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Direct magnetic sorbent sampling flame atomic absorption spectrometry (DMSS-FAAS) for highly sensitive determination
Lucimara Mendonça Costa1, Fabrício Alves Borges1, Marcello Henrique da Silva Cavalcanti2
1Laboratory of Toxicant and Drug Analyses, Faculty of Pharmaceutical Sciences, Federal University of Alfenas, 37130-001, Alfenas, MG, Brazil; Institute of Chemistry, Federal University of Alfenas, 37130-001, Alfenas, MG, Brazil.
Analytica Chimica Acta
|March 16, 2023
Summary
A new direct magnetic sorbent sampling method for flame atomic absorption spectrometry (DMSS-FAAS) significantly enhances lead (Pb2+) detection sensitivity. This innovative technique offers a 40-fold improvement over conventional methods, enabling faster and more accurate water sample analysis.
Area of Science:
- Analytical Chemistry
- Environmental Science
- Materials Science
Background:
- Flame atomic absorption spectrometry (FAAS) is a common technique for metal ion determination.
- Conventional FAAS methods often involve multiple steps, including nebulization, which can limit sensitivity.
- There is a need for more sensitive and efficient methods for analyzing trace metal ions in water samples.
Purpose of the Study:
- To develop a novel direct magnetic sorbent sampling procedure for flame atomic absorption spectrometry (DMSS-FAAS).
- To synthesize and characterize magnetic graphene oxide aerogel (M-GOA) particles for efficient metal ion extraction.
- To evaluate the performance of the DMSS-FAAS method for the determination of Pb2+ ions in water samples.
Main Methods:
- Magnetic graphene oxide aerogel (M-GOA) particles were synthesized and characterized.
- M-GOA was used for magnetic dispersive solid-phase extraction of Pb2+ ions from water.
- Metal-loaded magnetic sorbents were directly inserted into the FAAS flame for desorption and atomization using a metallic magnetic probe.
- The DMSS-FAAS method was compared to conventional FAAS via nebulization.
Main Results:
- The DMSS-FAAS method achieved a sensitivity improvement of at least 40 times for Pb2+ determination compared to conventional FAAS.
- The analytical curve for Pb2+ was linear from 5.0 to 180.0 μg L-1 with a limit of detection of 1.30 μg L-1.
- The method demonstrated satisfactory performance in the presence of various interfering ions and was also effective for Cd2+ determination using different magnetic sorbents.
Conclusions:
- The developed DMSS-FAAS procedure offers a simple, highly sensitive, and reproducible method for metal ion determination.
- Direct insertion of magnetic sorbents into the flame eliminates the need for a nebulization system, drastically increasing the analytical signal.
- The method shows high potential for efficient and mechanized analysis of trace metals in environmental samples.
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