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Issue 1, 2016
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Implications of observed PBDE diffusion coefficients in low density polyethylene and silicone rubber

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Abstract

A film-stacking technique was used to estimate diffusion coefficients of polybrominated diphenyl ethers (PBDEs) in low density polyethylene (LDPE) and silicone rubber. Substantially higher PBDE diffusion coefficients were observed for silicone rubber (AlteSil™) than for LDPE. A much steeper decrease in LDPE diffusion coefficients was found with increasing PBDE molecular weight than that for silicone rubber. From a passive sampling point-of-view, this means that for equivalent polymer–water partition coefficients for these two materials, the mass transfer resistance for these substances in the LDPE will be significantly higher than that for silicone rubber. Boundary layer control of the uptake process for silicone rubber can be expected for PBDEs. With a microplastic perspective, the low diffusion coefficients of PBDEs and in particular of decabromo diphenyl ether (BDE 209) in LDPE imply that the polymer diffusion coefficients for these plastic additives used as flame retardants need to be taken into account when considering the risk posed by microplastic particle ingestion by marine organisms.

Graphical abstract: Implications of observed PBDE diffusion coefficients in low density polyethylene and silicone rubber

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Publication details

The article was received on 07 Oct 2015, accepted on 30 Nov 2015 and first published on 18 Dec 2015


Article type: Paper
DOI: 10.1039/C5EM00507H
Author version available: Download Author version (PDF)
Citation: Environ. Sci.: Processes Impacts, 2016,18, 87-94
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    Implications of observed PBDE diffusion coefficients in low density polyethylene and silicone rubber

    J. F. Narváez Valderrama, K. Baek, F. J. Molina and I. J. Allan, Environ. Sci.: Processes Impacts, 2016, 18, 87
    DOI: 10.1039/C5EM00507H

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