Overview
This controlled pot study examines how different microplastic types alter heavy metal mobility and uptake in lettuce grown in contaminated soil. It is an a3 soil-to-plant-transfer and pathway paper rather than a benchmark occurrence paper because the matrix is experimentally contaminated soil under greenhouse conditions. The paper matters because it shows how co-contaminants such as microplastics can change cadmium and lead behavior in crop systems.
Key numbers
- Microplastics were added at 70-80 mg/kg to contaminated loamy sand from a smelter-impacted area.
- Copper accumulation in leaves fell from 80.84 mg/kg in the control to 26.35 mg/kg under glitter treatment.
- Root lead increased from 12.13 mg/kg to 33.57 mg/kg under fiber exposure.
- Root cadmium increased from 1.70 mg/kg to 2.05 mg/kg under fiber exposure.
- The experiment ran for eight weeks under controlled greenhouse conditions.
Methods (brief)
Lettuce seedlings were grown in contaminated loamy sand amended with four microplastic types: fibers, glitter, plastic bags, and plastic bottles. Roots and shoots were harvested and analyzed for heavy metals using MP-AES and ICP-MS, and soil sequential extraction was used to track changes in metal partitioning.
Evidence Fitness
Strong for a3 pathway evidence and moderate for a1 context only. Because this is a contaminated-soil greenhouse experiment, the measured concentrations should not be treated as market occurrence values, but the paper is highly relevant to source/pathway documentation and soil-to-plant transfer mechanics.
Implications
Supply-chain: The paper belongs in the soil-to-plant-transfer hub because it shows that microplastic type can change root and shoot metal accumulation in an edible leafy crop.
Health: The food-safety framing is still relevant because the edible plant tissue is measured directly, even though the growing conditions are experimental rather than market-representative.
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