土壤中三氧化二铝测定结果的不确定度评定

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

摘要: 讨论了影响三氧化二铝测定结果不确定度的各种因素，并评定了土壤样品中测定三氧化二铝结果的不确定度。采用EDTA络合、氟化钾置换、乙酸锌溶液滴定的测定方法，当三氧化二铝的含量为15.03%时，其扩展不确定度U=0.20%（Urel=1.4%，k=2）。

Abstract: 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).