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Multiparameter characterisation of a nano-polypropylene representative test material with fractionation; light scattering; high-resolution microscopy; spectroscopy; and spectrometry methods
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DOI：10.1039/D5EN00917K.png)
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Abstract
En 中文
Reference and quality control materials with comparable physicochemical properties to nanoplastic contaminants present in environmental and food nanoplastics are currently lacking. Here we report a nanoplastic polypropylene material prepared using a top-down approach involving mechanical fragmentation of larger plastics. The material was found to be homogeneous and stable in suspension and has been characterised for average particle size; size distribution range; particle number concentration; polypropylene mass fraction and inorganic impurity content using a wide range of analytical methods; including AF4; cFFF; PTA; (MA)DLS; MALS; SEM; AFM; TEM; STEM; EDS; Raman; ICP-MS and pyGC-MS. The material was found to have a broad size distribution; ranging from 50 nm to over 200 nm; with the average particle size value dependent on the technique used to determine it. Particle number concentration ranged from 1.7–2.4 × 1010 g−1; according to PTA. Spectroscopy techniques confirmed that the material was polypropylene; with evidence of aging due to an increased level of oxidation. The measured mass fraction was found to depend on the marker used and ranged between 3 and 5 μg g−1. Inorganic impurities such as Si; Al; Mg; K; Na; S; Fe; Cl and Ca were also identified at ng g−1 levels. Comparability and complementarity across the measurement methods and techniques is also discussed.
Keywords:
nanoplastic
polypropylene
characterization
particle size distribution
analytical methods
Journal
E
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0
Papers:
284
Citations:
6
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