A new analytical approach for monitoring microplastics in marine sediments

Autor(en): Nuelle, Marie-Theres
Dekiff, Jens H.
Remy, Dominique 
Fries, Elke
Stichwörter: DEBRIS; Density separation; ENVIRONMENT; Environmental Sciences; Environmental Sciences & Ecology; Gas chromatography; IDENTIFICATION; Marine plastic debris; North Sea; PARTICLES; PLASTICS; POLLUTION; Pyrolysis
Erscheinungsdatum: 2014
Volumen: 184
Ausgabe: SI
Startseite: 161
Seitenende: 169
A two-step method was developed to extract microplastics from sediments. First, 1 kg sediments was pre-extracted using the air-induced overflow (AIO) method, based on fluidisation in a sodium chloride (NaCl) solution. The original sediment mass was reduced by up to 80%. As a consequence, it was possible to reduce the volume of sodium iodide (NaI) solution used for the subsequent flotation step. Recoveries of the whole procedure for polyethylene, polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polystyrene and polyurethane with sizes of approximately 1 mm were between 91 and 99%. After being stored for one week in a 35% H2O2 solution, 92% of selected biogenic material had dissolved completely or had lost its colour, whereas the tested polymers were resistant. Microplastics were extracted from three sediment samples collected from the North Sea island Norderney. Using pyrolysis gas chromatography/mass spectrometry, these microplastics were identified as PP, PVC and PET. (C) 2013 Elsevier Ltd. All rights reserved.
ISSN: 02697491
DOI: 10.1016/j.envpol.2013.07.027

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