摘要
文章采用GB/T 5750.6-2006中原子荧光法测定饮用水中汞含量,通过“鱼骨图”识别和分析各不确定度分量,建立数学模型,计算饮用水中汞含量的相对不确定度,合成的扩展不确定度为17.39%(K=2)。原子荧光法测定汞含量的不确定度主要来源是仪器、重复性和校正曲线产生的,可以通过定期检定设备和器具,按照作业指导书配置曲线,降低不确定度,提高检测结果的准确性,反映生活饮用水的质量水平。
In this paper,the atomic fluorescence spectrometry method in GB/T 5750.6-2006 is used to determine the mercury content in drinking water.The uncertainty components are identifed and analyzed via fishbone diagram',and the mathematical model is established to calculate the relative uncertainty of mercury content in drinking water.The combined expanded uncertainty is 17.39%(K=2).The main sources of uncertainty in the determination of mercury content by atomic fluorescence spectrometry are instruments,repeatability,and calibration curves.By regularly verifying equipment and appliances,and configuring the curve according to the operation instruction,the uncertainty can be reduced,improving the accuracy of the test results and reflecting the quality level of drinking water.
作者
胡乐晓
HU Lexiao(TUV Austria(Shanghai)Co.,Ltd.,Shanghai 200336,China)
关键词
饮用水
汞含量
不确定评估
原子荧光光度计
drinking water
mercury content
evaluation of uncertainty
atomic fluorescence spectrometry
