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Sorption of cortisone on polypropylene, polystyrene, and polyethylene microplastics.

Riccardo De Santo1, Lorenzo Antonelli1, Alessandra Gentili1

  • 1Department of Chemistry, Sapienza University, P.le Aldo Moro, 5. 00185, Rome, Italy.

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|May 29, 2025
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Summary
This summary is machine-generated.

Microplastics (MPs) adsorb cortisone, acting as vectors for contaminants in aquatic environments. Sorption capacity varied between Milli-Q water and artificial seawater, highlighting environmental influences on contaminant binding.

Keywords:
CortisoneHigh-performance liquid chromatographyMicroplasticsPelletsSorption behaviour

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Polymer Science

Background:

  • Microplastics (MPs) are recognized vectors for pollutants in aquatic ecosystems.
  • Understanding contaminant sorption mechanisms on MPs is crucial for environmental risk assessment.
  • Cortisone, a pharmaceutical, can be transported by MPs, posing potential ecological risks.

Purpose of the Study:

  • To investigate the sorption behavior of cortisone on different types of microplastics.
  • To compare cortisone sorption in Milli-Q water versus artificial seawater.
  • To determine the predominant sorption mechanisms and capacities.

Main Methods:

  • Batch sorption experiments were conducted using polypropylene, polystyrene, and high-density polyethylene MPs.
  • High-performance liquid chromatography with an ultraviolet detector was used for cortisone quantification.
  • Kinetic and isotherm studies were performed under controlled laboratory conditions (1000 rpm agitation, 20°C).

Main Results:

  • All tested microplastic types exhibited sorption affinity for cortisone.
  • Sorption capacity ranged from 0.25 to 0.6 µg of cortisone per gram of plastic.
  • Significant differences in sorption capacity and mechanism were observed between Milli-Q water and artificial seawater.

Conclusions:

  • Microplastics effectively sorb pharmaceutical contaminants like cortisone.
  • The aquatic medium (freshwater vs. seawater) significantly influences microplastic-contaminant interactions.
  • Further research is needed to fully elucidate the environmental implications of these sorption processes.