Researchers link water exposure to reactive chemistry on microplastics

Researchers at Columbia University and UC Berkeley found that water can make microplastic surfaces chemically active, according to WIRED. The account says this activity can produce reactive compounds capable of changing other molecules, including molecules important to living organisms.

The researchers said the reaction can occur under normal environmental conditions, without sunlight or other agents that degrade plastic. That finding points to a chemical process that does not require those additional conditions, as described by WIRED; the article does not specify a rate or quantity of compounds produced.

Wei Min, a professor of chemistry and biomedical engineering at Columbia University, said the reactive compounds likely contribute to biological damage in animals and potentially humans exposed to microplastics. This is Min’s assessment of possible biological effects; WIRED does not provide a measured level of harm or a quantified estimate of risk to people.

The article describes microplastics as small pieces that break away from larger plastic objects and says studies have found them across virtually every ecosystem on the planet.

It contrasts the new finding with the prior view that microplastics were generally considered inert, while noting that the research account does not establish the extent of any resulting biological damage. Min also said that as plastic breaks into smaller particles, its surface area grows substantially.

The article presents that change in particle surface area alongside the finding about chemical activity, but does not quantify how much surface area increases or state how that measure affects the reaction. WIRED adds that the human body has some defenses against this kind of damage. The account does not describe those defenses or assess how effective they are.

A headline from UC Berkeley likewise says microplastics are chemically active and could cause biological harm, while a UA.NEWS headline reports detection of reactive compounds on microplastics in water. Neither headline supplies additional detail about the research or its effects.