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Related Concept Videos

Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

289
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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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: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

302
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
302
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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Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

283
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
283
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

221
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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A Straightforward Method for Copper Determination in Fish Samples via Direct Solid Sample Analysis Line-Source GFAAS.

Matheus Fernandes Filgueiras1, Marie Novotná2, Michaela Vašinová Galiová2

  • 1Rio de Janeiro State University, Graduate Program in Chemical Engineering, Rua São Francisco Xavier 524, Rio de Janeiro 20550-013, Brazil.

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Summary

This study presents a simple method for direct copper (Cu) analysis in fish powder using graphite furnace atomic absorption spectrometry. The technique offers reliable and sensitive Cu quantification in solid food samples.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Food Science

Background:

  • Accurate determination of copper (Cu) in food matrices like fish is crucial for nutritional and safety assessments.
  • Traditional methods for elemental analysis often require extensive sample digestion, increasing complexity and potential for error.
  • Direct solid sample analysis offers a more streamlined approach to elemental quantification.

Purpose of the Study:

  • To develop and validate a simple, reliable method for direct copper determination in powdered fish samples.
  • To optimize the graphite furnace atomic absorption spectrometry (GFAAS) parameters for solid sample analysis.
  • To assess the accuracy and sensitivity of the proposed method for quantifying copper in fish tissues.

Main Methods:

  • Direct solid sample analysis using a laboratory-made device with glass capillary tubes for sample handling.
  • Line-source graphite furnace atomic absorption spectrometry (GFAAS) for copper detection.
  • Optimization of pyrolysis (1100 °C) and atomization (2400 °C) temperatures.
  • External calibration using aqueous solutions for quantification.

Main Results:

  • The optimized method achieved high sensitivity with detection and quantification limits of 0.04 ng g⁻¹ and 0.12 ng g⁻¹, respectively.
  • External calibration with aqueous standards provided accurate copper quantification in powdered fish samples.
  • The direct solid sample analysis method proved to be simple, reliable, and effective for copper determination.

Conclusions:

  • The developed direct solid sample analysis method using GFAAS is a viable and efficient technique for copper determination in fish.
  • This approach simplifies sample preparation, making elemental analysis more accessible.
  • The method's reliability and sensitivity support its application in routine food analysis and quality control.