      Objective To establish a method for the determination of total mercury in food by using the direct mercury analyzer. Methods Total mercury in food was determined by direct mercury analyzer. FAPAS 07322 soybean powder samples were determined by direct mercury analyzer, atomic fluorescence spectrometry, inductively coupled plasma mass spectrometry for comparation, and the direct mercury analyzer was evaluated in combination with FAPAS 07322 capability verification report. Results The correlation coefficients of direct measurement method of mercury in low concentration range (0?20 ng) and high concentration range (20?300 ng) were both up to 0.999. The limit of detection of this method was 0.07 μg/kg, the precision was lower than 8.0%, and recoveries ranged from 90.0% to 103.5%. The result of FAPAS 07322 was 323 μg/kg, and the Z-score was 0.0, which was close to the median value in laboratory comparison. Conclusion Using direct mercury analyzer for total mercury analysis in food is a fast, accurate and easy-to-use method, which is suitable for the analysis of total mercury in food.