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Related Concept Videos

Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Molecular Spectroscopy: Absorption and Emission01:14

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

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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...
3.5K
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

1.1K
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...
1.1K
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

2.7K
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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Gold Nanoparticle Modified Carbon Fiber Microelectrodes for Enhanced Neurochemical Detection
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Toward In Situ Monitoring of the Precipitation of Gold Nanoparticles Using In-Fiber Absorption Spectroscopy.

Florian Schorn1,2, Markus Binder3, Cornelia Damm3

  • 1Interdisziplinäres Zentrum für Nano-strukturierte Filme, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 1, 91058 Erlangen, Germany.

Analytical Chemistry
|January 27, 2026
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Summary

Hollow-core photonic crystal fibers offer a novel approach to operando spectrometry for chemical reactions. This fiber absorption spectroscopy technique enables higher resolution measurements for processes like gold nanoparticle synthesis.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Operando spectrometry is crucial for monitoring chemical reactions in real-time.
  • Conventional methods using cuvettes have limitations in path length and sample volume.
  • Hollow-core photonic crystal fibers (HCPCFs) present an emerging technology for enhanced spectroscopic analysis.

Purpose of the Study:

  • To explore the application of HCPCFs in operando spectrometry for chemical reaction monitoring.
  • To investigate the advantages of HCPCFs, such as increased path length and reduced volume, for spectroscopic measurements.
  • To apply fiber absorption spectroscopy using HCPCFs to the synthesis of gold nanoparticles.

Main Methods:

  • Fiber absorption spectroscopy utilizing hollow-core photonic crystal fibers.
  • Monitoring the synthesis of gold nanoparticles.
  • Varying initial concentrations of reactants to study reaction kinetics.

Main Results:

  • Demonstrated the feasibility of using HCPCFs for operando spectrometry.
  • Successfully measured the rate of gold nanoparticle formation at different initial concentrations.
  • Achieved significantly higher resolution compared to conventional cuvette-based techniques.

Conclusions:

  • Hollow-core photonic crystal fibers are a promising technology for advanced operando spectrometry.
  • This technique offers superior resolution and efficiency for studying chemical synthesis, exemplified by gold nanoparticle formation.
  • HCPCFs provide a valuable alternative to conventional spectroscopic methods for real-time chemical analysis.