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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

269
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
269
pH Scale02:41

pH Scale

67.7K
Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means...
67.7K
Indicators02:39

Indicators

47.7K
Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a...
47.7K

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Real-Time Automated pH Control within Batch Processes Relying on Raman pH Measurement.

Thomas Serrano1, Alyssa F Espley1, Savannah M Potter1

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Summary
This summary is machine-generated.

Raman spectroscopy offers a robust method for real-time pH monitoring in nuclear fuel recycling. This durable technique, coupled with chemometrics, optimizes separation processes by maintaining precise pH levels, outperforming traditional probes.

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Area of Science:

  • Nuclear chemistry and materials science
  • Analytical chemistry
  • Process control engineering

Background:

  • Nuclear fission provides low-carbon energy but requires effective management of used nuclear fuel.
  • Recycling valuable components from used fuel necessitates chemical processing sensitive to solution pH.
  • Traditional pH probes are unsuitable for harsh nuclear fuel processing environments.

Purpose of the Study:

  • To demonstrate Raman spectroscopy as a robust, real-time pH monitoring tool for nuclear fuel reprocessing.
  • To integrate Raman spectroscopy with chemometrics and industrial control systems for automated pH management.
  • To optimize the TALSPEAK extraction process by maintaining a critical pH range.

Main Methods:

  • Utilized Raman spectroscopy for in-situ, real-time pH monitoring of solutions.
  • Employed chemometric analysis to develop a predictive pH model.
  • Integrated spectroscopy and modeling with Programmable Logic Controllers for automated process control.
  • Perturbed solutions and observed the system's ability to automatically return to the target pH.

Main Results:

  • Raman spectroscopy accurately tracked and predicted pH in carboxylate-buffered systems.
  • The automated control system successfully maintained solution pH within the optimal range (2.8 ± 0.1) for TALSPEAK extraction.
  • Raman-based pH measurements showed favorable agreement with electrochemical probes.
  • Root-mean-square errors confirmed the reliability of Raman spectroscopy for automated pH correction.

Conclusions:

  • Raman spectroscopy, enhanced by chemometrics, provides a durable and accurate alternative to traditional pH probes for nuclear fuel processing.
  • This integrated approach enables real-time control and optimization of critical chemical separations.
  • The technology demonstrates pragmatic application for improving efficiency and safety in used nuclear fuel management.