Insights into Tetravalent Np Speciation in HNO₃ through Spectroelectrochemistry and Multivariate Analysis.

ABSTRACT: In situ optical spectroscopy, spectropotentiometry, and multivariate analysis were applied to the Np(IV) nitrate system to better understand speciation and quantify HNO₃ concentration. Thin-layer spectropotentiometry, or spectroelectrochemistry, was leveraged to isolate and stabilize Np(IV) without compromising the solution conditions and generate representative Vis-NIR absorption spectra from 0.5 to 10 M HNO₃ and benchmark the corresponding Np(IV) molar absorptivity coefficients. Spectra were described with principal component analysis (PCA) to identify the purest Np(IV) absorbance spectra among other oxidation states [e.g., Np(V/VI)] at each acid concentration and then to identify the primary sources of variance within each Np(IV) spectrum with respect to Np(IV) nit

SUBMITTER: Gilson SE 

PROVIDER: S-EPMC11525743 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature