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Pumice Pollution in Manus Province: Impact of Titan Ridge Volcanic…
Pumice Pollution in Manus Province: Impact of Titan Ridge Volcanic Activity
PROBLEM
Titan Ridge volcano erupted May 2026, 125km SE of Manus (ABC News 2026)
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10,000+ residents affected — boats trapped, fishing blocked (IOM 2026)
Food security threatened — fish, coral, seagrass dying (Pacific Scoop 2026)
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CHEMISTRY
Pumice composition: SiO₂ (60-75%), Al₂O₃ (13-17%), Fe₂O₃ (1-3%) (ScienceDirect 2019)
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Adsorption mechanisms
- Physical trapping — particles caught in pores
- Ion exchange — Na⁺ exchanged for Ca²⁺, Mg²⁺ (Sepehr 2013)
- Surface complexation — metals bind to Al/Fe sites (Sulaiman 2026)
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Pseudo-second-order kinetics — adsorption rate model (Yavuz 2010) aka how much and how fast adsorption happens
SOLUTIONS
WATER TREATMENT
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NaOH-modified pumice
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Acidic agents can strip away the adsorbed compounds and regenerate the pumice for multiple cycles of reuse.
Chitosan-coated pumice
Pb, Cd, dyes removed simultaneously (ScienceDirect 2025)
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OTHER USES
Construction — lightweight concrete, blocks (USGS 2004)
Sea wall construction
Example: Nonouti Island, Kiribati (2026)
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Abrasives — polishing, stone-washing (USGS 2004)
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ENVIRONMENTAL IMPACTS
MARINE LIFE
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Corals smothered — light blocked, calcification impaired (Pacific Scoop 2026)
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BEACHES & COASTLINE
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Coastal habitats destroyed — nesting, feeding grounds lost