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Precise Electrochemical Sizing of Individual Electro-Inactive Particles
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Beyond equations: Experimental insights into detection limits in electroanalysis.

Jian F S Pereira1, Mauro Bertotti2, Elisama V Dos Santos3

  • 1Department of Fundamental Chemistry, Institute of Chemistry - University of São Paulo, São Paulo, SP, Brazil; Renewable Energies and Environmental Sustainability Research Group, Institute of Chemistry, Federal University of Rio Grande do Norte, Campus Universitário, Natal, RN, Brazil.

Talanta
|June 8, 2026
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Summary
This summary is machine-generated.

Theoretical calculations for the limit of detection (LOD) often differ significantly from experimental values in electroanalysis. This study reveals common errors in LOD calculations and proposes a more reliable experimental framework for accurate sensitivity determination.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry

Background:

  • The limit of detection (LOD) is crucial for quantifying analytes.
  • Theoretical LOD estimations frequently diverge from experimental results.
  • Accurate LOD determination is vital for reliable electroanalytical methods.

Purpose of the Study:

  • To critically examine discrepancies between theoretical and experimental LOD values.
  • To identify common errors in LOD calculations in electroanalytical literature.
  • To propose an improved experimental framework for LOD determination.

Main Methods:

  • Applied square-wave voltammetry (SWV) and differential pulse voltammetry (DPV).
  • Utilized blank signal statistics, error propagation, and graphical methods for LOD calculation.
  • Investigated the [Fe(CN)6]3-/4- system at a gold electrode.

Main Results:

  • Commonly used LOD equations showed discrepancies up to an order of magnitude compared to experiments.
  • Identified frequent misinterpretation of LOD and limit of quantification (LOQ) in literature.
  • Revealed gold electrode participation in the redox system, affecting signal stability.

Conclusions:

  • Theoretical LOD calculations can be unreliable for electroanalytical methods.
  • A statistically rigorous experimental framework is proposed for accurate LOD determination.
  • Improved LOD determination enhances the reliability of electroanalytical techniques for practical applications.