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Strong but reversible sorption on polar microplastics enhanced earthworm bioaccumulation of associated organic compounds
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Sorption experiments showed that organic compounds bound more strongly to polar biodegradable microplastics than to conventional polypropylene, but that strong binding reduced bioavailability to earthworms, with earthworm bioaccumulation of phenanthrene from MP-contaminated soil following patterns predicted by equilibrium partitioning rather than carrier effects.
Sorption/desorption of two organic compounds (OCs), phenanthrene (PHE), and 1-nitronaphthalene (1-Nnap) on three polar and one nonpolar polypropylene (PP) microplastics (MPs) and earthworm bioaccumulation of MP associated PHE were systematically studied. Poly-butylene succinate (PBS) with the lowest glass transition temperature (T) showed the highest sorption toward PHE and 1-Nnap (K: 25,639 ± 276 and 1673 ± 28.8 L kg, respectively), while polylactic acid (PLA) with the highest T showed the least sorption (182 ± 5 and near 0), confirming that hydrophobic partition was the main driving force of sorption. However, polar interactions also contributed to the preferential sorption of 1-Nnap on polar poly-hydroxyalkanoates (PHA). Moreover, small particle size favored the sorption of MPs and simulated weathering enhanced sorption on MPs with medium/high T As for desorption, slight hysteresis was observed in most cases with near-zero hysteresis index (HI), and PHE generally had higher HI than 1-Nnap. The simulated digestive solution could further promote the desorption of PHE. The PHE concentrations in earthworms with the presence of 5% PBS or PP MPs in soil were 1.50-2.35 or 1.59-1.75 times that of the control without MPs; and PBS MPs with the smallest particle size showed the greatest enhancement. The results of this study confirmed that polar MPs could strongly but reversibly sorb both polar and nonpolar OCs and hence promote the bioaccumulation of OCs to soil organisms.
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