摘要：利用电感耦合等离子体发射光谱（ICP-OES）法测定纳米氧化铝中Fe元素的含量，建立对应的数学模型。对试样秤量、溶液定容、标准溶液浓度、仪器测定误差、标准工作曲线回归等因素引入的不确定度分量进行分析与评定，并采用模型中Fe含量关于各变量的偏导数作为灵敏度系数计算合成不确定度。结果表明，当纳米氧化铝中Fe含量为553.4mg/kg时，其标准合成不确定度为18.1mg/kg，扩展不确定度为36.2mg/kg。可见，纳米氧化铝中Fe元素的含量测定的不确定度主要来自于仪器测定误差、标准工作曲线回归、移液器的量值误差和标准储备溶液的Fe浓度误差。
关键词： ICP-OES,
纳米氧化铝, 不确定度, 偏导数, 灵敏度系数
Abstract: A mathematical model was
established for determination of Fe in nano aluminum oxide by Inductive Coupled
Plasma Optical Emission Spectrometry(ICP-OES). Uncertainty induced by factors
including sample weighting, solution volume determination, standard solution
concentration, instrument measuring error, standard working curve regression,
etc. were analyzed and evaluated, and the partial derivatives of Fe in sample
with respective to all variables in the model were applied as sensitivity
coefficients in obtaining of composite uncertainties. The result showed that
the standard composite uncertainty was 18.1mg/kg and the extended uncertainty
was 36.2mg/kg when Fe in sample was 553.4mg/kg. It could been concluded that the
uncertainty of Fe in nano aluminum oxide was mainly resulted from instrument
measuring error, standard working curve regression, pipette measuring error and
Fe concentration error of standard stock solution.
Key words: ICP-OES, nano aluminum oxide,
uncertainty, partial derivatives, sensitivity coefficients.
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