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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

Molecular Spectroscopy: Absorption and Emission

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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...
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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.
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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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...
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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
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Updated: Feb 13, 2026

Biological Samples Preparation for Speciation at Cryogenic Temperature using High-Resolution X-Ray Absorption Spectroscopy
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Enabling liquid solvent structure analysis using hard x-ray absorption spectroscopy with a transferrable microfluidic

Jian Zheng1, Wei Zhang2, Feng Wang2

  • 1Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 22, 2018
PubMed
Summary

This study integrates microfluidic devices with hard x-ray absorption spectroscopy to analyze potassium ferricyanide solutions. Results show concentration does not affect the iron complex structure, demonstrating a viable method for liquid analysis at synchrotrons.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Studying liquid samples at interfaces requires specialized techniques.
  • Hard x-ray absorption spectroscopy (HXAS) probes local atomic structure.
  • Microfluidic devices offer precise sample handling.

Purpose of the Study:

  • To investigate the local structure of potassium ferricyanide (K3[Fe(CN)6]) in aqueous solutions using HXAS.
  • To evaluate the integration of a vacuum-compatible microfluidic system with HXAS.
  • To assess the influence of varying concentrations on the K3[Fe(CN)6] structure.

Main Methods:

  • A vacuum-compatible microfluidic device was developed for liquid sample analysis.
  • The microfluidic system was coupled with hard x-ray absorption spectroscopy.
  • Fe K-edge HXAS spectra were collected for K3[Fe(CN)6] solutions at 0.5 M, 0.05 M, and 0.005 M.

Main Results:

  • HXAS confirmed the presence of Fe(III) in an octahedral geometry within the aqueous solutions.
  • The first coordination shell showed Fe-C bond distances of approximately 1.92 Å.
  • The second coordination shell indicated Fe-N distances around 3.10 Å, independent of concentration.

Conclusions:

  • The local structure of K3[Fe(CN)6] in water is stable across tested concentrations.
  • Microfluidic devices are feasible for liquid analysis in synchrotron facilities.
  • Portable microfluidic reactors enable advanced liquid measurements.