Heat Has A Significant Impact On How Much Microplastic Is Released From Some Single Use Coffee Cups – CoffeeTalk

Microplastics are tiny plastic fragments, measuring between 1 micrometre and 5 millimetres, that arise from the breakdown of larger plastic items or are directly released from products during use. They pervade our environment, food, and bodies, although definitive research on their retention in human tissues is lacking due to contamination issues in studies. Consequently, additional investigations into the long-term health impacts of microplastics are critical.

A meta-analysis conducted by researchers indicated a significant relationship between temperature and microplastic release. By reviewing data from 30 peer-reviewed studies, it was found that microplastic release from common plastics like polyethylene and polypropylene heightened with increasing temperatures of contained liquids. Reported microplastic releases varied widely, from hundreds to over eight million particles per litre. Interestingly, the duration that the drink remained in a plastic cup did not correlate as strongly to microplastic release compared to the initial temperature.

In an empirical study involving 400 coffee cups in Brisbane, researchers tested plastic cups made of polyethylene versus plastic-lined paper cups at temperatures of 5°C and 60°C. Results indicated that plastic cups released more microplastics than paper-lined cups, irrespective of temperature conditions. Notably, switching from cold to hot water in all-plastic cups escalated microplastic release by approximately 33%. If an individual consumes 300 millilitres of coffee daily from a polyethylene cup, they risk ingesting about 363,000 microplastic particles annually.

The thermal impact on microplastic release was attributed to the structural characteristics of the cups. High-resolution imaging showed all-plastic cups exhibited rougher surfaces with irregularities, which facilitated the detachment of particles. Heat exacerbated this issue by softening the plastic and inducing expansion and contraction, resulting in further fragmentation.

To mitigate exposure, consumers can adapt their habits regarding takeaway drinks. Opting for reusable cups made of materials like stainless steel, ceramic, or glass—none of which shed microplastics—is advantageous. In situations where disposable cups are necessary, plastic-lined paper cups are preferable given their lower particle release. Additionally, avoiding the direct pouring of boiling liquids into plastic-lined containers can help manage the risks, as cooler temperatures can relieve stress on the plastic lining and reduce overall microplastic exposure. By understanding the interplay between heat and material selection, better product designs and healthier decisions can be achieved regarding our beverage consumption.

Read More @ The Conversation