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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Atomic Emission Spectroscopy: Overview01:20

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Atomic Emission Spectroscopy: Lab01:29

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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Quantitative analysis of uranium in aqueous solutions using a semiconductor laser-based spectroscopic method.

Hye-Ryun Cho1, Euo Chang Jung, Wansik Cha

  • 1Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute, Yuseong-gu, Daejeon 305-600, Republic of Korea.

Analytical Chemistry
|March 29, 2013
PubMed
Summary

This study introduces a simple method to measure hexavalent uranium (U(VI)) in water using luminescence and Raman scattering. The technique offers a low detection limit for accurate uranium concentration analysis.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Spectroscopy

Background:

  • Accurate determination of hexavalent uranium (U(VI)) is crucial for environmental monitoring and nuclear safety.
  • Existing methods for U(VI) quantification can be complex or require specialized equipment.

Purpose of the Study:

  • To develop and validate a simple, simultaneous analytical method for U(VI) determination in aqueous solutions.
  • To establish a cost-effective and sensitive technique for uranium analysis.

Main Methods:

  • Simultaneous measurement of U(VI) luminescence and water Raman scattering using a 405 nm semiconductor laser.
  • Quantitative analysis based on the ratio of U(VI) luminescence intensity (519 nm) to water Raman scattering intensity (469 nm).
  • Method validation using groundwater samples and comparison with established techniques.

Main Results:

  • Achieved a low limit of detection (LOD) in the parts per billion (ppb) range.
  • Established a wide dynamic range for U(VI) quantification, from ppb to hundreds of parts per million (ppm).
  • Demonstrated good agreement between the developed method and conventional techniques like kinetic phosphorescence analysis and ICP-MS for groundwater samples.

Conclusions:

  • The developed luminescence and Raman scattering method provides a simple, sensitive, and accurate approach for U(VI) determination.
  • This technique is suitable for analyzing uranium concentrations in environmental samples, including groundwater.
  • Offers a viable alternative for routine uranium monitoring due to its simplicity and sensitivity.