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Mercury fractionation in soil and sediment samples using thermo-desorption method.
Dominika Saniewska1, M Bełdowska1
1Institute of Oceanography, University of Gdansk, Gdynia, Poland.
Talanta
|April 11, 2017
Summary
This study introduces a simple thermo-desorption method for mercury fractionation in soils and sediments. The technique offers a cost-effective screening tool for evaluating mercury speciation in environmental samples.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Geochemistry
Background:
- Mercury (Hg) is a highly hazardous element, and its environmental fate, bioavailability, and toxicity are critically dependent on its chemical form (speciation).
- Accurate mercury speciation is crucial for environmental risk assessment, but existing methods are often expensive and time-consuming.
- Developing accessible methods for mercury speciation is essential for widespread environmental monitoring.
Purpose of the Study:
- To develop a simple and efficient thermo-desorption method for mercury fractionation in soil and sediment samples.
- To utilize a direct mercury analyzer (DMA) for characterizing mercury species based on their release temperatures.
- To establish a cost-effective screening approach for mercury speciation in solid environmental matrices.
Main Methods:
- A direct mercury analyzer (DMA-80) was employed for thermo-desorption analysis.
- Mercury species were fractionated based on the temperature ranges at which they were released from the samples.
- The method was validated using synthetic standards, natural standards (humus-like substance, methyl mercury), certified reference materials, and real environmental samples (soil, sand, marine sediment).
Main Results:
- The developed thermo-desorption method successfully fractionated mercury in soil and sediment samples.
- Temperature fractionation, despite limitations, proved effective as a screening method for estimating the contribution of different mercury compound groups.
- Results obtained from the four-step fractionation showed comparability with analyses conducted using other mercury analyzers.
Conclusions:
- The simple thermo-desorption method using a direct mercury analyzer is a viable screening tool for mercury speciation in solid samples.
- This method is particularly suitable for environmental samples with low mercury concentrations.
- The approach offers a practical alternative for preliminary mercury speciation analysis, aiding in comparative environmental studies.