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Ultrasonic assisted magnetic solid phase extraction of ultra-trace mercury with ionic liquid functionalized materials
Di Zhang1, Xin-An Yang1, Cheng-Zhao Jin1
1Department of Applied Chemistry, Anhui University of Technology, Maanshan, Anhui, 243002, PR China.
Analytica Chimica Acta
|February 3, 2023
Summary
Ultrasonic dispersion enhances magnetic material adsorption of trace mercury (Hg2+). Higher ultrasonic frequency and power significantly improve mercury enrichment, enabling sensitive detection via US-assisted magnetic solid-phase extraction.
Area of Science:
- Analytical Chemistry
- Environmental Science
- Materials Science
Background:
- Particle agglomeration hinders the full utilization of magnetic powder adsorbents.
- Effective dispersion is crucial for maximizing adsorption capacity and efficiency.
- Trace mercury (Hg2+) detection requires sensitive and reliable methods.
Purpose of the Study:
- To investigate the effect of ultrasonic (US) assisted dispersion on the adsorption of trace mercury (Hg2+) by ionic liquid functional magnetic materials.
- To optimize US parameters for enhanced mercury adsorption and develop a sensitive detection method.
- To evaluate the performance of the developed US-assisted magnetic solid-phase extraction (US-MSPE) method.
Main Methods:
- Systematic study of mercury (Hg2+) enrichment using ionic liquid functional magnetic materials in US-assisted dispersion mode.
- Analysis of the influence of US parameters (frequency, power, duration) on material dispersion and adsorption properties.
- Development and application of slurry vapor generation atomic fluorescence spectroscopy (SVG-AFS) for in-situ desorption and measurement.
Main Results:
- US-assisted dispersion led to more uniform distribution of magnetic materials, accelerating trace Hg2+ adsorption.
- Higher ultrasonic frequency and power demonstrated a positive correlation with cavitation effect and mercury enrichment, increasing it by 1-2 times.
- The developed US-MSPE method achieved a low detection limit (0.36 ng L-1), high recovery (>90%), and good precision (<5%) for ultra-trace Hg2+.
Conclusions:
- Ultrasonic dispersion is an effective strategy to overcome particle agglomeration and enhance the adsorption performance of magnetic functional materials.
- Optimized US parameters, particularly high frequency and power, significantly improve mercury enrichment efficiency.
- The US-MSPE coupled with SVG-AFS provides a sensitive, efficient, and sustainable method for ultra-trace mercury determination in environmental samples.
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