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High-yield large scale production of size-customized microplastics from biodegradable plastic mulches via variable-speed mechanical milling.
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Scientists developed a fast, affordable way to break down "biodegradable" farm mulch films into tiny microplastic pieces of controlled sizes, without expensive freezing equipment. This matters because these eco-friendly plastics still shed microplastics into soil before fully breaking down, and this method lets researchers create realistic test samples to study how these particles might affect health and the environment.
Biodegradable mulch films are increasingly used and incorporated into agricultural soils as an alternative to conventional polyethylene mulches. Although they are designed to reduce long-term plastic accumulation, they break down into microplastics before biodegradation, raising concerns about their potential ecotoxicological effects. Reliable risk assessment requires the evaluation of microplastics derived from the same mulch materials as used in the field. However, producing large quantities of microplastics from biodegradable mulch films across controlled size ranges remains challenging and often relies on costly cryogenic systems. We present a rapid, high-yield, and cost-effective method for generating microplastics from commercial biodegradable mulch films using an ultra-centrifugal mechanical mill assisted by liquid nitrogen. Microplastics in the range from <0.2 to 5 mm were produced from 600 g of BDM, with an efficiency recovery over 96% of the milled mulch. This procedure prevents polymer softening and melting during fragmentation and enables reproducible micronisation with the milling speed controlling the size distribution directly and the proportion of smaller particles increasing with higher speeds. The method allows efficient production of hundreds of grams of microplastics within hours while minimising liquid nitrogen consumption.•Cost-effective and high-yield production of microplastics from biodegradable mulch.•Speed-dependent control of particle size distribution.•An accessible alternative to dedicated cryogenic milling systems.
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Researchers developed a lab-scale multi-step mechanical procedure to produce environmentally representative microplastics and nanoplastics from commercial agricultural plastic mulch films -- including polybutylene succinate adipate and polyethylene mulch -- enabling more ecologically relevant ecotoxicity and fate studies compared to idealized polystyrene microspheres.
Assessment of cryogenic pretreatment for simulating environmental weathering in the formation of surrogate micro- and nanoplastics from agricultural mulch film
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Researchers evaluated whether cryogenic pretreatment of biodegradable agricultural mulch films can simulate the natural weathering that produces micro- and nanoplastics in fields. The study developed a procedure combining mechanical milling and wet grinding to create surrogate plastic particles that mimic those forming naturally in agricultural soils, providing a standardized approach for controlled ecotoxicity studies.
Are micro- and nanoplastics from soil-biodegradable plastic mulches an environmental concern?
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Researchers examined whether micro- and nanoplastics generated from soil-biodegradable plastic mulches pose environmental risks comparable to those from conventional plastics. They argue that when disposed of properly in soil or compost, biodegradable mulch plastics degrade relatively quickly, limiting the accumulation of their micro- and nanoplastic fragments. However, the study cautions that if these materials end up in aquatic or atmospheric environments where degradation is slower, they could still cause environmental harm.
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