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Adsorption of BDE-209 to Polyethylene Microplastics: Effect of Microplastics Property and Metal Ions
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Researchers studied how polyethylene microplastics affect the binding of a common flame retardant (BDE-209) in soil, finding that microplastics slightly reduced the soil's overall capacity to hold the pollutant, with smaller and less-aged plastic particles having the largest effect on contaminant behavior.
In this work, the effect of polyethylene microplastics (MPs) on the adsorption of decabromodiphenyl ether (BDE-209) in a sandy loamy soil and aqueous solution was investigated by performing batch tests. Results show that the overall adsorption capacity of soil/MPs mixture decreased slightly after MPs spiking because of the dilution effect, namely MPs were weaker receptor for BDE-209 than the soil particles. The adsorption capacity increased with reducing the MPs size. The equilibrium adsorption amount of aged MPs (4.15 mg/kg) declined apparently compared with that of the original MPs (7.63 mg/kg). According to the fitting parameters of kinetic and isothermal adsorption study, the adsorption of BDE-209 by MPs was a heterogeneous and multi-layer uneven adsorption process. The existence of Cu2+ ions or humic acid exerted a negative impact on the adsorption of BDE-209. In summary, the findings of this work underline the potential significance of MPs as contaminant carriers in co-contaminated soils.
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Researchers reviewed how chemical contaminants that bind to microplastics — including pesticides and heavy metals — affect aquatic and soil organisms, finding that microplastics can both concentrate toxins and amplify their biological impact. This so-called Trojan horse effect may make microplastic pollution more ecologically harmful than the plastic alone would suggest.
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