Remote sensing of Pu in uranyl nitrate crystals using reflectance spectroscopy and chemometrics.

ABSTRACT: Remote quantification of Pu(vi) (0-5 mol%) co-crystallized with U in uranyl nitrate hexahydrate (UNH) crystals was achieved in a glove box using reflectance spectroscopy coupled with chemometric modeling. Reflectance spectra were also acquired for Pu(iv) and Np(vi) (0-5 mol%) crystallized with UNH; revealing spectral features consistent with their solution-phase analogs. Principal component analysis revealed Pu(iv/vi) and Np(vi) concentrations as the primary source of variation in the data, informing the development of a supervised partial least squares regression model for Pu(vi). The resulting calibration demonstrated robust performance, with replicate root mean square errors near 10% and quantifiable limits near 0.2 mol% Pu(vi) relative to U. The Pu(vi) remained stable in the crystallin

SUBMITTER: Sadergaski LR 

PROVIDER: S-EPMC12687128 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature