Uncertainty Evaluation for the Determination Results of Aluminum Oxide in Soil Samples

The impacting factors on the uncertainty in measurement results of Al2O3in soil samples were discussed and the uncertainty was evaluated. EDTA complexKI replacemenZn(Ac)2titration method was used for sample pretreatment and determination of Al2O3in soil samples. When concentration of Al2O3is 15.03%, the expanded uncertainty is 0.20% (Urel=1.4%，k=2).