石墨炉原子吸收分光光度法测定自制阳性猪肉中铅的不确定度评定

Uncertainty analysis of plumbum determination for homemade positive pork by graphite furnace atomic absorption spectrometry

中文关键词:  原子吸收分光光度法  自制阳性猪肉  铅  不确定度

英文关键词:graphite furnace atomic absorption spectrometry  homemade positive pork  plumbum  uncertainty

中文摘要:

      目的 评估用石墨炉原子吸收分光光度法测定自制阳性猪肉中铅的不确定度, 以找出影响不确定度的因素, 为评价检验结果提供科学依据。方法 建立猪肉中铅含量不确定度的数学模型, 分析不确定度来源, 并进行不确定度的评定。结果 自制阳性猪肉中铅的含量为0.236 mg/kg, 扩展不确定度为0.026 mg/kg(包含因子k=2), 影响不确定度的主要因素是标准曲线线性拟合和分析仪器。结论 可通过控制标准曲线校准过程和加强对分析仪器的保养维护, 来降低石墨炉原子吸收分光光度法测定猪肉中铅含量的不确定度。

英文摘要:

      Objective To analyze the uncertainty in the determination of plumbum in homemade positive pork by graphite furnace atomic absorption spectrometry to provide the evidence for the measurement evaluation. Methods Graphite furnace atomic absorption spectrometry was used to determine the content of plumbum in pork. The determination process was analyzed to identify the source of uncertainty and the combined uncertainty was calculated．Results The content of plumbum in homemade positive pork was 0.236 mg/kg, and the expanded uncertainty was 0.026 mg/kg (k=2). The main factors of the uncertainty were standard curve linear fitting and analytical instruments. Conclusion The control of preparation of standard curve and the maintenance of analytical instruments can reduce the uncertainty of plumbum content in pork by graphite furnace atomic absorption spectrometry.