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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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Quantification of Humic and Fulvic Acids in Humate Ores, DOC, Humified Materials and Humic Substance-Containing Commercial Products

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Published on: March 18, 2022

Selective Modifier-Assisted Humic Acid Extraction: Implications for Soil Quality Enhancement.

Zixin Zhang¹, Qi Chen¹, Kunyu Xu¹

¹National Engineering Research Center for Efficient Utilization of Soil and Fertilizer Resources, College of Recourses and Environment, Shandong Agricultural University, Tai An, Shandong 271018, China.

Environmental Science & Technology

|April 26, 2024

Summary

Novel selective modifiers (SMs) enhance humic acid (HA) extraction, improving soil quality and saline soil remediation for eco-friendly farming. These modified humic acids (SMHs) boost soil structure and salt leaching.

Keywords:

functional groups humic acid saline soil remediation selective modifiers

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Extraction of High Molecular Weight Genomic DNA from Soils and Sediments

Extraction of High Molecular Weight Genomic DNA from Soils and Sediments

Published on: November 10, 2009

Area of Science:

Soil Science
Environmental Chemistry
Materials Science

Background:

Efficient humic acid (HA) utilization is key for sustainable agriculture and environmental cleanup.
Understanding how HA modification impacts soil quality and remediation effectiveness is crucial.
Current methods lack targeted approaches for optimizing HA properties.

Purpose of the Study:

To develop novel selective modifiers (SMs) for targeted HA extraction.
To investigate the structural and chemical changes in HA after modification.
To evaluate the efficacy of modified humic acids (SMHs) in saline soil remediation and soil quality enhancement.

Main Methods:

Selective modifiers (SMs) were synthesized by codoping sodium and copper into a birnessite lattice.
The structure of SMs and extracted SMHs were characterized.
SMHs were analyzed for functional groups, molecular weight, carbon composition, and flocculation limits.
The effectiveness of SMHs in saline soil remediation was assessed through salt leaching and soil aggregate analysis.

Main Results:

SMs with codoped sodium and copper altered valence states and reactive oxygen species compared to manganese-based modifiers.
SMHs exhibited increased acidic functional groups, reduced molecular weight, and transformed aliphatic carbon content.
Application of SMHs led to enhanced salt leaching and improved soil aggregate structure in saline soils.

Conclusions:

Targeted modification of HA through novel SMs significantly alters its chemical structure and properties.
SMHs demonstrate considerable potential for improving soil quality and remediating saline soils.
This research provides a foundation for developing advanced HA-based solutions for eco-friendly farming and environmental remediation.