How Plastics Affect Arsenic in Paddy Soils

It's no secret that tiny plastic pieces, called microplastics, are showing up in places they don't belong, like paddy soil. Scientists decided to check how this affects the way arsenic behaves in the soil. They ran a 98-day experiment using both regular and biodegradable microplastics in soil contaminated with arsenic. Regular microplastics, surprising as it may be, cut down the arsenic in the water between soil particles by 25-38%. But they also increased the amount of a specific form of arsenic in the soil by 8-23 times! Biodegradable microplastics, on the other hand, raised the arsenic in the water and the same form of arsenic in the soil even more, by 2-9 times and 11-395 times respectively.

The scientists think this happens because the plastic pieces change how microbes in the soil work. Regular microplastics might slow down arsenic movement by boosting certain microbes that handle arsenic. Biodegradable microplastics might release more arsenic and also boost the same form of arsenic by encouraging specific bacteria. These findings could help us understand more about how arsenic moves around in paddy soil and how to stop the mix of arsenic and microplastic pollution.

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