Measuring Nd(III) Solution Concentration in the Presence of Interfering Er(III) and Cu(II) Ions: A Partial Least Squares Analysis of Ultraviolet–Visible Spectra

Author:

Tse Poki12,Shafer Jenifer1,Bryan Samuel A.1ORCID,Nelson Gilbert L.3,Lines Amanda M.1

Affiliation:

1. Pacific Northwest National Laboratory, Richland, WA 99352, USA

2. Department of Chemistry, Colorado School of Mines, Golden, CO 80401, USA

3. Department of Chemistry, The College of Idaho, Caldwell, ID 83605, USA

Abstract

Optical spectroscopy is a powerful characterization tool with applications ranging from fundamental studies to real-time process monitoring. However, it can be difficult to apply to complex samples that contain interfering analytes which are common in processing streams. Multivariate (chemometric) analysis has been examined for providing selectivity and accuracy to the analysis of optical spectra and expanding its potential applications. Here we will discuss chemometric modeling with an in-depth comparison to more simplistic analysis approaches and outline how chemometric modeling works while exploring the limits on modeling accuracy. Understanding the limitations of the chemometric model can provide better analytical assessment regarding the accuracy and precision of the analytical result. This will be explored in the context of UV–Vis absorbance of neodymium (Nd3+) in the presence of interferents, erbium (Er3+) and copper (Cu2+) under conditions simulating the liquid–liquid extraction approach used to recycle plutonium (Pu) and uranium (U) in used nuclear fuel worldwide. The selected chemometric model, partial least squares regression, accurately quantifies Nd3+ with a low percentage error in the presence of interfering analytes and even under conditions that the training set does not describe.

Funder

U.S. Department of Energy

National Science Foundation

Publisher

SAGE Publications

Subject

Spectroscopy,Instrumentation

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