New research from the University of Queensland reveals that plastic kettles may be introducing microplastics into our drinking water during the boiling process.

The study highlights that the initial few uses of a new kettle result in the highest release of nano and microplastics. However, even after 150 uses, substantial numbers of these particles continue to be emitted.

Dr. Elvis Okoffo, involved in the research, advocates for consumer advisories on plastic kettles, emphasizing that many individuals might be unaware that their everyday routine could pose potential health risks.

“Our findings demonstrate that plastic kettles are a significant source of daily human exposure to nanoplastics and microplastics. New plastic kettles, in particular, release considerable concentrations of these particles into the water during boiling,” Dr. Okoffo explained.

The study found that a single boil in a new plastic kettle could release nearly 12 million nanoparticles per milliliter, translating to almost 3 billion particles in a standard 250ml cup of tea.

After 150 boils, there were still 820,000 nanoparticles detected per millilitre, or 205 million per cup.

Simply rinsing a kettle before use did not achieve the same result as repeat boiling and discarding.

“Many people may overlook or skip this step, highlighting the need for clearer product labelling and instructions,” he said.

“I would call on manufacturers, policymakers and regulators to inform consumers with safety guidelines or product labels warning about plastic particle release.

“Although particle concentrations drop with repeated use, our research shows there is a continuous, low-level exposure risk.”

He said further investigation was needed to better understand the human health implications of the exposure.

“The study fills an important knowledge gap about how plastic products used in homes can contribute to daily plastic exposure and how small, practical changes in everyday routines can reduce exposure to plastics.

“By combining better product design, improved labelling, and public awareness, we can help limit the amount of plastic entering both our bodies and the environment.”