Microplastics have become a pervasive source of pollution across the Earth—these tiny fragments have settled in the deep sea and on Mount Everest, stuck inside volcanic rocks, filled the guts of seabirds and even fallen in fresh Antarctic snow. The problem is so widespread that some scientists are using the tiny plastics to try to define the Anthropocene, a proposed environmental epoch marked by human activity.
In a study published in Environmental Science & Technology Letters, researchers found that boiling tap water for just five minutes—then filtering it after it cools—could remove at least 80 percent of its microplastics.
To test this, the researchers began with samples of “hard” tap water, which has a high concentration of minerals such as calcium carbonate, and contaminated them with nano and microplastics (NMPs), writes the Hill’s Saul Elbein.
“We estimated that intakes of NMPs through boiled water consumption were two to five times less than those through tap water on a daily basis,” Eddy Zeng, an environmental chemist at Jinan University in China and an author of the study, tells New Scientist’s Chris Stokel-Walker. “This simple but effective boiling-water strategy can ‘decontaminate’ NMPs from household tap water and has the potential for harmlessly alleviating human exposure to NMPs through water consumption.”
Crucially, this process relies on the water containing enough calcium carbonate to trap the plastics. In the study, boiling hard water containing 300 milligrams of calcium carbonate led to an almost 90 percent drop in plastics. But in samples with less than 60 milligrams of calcium carbonate, boiling reduced the level of plastics by just 25 percent, reports Healthline’s Julia Ries.
“What’s important to note here is that the effectiveness of trapping these micro/nano plastics in these mineral solids is tied to how hard the water is—the harder the water, the more solids are formed, the more microplastics are trapped,” Anja Brandon, associate director of U.S. plastics policy at the nonprofit Ocean Conservancy who was not involved in the study, tells Healthline.
Additionally, the research wasn’t all-encompassing. The team focused only on three common types of plastics—polystyrene, polyethylene and polypropylene—and they didn’t study other chemicals previously found in water such as vinyl chloride, per the Hill.
Still, the findings show a potential path forward for reducing microplastic exposure through tap water. Boiling and filtering tap water could be a simple and cost-effective way to remove a significant amount of microplastics from our daily consumption.
Sources: Smithsonian Magazine, Healthline
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