直接进样测汞法测定生鲜乳中汞含量

Determination of mercury content in fresh milk by direct injection mercury determination

中文关键词:  直接进样测汞法  生鲜乳  汞含量  检测条件

英文关键词:direct injection mercury determination  fresh milk  mercury content  detection conditions

中文摘要:

      目的 建立直接进样测汞法测定生鲜乳中汞的分析方法。方法 分别以测汞仪的分解温度、分解时间以及进样量为变量考察其对检测信号的影响, 在最优测试条件下, 测试并计算该方法的线性关系、检出限、精密度及加标回收率。结果 确定最优的仪器测试参数为: 分解温度750 ℃、分解时间2 min、进样量0.10 g。在0~40 ng范围内呈良好的线性关系, 相关系数(r2)为0.9986, 方法的检出限为0.08 μg/kg, 在5~20 ng/g添加浓度范围内, 方法的平均回收率在93.1%~103.2%之间, 相对标准偏差(relative standard deviations, RSDs)小于5%。结论 该方法具有准确、可靠、简洁、高效等优点, 适用于生鲜乳样品中汞的检测。

英文摘要:

      Objective To establish a method for the determination of mercury in fresh milk by direct injection mercury determination. Methods The influence of decomposition temperature, decomposition time and injection volume of the detection signal were investigated. Under the optimal testing conditions, the linearity, detection limit, precision and recovery rate of the method were tested and calculated. Results The optimal parameters were determined as follows: Decomposition temperature 750 ℃, decomposition time 2 min, injection volume 0.10 g. There was a good linear relationship in the range of 0?40 ng, and the correlation coefficient (r2) was 0.9986, and the limits of detection were 0.08 μg/kg. The average recoveries were 93.1%?103.2% at the standard addition concentration of 5?20 ng/g. The relative standard deviations (RSDs) were less than 5%. Conclusion This method has the advantages of accuracy, reliability, simplicity and high efficiency. It is suitable for the determination of mercury in raw and fresh milk samples.