Objective To evaluate the uncertainty of the determination of the nitrite content in meat products by spectrophotometry. Methods Through the establishment of the uncertainty evaluation mathematical model, the main components of uncertainty were analyzed and calculated, and the composite uncertainty and extended uncertainty were obtained. Results When the nitrite content in meat sample was 6.01 mg/kg, its expansion uncertainty was 0.25 mg/kg (95%, k=2). The results showed that the uncertainty of determination of nitrite in meat products by spectrophotometry was mainly due to the process of preparing standard curves, especially the process of color liquid setting capacity of standard curves. The uncertainty caused by sample weighing and solution setting capacity is not important. Conclusion This study can be used as a reference for the uncertainty evaluation for the determination of nitrite content in meat products by spectrophotometry.
标题：分光光度法测定肉制品中亚硝酸盐含量的不确定度评定
英文标题：Evaluation of uncertainty in determination of the nitrite content in meat products by spectrophotometry
