采用市场上常见的液体包装用聚乙烯乳白单膜，实现了以65%乙醇为浸泡液，蒸发残渣测量不确定度的评定。通过实验与不确定度的影响因素分析，建立了蒸发残渣不确定度的数学模型，计算了各不确定度分量。实验结果表明：扩展不确定度为1.22 mg/L（k=2），蒸发残渣的测定结果为(7.0±1.22) mg/L。

The uncertainty of evaporation residue determination was evaluated using polyethylene white film for packaging of liquids on the market and 65% alcohol as soaking solution. Influencing factors of uncertainty were analyzed by experimental methods. Mathematical model of uncertainty of evaporation residue was established and all sorts of uncertainty components were calculated. The experimental results showed that the expanded uncertainty was 1.22 mg/L(k=2) and the result of determination of evaporation residue was (7.0±1.22) mg/L.