【摘要】 采用Top-down控制图法对石墨炉原子吸收光谱法(graphite furnace atomic absorption spectrometry, GFAAS)测定大虾成分分析标准物质中镉进行不确定度评定。按照GB 5009.15—2014《食品安全国家标准食品中镉的测定》的检测方法，使用大虾成分分析标准物质GBW10050,对镉含量进行测定，基于Top-down控制图法对积累数据进行检验和分析。表明测量结果符合正态性和独立性假设，控制图分析表明测量系统处于统计受控状态，GBW10050中镉含量的不确定结果为0.001 8 mg/kg。Top-down控制图法可准确反映实验室在期间精密度测量条件下的测量水平，对于已经确定测量不确定度来源的实验室，推荐采用Top-down控制图法进行实验室质控水平的长期评定。[中国渔业质量与标准，2022,12(3):39-44]更多还原

【Abstract】 The uncertainty evaluation for determination of cadmium in standard reference material of shrimp were carried out by graphite furnace atomic absorption spectrometry(GFAAS) with Top-down control chart method. According to GB 5009.15—2014, the content of cadmium in standard reference material of shrimp(GBW10050) was determined, and the accumulated data were tested and analyzed based on Top-down control chart method. The results conformed to the assumption of independence and normal distribution. The control chart showed that the measurement system was under statistical control state, and the uncertainty of cadmium in GBW10050 was 0.0018 mg/kg. The top-down control chart method could accurately reflect the laboratory measurement level under intermediate precision condition. As for the laboratory that has identified the source of measurement uncertainty, it is recommended to use Top-down control chart method for long-term evaluation of laboratory quality control level. [Chinese Fishery Quality and Standards, 2022, 12(3): 39-44]更多还原