Uncertainty Analysis for Determination of Indium in Water Through Graphite Furnace Atomic Absorption Spectrometry
Indium is an environmental pollutant.Its compounds have carcinogenic effects and biological toxicity,making it an important indicator for water quality monitoring.In order to determine the main sources of uncertainty in the detection process,truthfully reflect the confidence and accuracy of measurement data,and improve the quality of detection,the uncertainty in the determination of indium in water through the graphite furnace atomic absorption spectrophotometry was analyzed and evaluated.A mathematical model was established based on the evaluation criteria for uncertainty and the principle of graphite furnace atomic absorption spectrophotometry for the determination of indium in water.The sources of uncertainty,including repeatability,standard stock solution,standard curve preparation,standard curve fitting,measurement instruments,and sample pretreatment were analyzed,and components of uncertainty,synthetic standard uncertainty,and expanded uncertainty were calculated.The results indicated that the average value of indium in water is 19 µg/L,the extended uncertainty was 5.6％,and the result of indium content in water was 19±2 μg/L,k=2.After evaluation and analysis,the factors affecting indium uncertainty in water were the repetitive processing of samples and the preparation of standard solution.
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