分光光度法测定清香型白酒中氰化物的不确定度评定

Uncertainty Evaluation of Determination of Cyanide in Qingxiangxing Baijiu by Spectrophotometry

目的:通过评定分光光度法测定清香型白酒中氰化物的不确定度,提高检测白酒中氰化物的准确度。方法:参照GB 5009.36—2023中分光光度法进行清香型白酒中氰化物测定,依据JJF 1059.1—2012对测定过程中的测量不确定度进行评定。结果:当氰化物含量(以HCN计)为1.46 mg·L^(-1)时,扩展不确定度为0.15 mg·L^(-1),标准曲线绘制与标准溶液配制对测量结果影响较大。结论:标准溶液配制要严格按照标准规范、使用高精度的玻璃量器,必要时适当增加标准系列溶液的测试次数,以降低测量不确定度,获得更为准确的测量数据。

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.