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目的评定石墨炉-原子吸收法测定饮用纯净水中铅含量的不确定度。方法分析影响饮用纯净水中铅含量测定的各种影响要素,包括标准溶液、标准溶液稀释过程、原水样的体积、待测水样的体积、标准曲线拟合和测量结果重复性等,并进行定量评定。结果本方法测量的合成不确定度为3.01%,扩展不确定度为6.02%。本方法测量饮用纯净水中铅含量的结果为(5.347±0.322)ng/mL(k=2,置信区间95%)。结论通过对本方法的不确定度评定,掌握引入不确定度的主要因素,降低可控不确定度对实验结果的影响,提高实验结果的准确性。
Objective To assess the uncertainty of determination of lead in drinking pure water by graphite furnace atomic absorption spectrometry. Methods The influential factors affecting the determination of lead in drinking purified water were analyzed, including standard solution, dilution of standard solution, original water sample volume, volume of sample water to be measured, standard curve fitting and repeatability of measurement results, etc. Quantitative assessment. Results The proposed method has a combined uncertainty of 3.01% and an extended uncertainty of 6.02%. The method for measuring lead in drinking pure water resulted in (5.347 ± 0.322) ng / mL (k = 2, 95% confidence interval). Conclusion By evaluating the uncertainty of the method, we can grasp the main factors of introducing uncertainty, reduce the influence of controllable uncertainty on the experimental results, and improve the accuracy of the experimental results.