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Near-Real-Time Material Tracking: Combining Vis-NIR Spectroscopy with Flow Sensing for Accurate Nd(III)

Sawyer B Irvine¹, Luke R Sadergaski¹, Cannon Giglio¹

¹Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37830, United States.

|April 27, 2026

Summary

This summary is machine-generated.

A new system uses fiber-optic spectroscopy and flow sensors to track neodymium (Nd) mass in real-time during chemical separations. This method improves monitoring for strategic material production.

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Area of Science:

Analytical Chemistry
Spectroscopy
Chemical Engineering

Background:

Accurate monitoring of strategic materials like neodymium (Nd) is crucial for production processes.
Traditional methods for tracking Nd mass can be time-consuming and lack real-time capabilities.
Advanced sensor technologies are needed to improve efficiency and safety in chemical separations.

Purpose of the Study:

To develop and validate a near-real-time system for tracking neodymium mass in effluent streams.
To integrate visible-near-infrared (vis-NIR) absorption spectroscopy with a flow sensor for continuous monitoring.
To establish a robust method for calculating instantaneous and total Nd mass processed.

Main Methods:

A fiber-optic vis-NIR absorption spectroscopy system was coupled with an in-line flow sensor.
A partial least-squares regression (PLSR) model was trained using vis-NIR spectra of Nd-(III) in nitric acid.
Data streams were synchronized to combine volumetric flow rate with predicted Nd molarities for mass calculation.

Main Results:

The integrated system achieved near-real-time tracking of Nd mass.
The PLSR model accurately predicted Nd-(III) molarities based on vis-NIR spectra.
Synchronized data allowed for precise calculation of instantaneous and cumulative Nd mass.

Conclusions:

The developed system provides critical technical infrastructure for enhanced monitoring in chemical separations.
This methodology supports improved process control and the production of strategic materials and isotopes.
The integration of spectroscopy and flow sensing offers a novel approach for real-time elemental mass tracking.