石墨炉法测量矿泉水中总铬不确定度的评估
目的 评估石墨炉法测量矿泉水中总铬过程的不确定度。方法 根据GB 8538-2016测量矿泉水中石墨炉法测定水中总铬的测定方法, 建立不确定度分析数学模型, 找出可能引入不确定度的来源的所有分量, 并对找出的所有分量进行分析计算和评定, 计算出合成不确定的大小和扩展不确定度的大小。结果 矿泉水样中总铬的含量为(0.37±0.08) ng/mL, k=2。本文讨论的不确定度来源于总铬标准溶液、溶液稀释配制过程引入、仪器测量性能引入、和标准曲线的线性回归方程引入的, 其中标准曲线方程引入的相对标准不确定度μrel(X)=0.106, 合成相对标准不确定度μrel(C)=0.107。结论 本研究中不确定度的主要来源是标准曲线的线性回归方程引入的不确定度。
Objective To evaluate the uncertainty of measuring total chromium in mineral water by graphite furnace method. Methods According to GB 8538-2016, the determination method of total chromium in water by graphite furnace method in mineral water was measured. The mathematical model of uncertainty analysis was established. All the components of the source that may introduce uncertainty were found, and all the components were found. The analysis calculation and evaluation were carried out, and the size of the synthetic uncertainty and the magnitude of the extended uncertainty were calculated. Results The uncertainty was 0.37±0.08 ng/mL k=2. The uncertainty discussed in this paper is derived from the total chromium standard solution, the introduction of the solution dilution preparation process, the introduction of instrument measurement performance, and the linear regression equation introduced by the standard curve. The relative standard uncertainty μrel(X)=0.106 introduced by the standard curve equation and the relative standard uncertainty μrel(C)=0.107. Conclusion The main source of uncertainty in this paper is the uncertainty that introduced by linear regression equation of standard curve.
标题：石墨炉法测量矿泉水中总铬不确定度的评估
英文标题：Evaluation of uncertainty for total chromium in mineral water measured by graphite furnace atomic absorption
作者：
徐慧 辽阳市食品检验检测所
朱禹澎 辽阳市食品检验检测所
孙晓阳 辽阳市食品检验检测所
宋奇繁 重庆医药高等专科学校
中文关键词:总铬,石墨炉法,矿泉水,不确定度,
英文关键词:total chromium,graphite furnace atomic absorption,mineral water,uncertainty,
发表日期：2019-01-25
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