From Columbia Mailman School of Public Health, January 9, 2024: 

Over recent years, there has been rising concern that tiny particles known as microplastics are showing up basically everywhere on Earth, from polar ice to soil, drinking water and food. Formed when plastics break down into progressively smaller bits, these particles are being consumed by humans and other creatures, with unknown potential health and ecosystem effects. One focus of research: bottled water, which has been shown to contain tens of thousands of identifiable fragments in each container.

Now, using newly refined technology, researchers have entered a whole new plastic world: the poorly known realm of nanoplastics, which are the spawn of microplastics that have broken down even further. For the first time, they counted and identified these minute particles in bottled water. They found that on average, a liter contained some 240,000 detectable plastic fragments—10 to 100 times greater than previous estimates, which were based mainly on larger sizes.

The study by researchers at Columbia University Lamont-Doherty Earth Observatory, Columbia University, and Columbia Mailman School of Public Health was just published in the journal Proceedings of the National Academy of Sciences(link is external and opens in a new window).

Nanoplastics are so tiny that, unlike microplastics, they can pass through the intestines and lungs directly into the bloodstream and travel from there to organs including the heart and brain. They can invade individual cells, and cross through the placenta to the bodies of unborn babies. Medical scientists are racing to study the possible effects(link is external and opens in a new window) on a wide variety of biological systems.

Read more here.