An ICP-OES Method with 0.2% Expanded Uncertainties for the Characterization of LiAlO_2

摘要

An improved inductively coupled plasma-optical emission specirometry (ICP-OES) method’ has been applied to the determination of U and Al mass fractions and the U/Al amount-of-substance ratio in representative samples of hAlO2. This ICP-OES method has uncertainty on the order of 0.2%,2,3 comparable to the best analytical meth-ods. This method is based on several strategies, which are detailed in this work. The mean measured mass fractions of U and Al in eight samples were 010151 ±0.00016 (+0.16%) and 0A1068 + 0.00056 (+0.14%), and the mean U/Al amount-of-substance ratio was 0.9793 + 0.0017 (±0.17%). The uncertainty is dominated by sample handling and heterogeneity—about a factor of 2 larger than the ICP-OES instrumental uncertainties, which were 0.04% for Al and 0.07% for U.