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<\/div>Most of the microplastics in tap water can be removed by boiling it<\/p>\n
Yuriy Nedopekin\/Alamy<\/p>\n<\/div>\n<\/figcaption><\/figure>\n<\/p>\n
Boiling tap water before use can remove at least 80 per cent of the tiny, potentially harmful plastic particles it contains.<\/p>\n
Nano and microplastics<\/a> (NMPs) are pieces of plastics like polystyrene, polythene and polypropylene that range from between 0.001 to 5 millimetres in diameter. Their impact on health is still being studied, but researchers suspect they are damaging to humans.<\/p>\n Eddy Zeng<\/a> at Jinan University in China and his colleagues took samples of tap water and measured their levels of NMPs, finding an average concentration of 1 milligram per litre. They then boiled the samples for 5 minutes, before allowing them to cool. The levels of NMPs were then remeasured and found to have reduced by more than 80 per cent.<\/p>\n \u201cWe estimated that intakes of NMPs through boiled water consumption were two to five times less than those through tap water on a daily basis,\u201d says Zeng. \u201cThis simple but effective boiling-water strategy can \u2018decontaminate\u2019 NMPs from household tap water and has the potential for harmlessly alleviating human exposure to NMPs through water consumption.\u201d<\/p>\n <\/p>\n The NMPs were removed by becoming ensnared in crystalline structures of limescale formed from the calcium in the water, says Zeng. More particles were removed from \u201chard\u201d water \u2013 that containing high levels of calcium \u2013 than from \u201csoft\u201d water, which has lower levels of it.<\/p>\n Allowing the water to reach boiling point was an important contributing factor to how efficiently those crystalline structures were created. \u201cBoiling water has some other benefits, such as killing bacteria and parasites and removing trace heavy metals,\u201d he says.<\/p>\n \u201cThe way they demonstrated how things were deposited through the boiling process was nice,\u201d says Caroline Gauchotte-Lindsay<\/a> at the University of Glasgow, UK. However, she adds that the world should be seeking to solve the problem of microplastics in drinking water long before they reach homes. \u201cWe should be looking into modifying drinking water treatment plants so they remove microplastics,\u201d she says.<\/p>\n Topics:<\/p>\n<\/section><\/div>\n