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相关概念视频

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

1.5K
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...
1.5K
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

144
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...
144
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

359
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
359
Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

310
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.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
310
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

331
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
331
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

1.4K
Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
1.4K

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Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability
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审查 (U) 元素检测方法.

Xiang Yu1,2,3, Xuebin Su2,3, Zhe Wang1

  • 1State Key Laboratory of Power System Operation and Control, Tsinghua-Rio Tinto Joint Research Centre for Resources, Energy and Sustainable Development, International Joint Laboratory on Low Carbon Clean Energy Innovation, Institute for Carbon Neutrality, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China.

Analytical methods : advancing methods and applications
|January 20, 2025
PubMed
概括

精确的探测对于核能和核安全至关重要. 本研究审查了液体,固体和气体样本的方法,为未来的高精度,便携式分析提出了综合技术.

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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability
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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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科学领域:

  • 核化学与工程 核化学与工程
  • 分析化学 分析化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 核能的快速发展需要高效的资源管理和对放射性材料的控制.
  • 对 (U) 的定量检测和定性识别对于资源利用和核安全都至关重要.

研究的目的:

  • 在不同的样本状态 (液体,固体,气体) 和环境中全面审查和分析各种检测方法.
  • 确定当前检测技术的挑战,并提出解决方案,以提高准确性和分辨率.
  • 探索先进技术的应用,如激光诱导分解光谱和X射线光用于分析.

主要方法:

  • 对液态样本检测方法的审查和比较分析.
  • 激光诱导分解光谱 (LIBS) 和X射线光 (XRF) 的应用,用于含的固体样品和粉末压缩.
  • 使用LIBS进行六化物 (UF6) 气体样本的快速,直接的同位素分析.
  • 讨论工业监测的远程和现场检测技术.

主要成果:

  • 总结了各种液体样本检测方法的优缺点.
  • 展示了对固体样本的LIBS和XRF应用,突出了分辨率和准确性的问题.
  • 使用LIBS在没有样本准备的情况下,在UF6气体中实现了快速,直接的U同位素丰度测定.
  • 讨论了用于工业探测的远程和现场技术的潜力.

结论:

  • 目前的检测方法在分辨率和准确性方面存在局限性,特别是在固体样本方面.
  • LIBS提供了一种有前途的方法,用于气态形式的的快速同位素分析.
  • 未来的进步在于将多种检测方法结合起来,以开发用于各种场景的快速,高精度和便携式检测系统.