Andrew Turner,

Mobilisation kinetics of hazardous elements in marine plastics subject to an avian
physiologically-based extraction test,

Environmental Pollution, Volume 236, 2018, Pages 1020-1026, ISSN 0269-7491,

Abstract:
Samples of plastic collected from two beaches in southwest England (n = 185) have been analysed by XRF spectrometry for elements that are hazardous or restricted in synthetic polymers (namely, As, Ba,
Br, Cd, Cr, Hg, Pb, Sb and Se).
Overall, one or more restricted element was detected in 151 samples, with 15 cases exhibiting non-compliance
with respect to the Restriction of Hazardous Substances (RoHS) Directive.
Twelve plastics that were RoHS-non-compliant were subsequently processed into microplastic-sized fragments and subjected to an avian physiologically-based extraction test (PBET) that simulates the chemical conditions in the gizzard-proventriculus of the northern fulmar. Kinetic profiles of metal and metalloid mobilisation in the PBET
were fitted using a pseudo-first-order diffusion model with rate constants ranging from ∼0.02 to 0.5 h−1, while profiles for Br were better fitted with a parabolic diffusion model and rate constants of
7.4–9.5 (μg L−1)−1h−1/2.
Bioaccessibilities, based on maximum or equilibrium concentrations mobilised relative to total (XRF)
concentrations, ranged from <1% for Cd and Se in polyethylene and polypropylene to over 10% for Br in a sample
of expanded polystyrene and Pb in a sample of PVC. Calculations suggest that ingested plastic could
contribute about 6% and 30% of a seabird’s exposure to and accumulation of Pb and brominated compounds, respectively.

https://drive.google.com/open?id=12O9ZOcU8RPCzWESE8nhn-OnWIdKaRS8x
https://doi.org/10.1016/j.envpol.2018.01.023.
(http://www.sciencedirect.com/science/article/pii/S0269749117345165)