Boiling tap water can remove 80 per cent of the microplastics in it
Tap water contains tiny particles of plastic and we don’t know how they affect our health – now it seems that boiling the water for 5 minutes can remove most of them
By Chris Stokel-Walker
28 February 2024
Most of the microplastics in tap water can be removed by boiling it
Yuriy Nedopekin/Alamy
Boiling tap water before use can remove at least 80 per cent of the tiny, potentially harmful plastic particles it contains.
Nano and microplastics (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.
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Eddy Zeng 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.
“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,” says Zeng. “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.”
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 “hard” water – that containing high levels of calcium – than from “soft” water, which has lower levels of it.
