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Component-specific effects of black carbon on oxytetracycline adsorption by HDPE microplastics: synergistic and antagonistic interactions and site-energy analysis
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A lab study examined how black carbon affects an antibiotic called oxytetracycline sticking to polyethylene microplastics. Solid black carbon increased how much antibiotic stayed attached to the plastic, while dissolved black carbon decreased it, suggesting the form of black carbon present changes antibiotic behavior in water.
Environmental context Microplastics, antibiotics and black carbon can occur together in aquatic environments, but different forms of black carbon may change where antibiotics remain. We found that solid black carbon increased oxytetracycline retention in systems containing polyethylene microplastics, whereas dissolved black carbon decreased it. Distinguishing solid and dissolved black carbon may improve assessments of antibiotic transport and exposure in contaminated waters.
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