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Related Concept Videos

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Quantifying Dense Multicomponent Slurries with In-Line ATR-FTIR and Raman Spectroscopies: A Hanford Case Study.

Rupanjali Prasad1, Steven H Crouse1, Ronald W Rousseau1

  • 1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

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|October 9, 2023
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Summary
This summary is machine-generated.

Raman and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy offer safer, faster in-line analysis of nuclear waste slurries. These methods provide crucial compositional data for effective waste processing and disposal.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nuclear Waste Management

Background:

  • Nuclear waste slurries, like those at Hanford, are complex, multiphase mixtures.
  • Current lab-based analysis is slow and poses risks to workers.
  • Real-time, in-line monitoring is needed for efficient processing.

Purpose of the Study:

  • To evaluate Raman and ATR-FTIR spectroscopy for analyzing nuclear waste slurry simulants.
  • To determine the effectiveness of each technique for solution and solid phase analysis.
  • To establish in-line spectroscopic methods as a viable alternative to traditional lab analysis.

Main Methods:

  • Testing Raman spectroscopy on slurry simulants.
  • Testing attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy on slurry simulants.
  • Analyzing slurries with up to 23.2 wt % solids.

Main Results:

  • ATR-FTIR spectroscopy accurately measured the solution phase (3.52% mean error).
  • Raman spectroscopy provided information on suspended solids (18.21% mean error).
  • In-line measurement of multicomponent solids in nuclear waste was previously unreported.

Conclusions:

  • Both Raman and ATR-FTIR spectroscopy are effective for in-line analysis of nuclear waste slurries.
  • These spectroscopic methods offer a safer and faster alternative for compositional analysis.
  • Accurate compositional data is vital for stable glass formulation and nuclear waste disposal.