石墨炉原子吸收光谱法测定面粉中镉的不确定度评定

• 作 者: 张小红
• 机 构: 新疆巴音郭楞蒙古自治州巴州疾病预防控制中心,
• 出 处: 医学动物防制
• 发表日期: 2014年08期
• 关键词: 石墨炉原子吸收光谱法 镉 不确定度 评定

目的通过对石墨炉原子吸收光谱法测定面粉中镉含量不确定度进行评定。方法建立数学模型,分析不确定度来源,量化不确定度分量,评定面粉中镉的合成和扩展不确定度。结果不确定度评定结果为(29.0±0.5),k=2。结论分析不确定度的主要来源是由配制标准系列引入相对不确定度。

OBJECTIVE To evaluate the uncertainty of determination of cadmium in flour by graphite furnace atomic absorption spectrometry. Methods The mathematical model was established, the source of uncertainty was analyzed, the components of uncertainty were quantified, and the synthesis and expansion uncertainty of cadmium in flour were evaluated. The results of uncertainty assessment were (29.0 ± 0.5) and k = 2. Conclusions The main source of analysis uncertainty is the introduction of relative uncertainty from the preparation of a standard series.