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相关概念视频

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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...
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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...
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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...
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在批处理过程中实时自动化pH控制,依靠拉曼pH测量.

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概括

拉曼光谱为核燃料回收中的实时pH监测提供了一种可靠的方法. 这种持久的技术,加上化学测量,通过保持精确的pH值水平来优化分离过程,优于传统探针.

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科学领域:

  • 核化学和材料科学 核化学和材料科学
  • 分析化学是一种分析化学.
  • 工艺控制工程 工艺控制工程

背景情况:

  • 核裂变提供低碳能源,但需要有效管理使用的核燃料.
  • 从使用过的燃料中回收有价值的组件需要对溶液pH敏感的化学处理.
  • 传统的pH探头不适合在恶劣的核燃料加工环境中使用.

研究的目的:

  • 为了证明拉曼光谱作为核燃料再加工的强大,实时pH监测工具.
  • 将拉曼光谱与化学测量和工业控制系统集成为自动化pH管理.
  • 通过保持关键的pH值范围来优化TALSPEAK提取过程.

主要方法:

  • 利用拉曼光谱技术在现场实时监测溶液的pH值.
  • 采用化学测量分析来开发一个可预测的pH模型.
  • 集成光谱和建模与可编程逻辑控制器用于自动化过程控制.
  • 扰乱了溶液,并观察到系统自动恢复到目标pH值的能力.

主要成果:

  • 拉曼光谱学准确地跟踪和预测碳酸盐缓冲系统中的pH值.
  • 自动控制系统成功地使溶液的pH值保持在TALSPEAK提取的最佳范围 (2.8 ± 0.1) 内.
  • 基于拉曼的pH测量显示出与电化学探针的良好一致.
  • 平方根误差证实了拉曼光谱在自动pH校正方面的可靠性.

结论:

  • 拉曼光谱,通过化学测量增强,为核燃料加工的传统pH探针提供了耐用和准确的替代方案.
  • 这种综合方法可以实时控制和优化关键化学分离.
  • 该技术展示了用于提高废核燃料管理效率和安全的务实应用.