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Multiple stirred-flow chamber assembly for simultaneous automatic fractionation of trace elements in fly ash samples
Warunya Boonjob1, Manuel Miró, Víctor Cerdà
1Department of Chemistry, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand.
Analytical Chemistry
|August 30, 2008
Summary
This study introduces a novel automated system for trace element analysis in solid waste, significantly reducing extraction time. The method accurately assesses readily mobilizable trace elements, aiding in environmental risk assessment.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Automation in Science
Background:
- Current automated leaching tests for trace elements are limited to small sample sizes and homogeneous materials.
- Miniaturized flow-through column approaches restrict applications to periodic investigations of trace element mobility.
Purpose of the Study:
- To propose a novel flow-based configuration for simultaneous trace element fractionation.
- To develop an automated system for analyzing trace elements in solid wastes with no sample amount limitation.
Main Methods:
- A two-step sequential extraction scheme using water and acetic acid.
- A novel flow-based configuration utilizing stirred-flow cell extraction.
- Automated system with high tolerance to flow rates and non-critical solid to liquid ratio.
Main Results:
- Simultaneous fractionation of trace elements in three solid wastes up to 1.0 g sample.
- Accurate assessment of readily mobilizable trace elements in fly ash samples.
- No significant differences found between automated method and certified reference material values.
- Overall extractable trace metals separated in less than 115 min, a significant improvement over traditional methods.
Conclusions:
- The automated stirred-flow cell extraction system is accurate and efficient for trace element analysis.
- The method is suitable for routine risk assessment studies of industrial solid byproducts.
- This approach overcomes limitations of previous automated leaching techniques.
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