A recent study has shed light on a simple yet effective way to reduce the intake of microplastics through drinking water. Researchers have discovered that boiling and filtering tap water can significantly decrease the amount of nano- and microplastics (NMPs) consumed by individuals. These minuscule plastic particles, as tiny as one-thousandth of a millimeter in diameter, have become a growing concern due to their presence in various products and water sources.
The study, published in Environmental Science & Technology Letters, revealed that boiling mineral-rich water for just five minutes could potentially lower exposure to NMPs by up to 90%. The health risks associated with microplastic exposure are still being explored, but emerging evidence suggests that these particles can accumulate in the body and lead to various health issues such as oxidative stress, inflammation, insulin resistance, and liver problems.
While advanced water filtration systems can help capture some NMPs, the study aimed to find more accessible solutions, particularly in regions where clean water resources are limited. Boiling water presents a simple and cost-effective method to decontaminate tap water at home. The process involves boiling the water for five minutes, allowing it to cool, and then filtering out the solid residue that forms during boiling.
The effectiveness of trapping microplastics in the mineral solids formed during boiling is influenced by the hardness of the water. Hard water with higher mineral content was found to be more efficient at removing NMPs compared to softer water. This is because minerals like calcium and magnesium in hard water create a chalky residue known as calcium carbonate (CaCO3), which can trap the plastic particles.
Microplastics such as polystyrene (PS), polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET) are commonly found in groundwater and surface water due to factors like wastewater discharge and surface runoff. While the health effects of microplastic exposure are not fully understood, research has shown that ingestion and inhalation of these particles can disrupt cell function, trigger inflammation, and impact the gut microbiome.
Traditional water treatment plants are not equipped to remove NMPs from drinking water, and advanced filtration technologies are not widely available in developing countries. Boiling water provides a viable alternative for households to reduce their exposure to microplastics. However, it is important to note that boiling water alone may not eliminate all sources of microplastic exposure.
Experts suggest using glass or stainless steel containers for boiling water and allowing it to cool without stirring to facilitate the settling of microplastics bound to calcium residues. While boiling water can be a helpful precautionary measure, it is essential to consider other sources of microplastic contamination in daily life. Avoiding single-use plastics, plastic utensils, and cookware, as well as minimizing plastic exposure from household items, can further reduce the risk of microplastic ingestion.
The findings of this study highlight the potential benefits of boiling and filtering tap water as a simple yet effective way to reduce microplastic intake. Further research is needed to better understand the long-term health effects of microplastic exposure and to explore additional strategies for mitigating this environmental concern.
