Every day, we hear about the presence of microplastics—tiny plastic particles found in our bodies, food, water, and air. These bits of plastic can be as large as a ladybug or as small as a fraction of a red blood cell, making them difficult to identify and study.
A recent study from March 2026 reveals the challenges of measuring these particles. Researchers from the University of Michigan discovered that, despite taking precautions to avoid contamination in their lab, they recorded microplastic levels up to 1,000 times higher than earlier findings. What could explain this discrepancy?
The culprit turned out to be lab gloves. These gloves, commonly used in scientific practice, can transfer tiny amounts of particles to samples, leading to inflated microplastic counts. Specifically, stearate salts, used in glove manufacturing to help them release from mold, were often misidentified as microplastics.
When researchers use tools to identify microplastics, they rely on a method called vibrational spectroscopy. This technique analyzes how particles respond to light, creating a unique “fingerprint.” However, because stearate salts and plastics like polyethylene share similar structures, they produce similar responses, causing confusion in identification.
In testing various glove types, researchers found that one type could contribute over 7,000 incorrectly identified particles per square millimeter. This is important because many particles in this size range can enter human cells and impact health, raising concerns about misreported microplastic levels and subsequent policies influenced by this data.
Going forward, scientists are encouraged to consider alternatives. If gloves are necessary, using those made without stearates, like certain electronic manufacturing gloves, can help minimize contamination. Additionally, researchers are developing new techniques to differentiate between these substances in older datasets.
While the study revealed overestimations, it doesn’t downplay the issue of microplastics. Even with potentially lower levels than thought, their presence can still harm health and ecosystems, making ongoing research vital.
Expert input from Anne McNeil, Professor of Chemistry at the University of Michigan, emphasizes the importance of addressing these challenges for accurate future studies.
For more information about microplastics and their effects, you can read about their environmental impact.
