In this paper,the whole process of determination of sodium nitrite in food was analyzed by ultraviolet spectrophotometer,and the uncertainty of the method was evaluated.By analyzing the various factors affecting the determination of nitrite content in food during the whole process of the experiment,including weighing,constant volume,dilution of standard solution,standard curve fitting and repeatability of measurement,the main reasons affecting the uncertainty of measurement results during the experiment were identified and evaluated.The results showed that the nitrite content in food was(1.000±0.133)mg·kg-1.
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