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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

502
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
502
Sampling Methods: Sample Types01:18

Sampling Methods: Sample Types

313
Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
313

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Related Experiment Video

Updated: Aug 6, 2025

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
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Dynamic sequential extraction procedure using a four-channel circulating flow system for extracting Hg from soil

Tomotaka Doi1, Shinichi Hamasaki1, Hinata Yamamoto1

  • 1Department of Chemistry and Biotechnology, Faculty of Science and Technology, Kochi University, 2-5-1 Akebono-Cho, Kochi City, Kochi, 780-8520, Japan.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|March 21, 2023
PubMed
Summary
This summary is machine-generated.

A new sequential extraction procedure (SEP) using a circulating flow system (FCFS) significantly reduces time and liquid waste for analyzing leachable mercury (Hg) in soils. This method accurately quantifies mercury speciation, crucial for environmental risk assessment.

Keywords:
CirculationMercurySequential extraction procedureSoil

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Soil Science

Background:

  • Mercury (Hg) poses significant health risks, with toxicity varying by chemical form.
  • Accurate quantification of soluble Hg in soils and sediments is vital for mitigating environmental contamination.
  • Conventional sequential extraction procedures (SEP) for mercury speciation are time-consuming and require large solvent volumes.

Purpose of the Study:

  • To evaluate the risk of leachable Hg release from soil to the hydrosphere.
  • To develop and optimize a novel SEP using a four-channel circulating flow system (FCFS) for mercury analysis.
  • To reduce the time and liquid requirements of conventional SEP methods for leachable Hg.

Main Methods:

  • Development and optimization of a sequential extraction procedure (SEP) incorporating a four-channel circulating flow system (FCFS).
  • Optimization focused on extractant volume, circulation extraction time, and flushing efficiency.
  • Comparison of the FCFS-SEP with the conventional batch SEP method for mercury speciation in soil samples and a certified reference material (CRM-JSAC0403).

Main Results:

  • The optimized SEP with FCFS required significantly less extractant (45 mL) and time (2.5 h) compared to the batch SEP (75 mL, 49 h) for leachable Hg fractions.
  • A combined FCFS-SEP and batch method approach for five-step Hg extraction yielded results in good agreement with the conventional batch method.
  • No significant differences in extracted mercury concentrations were observed between the FCFS channels.

Conclusions:

  • The developed SEP with FCFS offers a more efficient and less resource-intensive method for determining leachable mercury in soils.
  • This technique accurately quantifies mercury speciation, aiding in the assessment of environmental contamination risks.
  • The FCFS-SEP is a viable and effective alternative to traditional batch methods for mercury speciation analysis.