Mercury Sulfide Nanoparticles Constitute a Long-Term Bioavailable Pool of Mercury in Soil-Rice Systems.
Li H, Li Y, Li D, Chen Q, Bai X
Soil Health
Rice paddies near old mining or industrial sites may be accumulating a hidden form of mercury that standard soil tests miss — and it ends up concentrated in the grain itself.
Scientists tracked a particularly tiny form of mercury — small enough to be called nanoparticles — in rice paddy soil over two and a half years. They found these tiny particles don't break down or wash away; instead, rice plants absorb them directly and they turn into methylmercury, the most dangerous form of mercury. The amount of toxic mercury ending up in rice grain was dramatically higher from these nanoparticles than from regular mercury compounds in soil.
Key Findings
Soil with mercury sulfide nanoparticles produced 13–26× higher methylmercury concentrations than soil with bulk mercury sulfide over 2.5 years.
Brown rice grown in nanoparticle-amended soil contained 14–92× more methylmercury and 5.6–68× more inorganic mercury than rice from bulk mercury treatments.
Mercury nanoparticles physically translocate inside rice tissues and remain bioavailable long-term, meaning the risk does not diminish over time as previously assumed.
chevron_right Technical Summary
Tiny mercury sulfide nanoparticles in contaminated soils are far more dangerous than larger mercury particles — they persist for years, get absorbed by rice plants, and convert to methylmercury (the toxic form) at rates up to 26 times higher than bulk mercury compounds.
Abstract Preview
Mercury sulfide nanoparticles (HgSNPs) are widespread yet poorly understood Hg species in contaminated areas. Here, we present a 2.5-year simulated experiment tracking the persistence, transformati...
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