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相关概念视频

Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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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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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...
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Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Flame Photometry: Overview01:02

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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相关实验视频

Updated: Jul 24, 2025

Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants
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使用激光诱导光的辅助LIBS在土壤中的量化.

Shweta Soni1,2, Jan Viljanen1, Risto Uusitalo3

  • 1Photonics Laboratory, Physics Unit, Tampere University, FI-33101, Tampere, Finland.

Heliyon
|July 6, 2023
PubMed
概括

准确地监测土壤对于农业和防止肥沃化至关重要. 激光诱导的光分解光谱 (LIBS-LIF) 为可溶提供了更好的检测极限,减少了实验室的工作.

关键词:
诊断 诊断 诊断 诊断光是一种光效应.在LIBS中,LIBS是指LIBS.是一种的物质.土壤 土壤土壤.

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Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil
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科学领域:

  • 农业科学 农业科学
  • 分析化学 分析化学
  • 环境科学 环境科学

背景情况:

  • 测量土壤对于可持续的农业和防止水缩至关重要.
  • 缺乏会对作物发展和生长产生负面影响.
  • 精确地监测土壤是最佳农业实践的必要条件.

研究的目的:

  • 引入激光诱导分解光谱技术,辅助激光诱导光 (LIBS-LIF),用于量化土壤中容易溶解的.
  • 为了比较LIBS-LIF的分析性能与传统的激光诱导分解光谱 (LIBS) 方法.
  • 评估不同类型土壤中可溶的检测极限和高通量分析的潜力.

主要方法:

  • 利用激光诱导的分解光谱学辅助激光诱导光 (LIBS-LIF) 进行土壤分析.
  • 采用不同含量的矿物土壤用于方法开发和验证.
  • 生成校准曲线以确定可溶的检测极限.

主要成果:

  • 与传统的LIBS相比,LIBS-LIF显著提高了可溶的检测极限.
  • 粘土土的LIBS-LIF检测极限为0.12 mg/kg,泥土的粘土/泥土为0.27 mg/kg.
  • 使用LIBS-LIF实现的检测极限与已建立的化学土壤分析相当.

结论:

  • LIBS-LIF提供了一种更敏感的方法来量化可溶性土壤.
  • 与传统方法相比,这种技术大大减少了样本准备和实验室工作量.
  • LIBS-LIF显示了高通量土壤分析的潜力,在特定土壤类型内进行校准.