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目的建立自来水中钠元素的测量不确定度评定的方法。方法用火焰原子吸收法在589.6nm波长下直接测定自来水中钠的浓度,计算其不确定度。结果自来水中钠的浓度为(48.6070±0.5736)mg/L。由分析可知自来水中钠测定产生的不确定度主要来自标准溶液以及标准曲线的配制过程。结论建立的不确定度分析和计算方法适用于自来水中钠的不确定度评定。测定过程中要控制产生不确定度的主要环节。
Objective To establish a method to assess the uncertainty of measurement of sodium in tap water. Methods The concentration of sodium in tap water was determined directly by flame atomic absorption spectrometry at a wavelength of 589.6 nm, and its uncertainty was calculated. Results The sodium concentration in tap water was (48.6070 ± 0.5736) mg / L. The analysis shows that the uncertainty of sodium determination in tap water mainly comes from the standard solution and the standard curve formulation process. Conclusion The uncertainty analysis and calculation method established is suitable for the uncertainty assessment of sodium in tap water. Determination of the process to control the main part of the uncertainty.