Uncertainty Evaluation of Determination of Cyanide in Qingxiangxing Baijiu by Spectrophotometry
Objective:To evaluate the uncertainty of cyanide determination in Qingxiangxing Baijiu by spectrophotometry and improve the accuracy of cyanide detection in Baijiu.Method:The determination of cyanide in Qingxiangxing Baijiu was carried out according to the spectrophotometric method in GB 5009.36-2023,and the measurement uncertainty in the determination process was evaluated according to JJF 1059.1-2012.Result:When the cyanide content(measured by HCN)was 1.46 mg·L-1,the expanded uncertainty was 0.15 mg·L-1,and the drawing of the standard curve and the preparation of the standard solution had a significant impact on the measurement results.Conclusion:The preparation of standard solutions should strictly follow standard specifications and use high-precision glass measuring instruments.If necessary,the number of tests for standard series solutions should be appropriately increased to reduce measurement uncertainty and obtain more accurate measurement data.
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