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Oligomers are a major fraction of the submicrometre particles released during washing of polyester textiles

Nature Water 2024 42 citations

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Researchers found that washing polyester textiles releases billions of submicrometre-sized particles per gram of fabric, but 34-89% of these tiny particles are actually plastic oligomers (short chemical chains) rather than solid plastic fragments. The number of particles released during washing correlated with how many were already present on the fiber surface before washing. This finding is significant because it means the nanoplastic pollution from laundry may be chemically different from what scientists assumed, potentially requiring different approaches to assess its health effects.

Abstract Synthetic textiles are a significant source of microplastic fibre pollution. While the microplastic fibre release mechanism during the washing of textiles is well studied, little is known about the release of nanoplastics. The first investigations on the nanoplastic fraction released during the washing and abrasion of polyester textiles have been published; however, questions were raised regarding the chemical composition of the observed submicrometre particles. Using a combination of analytical methods, we show here that 12 different polyester textiles released 4.6 × 10 10 to 8.9 × 10 11 particles per gram of textile during washing, with a mean size of 122–191 nm. The number of released submicrometre particles was not significantly influenced by the cutting method nor by the textile structure, but positively correlated ( P < 0.01) with the number of submicrometre particles present on the fibre surface before washing. We found that 34–89% of the extracted submicrometre particles were soluble in ethanol. These particles are most likely water-insoluble poly(ethylene terephthalate) oligomers. Our results clearly show the urgent need to better understand the contribution of water-insoluble oligomer particles to the pollution of the environment by anthropogenic nanoplastics.

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