原子吸收分光光度法测定土壤中钒的不确定度评定

Evaluation of Uncertainty in the Determination of Vanadium in Soil by Atomic Absorption Spectrophotometry

采用微波消解、石墨炉原子吸收分光光度法测定土壤中的钒元素,建立了相应的不确定度数学模型,深入分析了各不确定度分量来源,对各分量评定后计算得出合成不确定度、扩展不确定度。结果表明:石墨炉原子吸收分光光度法测定钒元素的不确定度主要来源于校准曲线的拟合和样品重复性测定过程,其次是标准溶液配制。

Microwave digestion and graphite furnace atomic absorption spectrophotometry were used to determine vanadium in soil.The corresponding mathematical model of uncertainty was established.The sources of each uncertainty component were analyzed in depth.The combined uncertainty and expanded uncertainty were calculated after the evaluation of each component.The results show that the uncertainty of the determination of vanadium by graphite furnace atomic absorption spectrophotometry mainly comes from the fitting of the calibration curve and the repeatability of the sample,followed by the preparation of standard solution.