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