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Published on: May 10, 2021
On-line bi-directional electrostacking for As speciation/preconcentration using electrothermal atomic absorption
Luciana M Coelho1, Nívia M M Coelho, Marco A Z Arruda
1Universidade Estadual de Campinas, Instituto de Química, Cidade Universitária Zeferino Vaz, CP 6154, CEP 13083-970, Campinas, São Paulo, Brazil.
Talanta
|December 17, 2008
Summary
This study introduces bi-directional electrostacking (BDES) for arsenic (As) preconcentration and speciation. The method effectively analyzes As(V) in water samples, achieving a pre-concentration factor of 4.8.
Area of Science:
- Analytical Chemistry
- Environmental Science
- Electrochemistry
Background:
- Arsenic (As) contamination in water poses significant health risks.
- Accurate preconcentration and speciation analysis are crucial for environmental monitoring.
- Existing methods may lack efficiency or require complex procedures.
Purpose of the Study:
- To develop and validate a novel method for arsenic preconcentration and speciation analysis.
- To optimize parameters for enhanced preconcentration factor (PF) of Arsenic(V) (As(V)).
- To apply the method for determining As(V) and As(III) in various natural water samples.
Main Methods:
- Utilized bi-directional electrostacking (BDES) in a flow system for As preconcentration.
- Investigated parameters including electrostacking time, applied voltage, and support buffer composition.
- Optimized using boric acid and sodium hydroxide (0.1 mol/l) as the support buffer for As(V).
- Determined As(III) by oxidizing As(V) with potassium permanganate and calculating the difference from total As.
Main Results:
- Achieved an analytical range of 2.0–50.0 µgl⁻¹ with a limit of detection of 0.35 µgl⁻¹ at 750V for 20min.
- Obtained a pre-concentration factor of 4.8 for As(V) under optimized conditions.
- Demonstrated high recovery rates (93.5–106.4%) and acceptable precision (R.S.D.s 3–7%) in real water samples.
- Successfully applied the method to mineral, river, fountain, and gold mine water samples.
Conclusions:
- Bi-directional electrostacking (BDES) provides an efficient and reliable method for As preconcentration and speciation.
- The optimized method is suitable for analyzing As(V) and As(III) in diverse environmental water matrices.
- This technique offers a valuable tool for water quality assessment and environmental monitoring of arsenic contamination.
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