Let’s start with the result: bottled water is much more contaminated with plastic than previously assumed. The research team, led by Naixin Qian, discovered an average of 240,000 plastic fragments per litre of water, which significantly exceeds previous estimates.

But how is this possible?
The extent of the problem was not apparent in earlier studies, as nanoplastics had never been specifically searched for before. However, the use of newly developed measurement and calculation technology has now enabled the researchers to specifically search for plastic particles in the nanometre range.

Three of the most common water brands in the USA were tested, and between 110,000 and 370,000 plastic fragments per litre were found. Of these, 90 % were nano-plastics and 10 % micro-plastics.
Surprisingly, the majority of the nanoplastics found did not consist of the usual PET plastic, but mainly of polyamide.

It is currently only possible to make assumptions about how the polyamide gets into the water. The researchers assume that the plastic finds its way into the water through the use of plastic membranes during the treatment and filtering process.

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