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Fast batch injection analysis of H(2)O(2) using an array of Pt-modified gold microelectrodes obtained from split
Bruno D Pacheco1, Jaqueline Valério, Lúcio Angnes
1Centro de Ciências e Humanidades - Universidade Presbiteriana Mackenzie, São Paulo, SP, Brazil.
Analytica Chimica Acta
|May 31, 2011
Summary
A new amperometric method using platinum-modified gold microelectrodes enables fast and reliable hydrogen peroxide (H2O2) detection. This batch injection analysis (BIA) technique offers high analytical frequency and accuracy for environmental samples.
Area of Science:
- Electrochemistry
- Analytical Chemistry
- Materials Science
Background:
- Hydrogen peroxide (H2O2) is a key analyte in various chemical and biological processes.
- Accurate and rapid H2O2 determination is crucial for environmental monitoring and industrial applications.
- Existing analytical methods may lack the speed, robustness, or sensitivity required for certain applications.
Purpose of the Study:
- To develop a fast and robust analytical method for the amperometric determination of hydrogen peroxide (H2O2).
- To utilize an array of gold microelectrodes modified with platinum for enhanced sensitivity and stability.
- To adapt surface-mounted device (SMD) technology for microelectrode fabrication suitable for batch injection analysis (BIA).
Main Methods:
- Batch injection analysis (BIA) employing an array of 14 gold microelectrodes modified with platinum.
- Optimization of dispensing rate, injected volume, electrode-to-tip distance, and cell volume.
- Differential mode detection with selective H2O2 destruction using catalase for enhanced selectivity.
- Amperometric detection for quantifying H2O2 concentration.
Main Results:
- The method accurately determines H2O2 in the concentration range of 0.8 to 100 μmolL⁻¹.
- Achieved an analytical frequency of up to 300 determinations per hour.
- Demonstrated excellent precision with a relative standard deviation (RSD) <0.9% for successive injections.
- Established a detection limit of 0.34 μmolL⁻¹ (3σ).
- Validated the method for H2O2 determination in rainwater samples from São Paulo City.
Conclusions:
- The proposed BIA method provides a fast, robust, and sensitive approach for H2O2 amperometric determination.
- The use of platinum-modified gold microelectrodes derived from SMD technology offers practical advantages.
- The method exhibits good selectivity and precision, suitable for real-world sample analysis.
- The results show good agreement with established flow injection analysis (FIA) spectrophotometric methods.
