What does this research mean for the field?

A new thermodynamic-kinetic workflow successfully constructs equilibrium and quench speciation diagrams for mercury-bearing volcanic gases, demonstrating that hot magmatic gases favor elemental mercury while cooling and oxidation favor mercury chloride. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To develop a reduced thermodynamic and kinetic workflow for determining equilibrium and quench speciation diagrams of volcanic mercury using major gas backgrounds.

September 14, 2026Frontiers in Earth ScienceOpen Access

A thermodynamic–kinetic approach to equilibrium and quench speciation of volcanic mercury

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Authors

SSSebastiano Ettore SpotoUniversity of Florence

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Implication

Computational modeling demonstrates that cooling and oxidation shift volcanic mercury from elemental to halide forms in magmatic gas plumes, highlighting how kinetic quenching governs speciation.

Key Points

To develop a reduced thermodynamic and kinetic workflow for determining equilibrium and quench speciation diagrams of volcanic mercury using major gas backgrounds.
Treated the major H–O–C–S–Cl–Br gas system as a thermodynamic background defining redox state, sulfur fugacity, and halogen availability.
Partitioned trace mercury into elemental, halide, and sulfide reservoirs using analytical transition boundaries and a kinetic lag quench index in log-activity-ratio space.
Benchmarked the control calculation using thermochemical data applied to an Etna-type magmatic cooling scenario.
Derived analytical transition boundaries that successfully connect mercury speciation directly to observable volcanic gas ratios.
Demonstrated through benchmark calculations that hot magmatic gases predominantly favor elemental mercury (Hg⁰), whereas cooling, oxidation, and hydrogen chloride enrichment drive a shift toward mercuric chloride (HgCl₂).

Cite This Study

Sebastiano Ettore Spoto (2026) studied this question.

synapsesocial.com/papers/6aa7b3440926e14a848b1ffb https://doi.org/10.3389/feart.2026.1902534

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Implication

Computational modeling demonstrates that cooling and oxidation shift volcanic mercury from elemental to halide forms in magmatic gas plumes, highlighting how kinetic quenching governs speciation.

A thermodynamic–kinetic approach to equilibrium and quench speciation of volcanic mercury

Discussion

Member takes

Implication

Key Points

Cite This Study

A thermodynamic–kinetic approach to equilibrium and quench speciation of volcanic mercury

Discussion

Member takes

Implication

Key Points

Cite This Study

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