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Asymmetrical Flow Field-Flow Fractionation for Sizing of Gold Nanoparticles in Suspension
Published on: September 11, 2020
Trace gold determination by on-line preconcentration with flow injection atomic absorption spectrometry
1School of Chemical Technology, University of South Australia, The Levels, S.A. 5095, Australia.
Talanta
|April 1, 1994
Summary
This study introduces an on-line preconcentration method for trace gold analysis using flame atomic absorption spectrometry. The technique achieves high sensitivity and sample throughput for accurate gold determination.
Area of Science:
- Analytical Chemistry
- Environmental Science
Background:
- Trace gold analysis is crucial for environmental monitoring and geological exploration.
- Flame atomic absorption spectrometry (FAAS) requires efficient preconcentration techniques for detecting low gold concentrations.
Purpose of the Study:
- To develop and optimize an on-line preconcentration method for trace gold analysis using FAAS.
- To evaluate the performance of a novel immobilized phase for gold extraction.
Main Methods:
- A reverse-phase extraction column utilizing Di(methylheptyl)methyl phosphonate (DMHMP) loaded onto a macroporous resin was employed.
- Thiourea-HCl solution was used for gold elution.
- Simplex Optimization was utilized to determine optimal experimental parameters.
- Flame atomic absorption spectrometry (FAAS) was used for gold quantification.
Main Results:
- Optimized conditions yielded sensitivities of 5.2 µg/L (single column) and 2.3 µg/L (dual column).
- Sample throughput reached 45/hr (single column) and 48/hr (dual column).
- Recoveries for mixed composition samples ranged from 93% to 110%.
Conclusions:
- The developed on-line preconcentration method is effective for trace gold analysis by FAAS.
- The DMHMP-loaded resin provides a robust and efficient matrix for gold extraction.
- The method offers high sensitivity, good recoveries, and rapid sample throughput.
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