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Related Concept Videos

Sample Preparation for Analysis: Advanced Techniques01:08

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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.
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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.
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Determination of selenium using different techniques.

S Vinter1, J Filip1, J Sotolarova2

  • 1Department of Environmental Protection Engineering, Tomas Bata University in Zlin, Faculty of Technology, Vavreckova 275, 760 01, Zlin, Czech Republic.

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|November 20, 2025
PubMed
Summary
This summary is machine-generated.

Voltammetry offers a cost-effective method for selenium speciation, providing higher sensitivity than atomic absorption spectroscopy for detecting selenium species. This technique is valuable for analyzing selenium in complex samples.

Keywords:
Atomic absorption spectrometryLeaching testsSeleniumVoltammetry

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Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Voltammetric methods offer a cost-effective alternative to spectroscopic techniques for selenium determination.
  • Atomic absorption spectroscopy (AAS) typically measures total selenium, while voltammetry can determine specific selenium species like Se(IV).
  • Combining AAS and voltammetry enables comprehensive selenium speciation analysis.

Purpose of the Study:

  • To compare the analytical performance of Flame Atomic Absorption Spectroscopy (FAAS) and Graphite Furnace Atomic Absorption Spectroscopy (GFAAS) with anodic stripping square wave voltammetry (ASSWV).
  • To evaluate the effectiveness of unmodified glassy carbon electrodes (GCE) and pencil graphite electrodes for selenium speciation.
  • To determine individual selenium species (Se(IV), Se(VI)) in model solutions and real samples.

Main Methods:

  • Comparison of FAAS, GFAAS, and ASSWV techniques.
  • Utilized unmodified glassy carbon electrode (GCE) and pencil graphite electrode for voltammetry.
  • Quantification of Se(IV), Se(VI), and Se(0) using stock solutions and model samples.

Main Results:

  • GFAAS exhibited the lowest detection limit (5.2 μg/L), followed by ASSWV (0.57 mg/L Se(IV)) and FAAS (0.896 mg/L).
  • ASSWV with GCE showed linear calibration for Se(IV) in the 1.2-9.7 mg/L range.
  • FAAS was more reliable for total selenium determination in hazardous waste leachates (33-37 mg/L), while voltammetry quantified Se(IV) at 4.9-6 mg/L (14.9-17% of total Se).

Conclusions:

  • Voltammetry is a viable and selective method for selenium speciation in complex matrices, complementing spectroscopic methods.
  • Graphite-based electrodes offer higher sensitivity for selenium determination but require geometric stability.
  • The study demonstrated the utility of combining spectroscopic and voltammetric techniques for accurate selenium speciation.