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Updated: Apr 26, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
An unexplored coupling process enhances dark Hg(II) reduction in mineral-Hg(II)-DOM ternary systems
Ruiyang Sun1,2, Guoming Lin3, Yanping Li1,2
1State Key Laboratory of Soil Pollution Control and Safety, Zhejiang University, Hangzhou, China.
A novel mercury (Hg) production pathway was discovered in mineral-organic systems. This previously unrecognized source significantly enhances mercury (Hg(0)) emissions from soils, impacting global mercury cycling.
Area of Science:
- Environmental Chemistry
- Geochemistry
- Biogeochemistry
Background:
- Photochemical and microbial processes are key mercury (Hg) cycling pathways.
- These known pathways do not fully explain global elemental mercury (Hg(0)) production.
Purpose of the Study:
- To investigate Hg(0) production in goethite-Hg(II)-DOM ternary systems.
- To identify and quantify underappreciated sources of terrestrial Hg(0) emissions.
Main Methods:
- Studied the goethite-Hg(II)-DOM ternary system under dark conditions.
- Analyzed the roles of adsorption, DOM retention, and interfacial energy barriers.
Main Results:
- Net Hg(0) production was significantly enhanced in the ternary system.
- Preferential adsorption of [Hg-DOM]+ complexes and reduced interfacial energy barriers drove Hg(II) reduction.
- Ternary interactions account for an estimated 6.3% of topsoil Hg released to the atmosphere.
Conclusions:
- Mineral-Hg(II)-DOM ternary systems represent a significant, underappreciated source of Hg(0) emissions.
- These findings necessitate integrating ternary interactions into global Hg cycle models.
- Understanding these processes is crucial for assessing ecological risks associated with mercury pollution.
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