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目的计算出血镉测定值的不确定度与影响不确定度的因素。方法依据JJF059-1999《测量不确定度评定与表达》原理和方法计算血镉测定值合成标准不确定度。结果血镉含量X=(22.60±0.14)μg/L。其不确定度主要包括:①检测仪器的相对不确定度;②标准溶液的浓度;③样品浓度;④标准溶液稀释量具;⑤样品稀释量具;⑥有效数字修约。结论全面反映检测过程各方面的不确定度是质量控制的关键。
Objective To calculate the uncertainty of the determination of blood cadmium and the factors that affect the uncertainty. Methods According to the principle and method of JJF059-1999 “Evaluation and Expression of Uncertainty in Measurement”, the standard uncertainty of the determination of blood and cadmium was calculated. Results Blood cadmium X = (22.60 ± 0.14) μg / L. The uncertainty include: ① Relative uncertainty of testing equipment; ② Concentration of standard solution; ③ Sample concentration; ④ Standard solution dilution; ⑤ Sample dilution; ⑥ Effective number rounding. Conclusion The key to quality control is to fully reflect the uncertainty of all aspects of the testing process.