According to the measurement procedures that silicon content spectrophotometric in aluminum alloy of GB/T 20975. 5-2008, analyzed the main sources of uncertainty, such as the measurement repeatability of all the influencing factors, weighing scales, constant volume, sub volume, working curve was evaluated, calculate the combined uncertainty and expanded uncertainty and confidence interval.%根据GB/T20975. 5-2008对铝合金中硅含量的钼蓝分光光度法测量程序,分析了不确定度的主要来源,对各影响因素如测量的重复性、称量天平、定容体积、分取体积、工作曲线进行了评定,计算出合成不确定度,扩展不确定度和置信区间.
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