You Know How Scientists Keep Finding Microplastics Literally Everywhere? Well, You’d Never Guess What Their Lab Gloves Are Coated in Straight Out of the Packaging

In recent years, the discovery of microplastics in virtually every corner of the world has raised alarm bells about the pervasive presence of plastic pollution. However, a growing number of scientists have become skeptical about the accuracy of these findings, citing issues such as poor methodology, inadequate efforts to prevent plastic contamination, and a lack of validation. Now, a team of researchers from the University of Michigan has uncovered a surprising source of potential contamination in the very tools scientists use to study microplastics: their lab gloves.

The study, published in the journal Analytical Methods, reveals that the special coatings on commonly used nitrile and latex gloves worn by scientists could be contributing to inflated measurements of microplastics. The culprit? A substance called stearates, which is added to disposable gloves to help them separate from molds more easily. These stearates are chemically very similar to microplastics, making them nearly indistinguishable in laboratory settings.

The research, led by recent University of Michigan doctoral graduate Madeline Clough, began when she noticed unusual results during a project examining airborne microplastics. Clough used special air samplers to collect environmental samples and analyzed them using light-based spectroscopy. The air samplers featured metal surfaces designed to collect any chemicals present in the air. As she prepared these surfaces, Clough wore nitrile gloves, as is standard practice.

However, when she analyzed the results, she found the number of microplastics to be orders of magnitude higher than expected. This unexpected finding prompted her team to investigate further and led to the discovery of the stearates on the gloves. Clough emphasized that their findings do not necessarily mean that microplastics are not present in the environment, but rather that the gloves' coatings could be causing false positives in measurements.

"As microplastic researchers looking for microplastics in the environment, we're searching for the needle in the haystack, but there really shouldn't be a needle to begin with," Clough stated. The team's work highlights the need for greater attention to potential sources of contamination in scientific research, particularly when studying such a delicate and complex issue as microplastics.

While the researchers acknowledge that their findings do not settle the debate over the prevalence of microplastics, they do underscore the importance of minimizing contamination in laboratory settings. The study serves as a reminder that even seemingly innocuous tools, like lab gloves, can have unintended consequences when used in sensitive experiments. As the scientific community continues to grapple with the issue of microplastics, this discovery adds another layer of complexity to the ongoing investigation.

In the face of mounting skepticism about the accuracy of microplastic research, the University of Michigan team's findings call for a reevaluation of laboratory practices and a closer examination of potential sources of contamination. While the presence of microplastics in the environment remains a cause for concern, this study suggests that scientists must also be vigilant about the tools they use to study it. As the search for microplastics in nature and within our bodies continues, the gloves worn by researchers may no longer be just a protective measure, but a potential source of error as well.