Manganese mineral duo cleans arsenic and cuts rice paddy gases
Chen Z, Chen Y, Jia Y, Zhang J, Ge L
Soil Health
If you grow rice or care about the wetlands and paddies that feed much of the world, this points to a low-tech soil additive that keeps arsenic out of the water while shrinking the paddy's greenhouse gas footprint.
Flooded rice paddies have a nasty double problem: they can leach toxic arsenic into water and they release methane and nitrous oxide, both potent greenhouse gases. Researchers found that mixing two manganese-based minerals together shifts the underground microbial community so that helpful bacteria and microbes immobilize arsenic and even feed on methane instead of producing it. It's essentially recruiting the soil's tiny residents to fix two problems at once by rewiring how they handle electrons.
Key Findings
The Mn(NO3)2 + MnO2 combo achieved near-complete arsenic(III) immobilization in overlying water over a 24-day incubation, outperforming nitrate-alone, manganese-alone, and other combined treatments.
Cumulative methane emissions dropped about 35% and nitrous oxide emissions dropped about 61% compared to the nitrate-only treatment.
Metagenomic analysis showed enrichment of key microbes (including Candidatus Methanoperedens nitroreducens, Propioniciclava, Zoogloea, Bryobacter) and increased abundance of functional genes like nosZ, nrfA, pmoA, and mcrA, driven by a regenerative Mn(II)/Mn(IV) cycle.
chevron_right Technical Summary
Scientists found that combining two manganese-based soil treatments in flooded rice paddies can lock up toxic arsenic while cutting methane and nitrous oxide emissions, tackling two major environmental problems with one approach.
Abstract Preview
Original paper
Co-utilization of manganous nitrate and pyrolusite enables concurrent mitigation of arsenic mobilization and greenhouse gas emissions in paddy-field wetlands.
Constructed wetlands face the dual challenge of arsenic (As) mobilization and greenhouse gas (GHG) emissions under flooded anoxic conditions. Moving beyond single-process remediation, this study de...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Want to tell us more? (optional)
Thanks for the note!
Something went wrong — please try again.
Too many submissions. Try again in an hour.
Gene editing removes 97% of celiac-triggering proteins from bread wheat
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Rice is a cereal grain and in its domesticated form is the staple food of over half of the world's population, particularly in Asia and Africa. Rice is the seed of the grass species Oryza sativa —or, much less commonly, Oryza glaberrima. Asian rice was domesticated in China some 13,500 to 8,200 y...