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Extraction: Advanced Methods

Extraction: Advanced Methods

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...

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Related Experiment Video

Updated: Dec 18, 2025

Utilizing Soil Density Fractionation to Separate Distinct Soil Carbon Pools

Utilizing Soil Density Fractionation to Separate Distinct Soil Carbon Pools

Published on: December 16, 2022

Determining phytolith-occluded organic carbon sequestration using an upgraded optimized extraction method: indicating

Ning Han^1,2, Yufei Yang³, Yang Gao^4,5

¹Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing, 100101, People's Republic of China.

Environmental Science and Pollution Research International

|July 18, 2018

Summary

Optimizing phytolith extraction and PhytOC determination is crucial for accurate terrestrial carbon sequestration assessments. A new wet-ashing method using sonication and specific oxidation steps significantly improves phytolith isolation and carbon storage estimations.

Keywords:

Carbon pool Extraction PhytOC stocks Phytolith Wet ashing

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Last Updated: Dec 18, 2025

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Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Published on: January 7, 2019

Area of Science:

Soil Science
Biogeochemistry
Geochemistry

Background:

Phytolith-occluded organic carbon (PhytOC) represents a significant terrestrial carbon sink.
Accurate quantification of PhytOC is essential for understanding soil carbon sequestration potential.
Current wet-ashing techniques for phytolith extraction and PhytOC determination require optimization.

Purpose of the Study:

To optimize wet-ashing techniques for phytolith extraction.
To improve the accuracy of PhytOC content determination in soils.
To enhance the estimation of phytolith carbon sequestration potential.

Main Methods:

Sequential removal of organic matter and carbonates using sonication.
Optimization of the second oxidation step during wet-ashing.
Application of an upgraded method for phytolith extraction and PhytOC analysis.

Main Results:

Sonication-assisted protocols significantly reduced extraneous material during phytolith extraction.
The optimized second oxidation step minimized the loss of excess organic carbon.
The upgraded method enhanced the precision of PhytOC quantification by up to 63.83%.

Conclusions:

An optimized wet-ashing method involving sonication, a specific oxidation step, and organic matter removal is recommended.
This improved method accurately estimates PhytOC content and carbon sequestration potential.
The study provides a more precise approach for assessing the role of phytoliths in terrestrial carbon cycling.