Desorption modeling of hydrophobic organic chemicals from plastic sheets using experimentally determined diffusion coefficients in plastics
Desorption modeling of hydrophobic organic chemicals from plastic sheets using experimentally determined diffusion coefficients in plastics
Birgit Westermayr Hwang Lee, Da-Eun Byun, Ju Min Kim, Jung-Hwan Kwon,
Desorption modeling of hydrophobic organic chemicals from plastic sheets using experimentally determined diffusion coefficients in plastics,
Marine Pollution Bulletin,Volume 126, 2018, Pages 312-317, ISSN 0025-326X,
Abstract:
To evaluate rate of migration from plastic debris, desorption
of model hydrophobic organic chemicals (HOCs) from polyethylene
(PE)/polypropylene (PP) films to water was measured using PE/PP films
homogeneously loaded with the HOCs. The HOCs fractions remaining in the
PE/PP films were compared with those predicted using a model
characterized by the mass transfer Biot number. The experimental data
agreed with the model simulation, indicating that HOCs desorption from
plastic particles can generally be described by the model. For
hexachlorocyclohexanes with lower plastic-water partition coefficients,
desorption was dominated by diffusion in the plastic film, whereas
desorption of chlorinated benzenes with higher partition coefficients
was determined by diffusion in the aqueous boundary layer. Evaluation of
the fraction of HOCs remaining in plastic films with respect to film
thickness and desorption time showed that the partition coefficient
between plastic and water is the most important parameter influencing
the desorption half-life.
https://doi.org/10.1016/j.marpolbul.2017.11.032.(http://www.sciencedirect.com/science/article/pii/S0025326X1730989X)
https://drive.google.com/open?id=1ykdsS5Rmh7N1AHkGbjxJuZTV5DCwDlp9
