As drinking water flows through pipes and into a glass, it runs against the rubber seals inside some plumbing devices. These parts contain additives that contribute to their flexibility and durability, but these potentially harmful compounds can leak into drinking water, according to a small-scale study. The authors report that the released compounds, which are typically linked to tire pollution, also transformed into other unwanted byproducts.
As drinking water flows through pipes and into a glass, it runs against the rubber seals inside some plumbing devices. These parts contain additives that contribute to their flexibility and durability, but these potentially harmful compounds can leak into drinking water, according to a small-scale study in ACS'. The authors report that the released compounds, which are typically linked to tire pollution, also transformed into other unwanted byproducts.
To enhance rubber's strength and durability, manufacturers typically mix in additives. Scientists have shown that tire dust can transport these substances, such as 1,3 diphenylguanidine and-phenyl-1,4-benzenediamine , into waterways. DPG and 6PPD have also been detected in drinking water samples, though it's unclear how the compounds got there.
In this pilot study, the team collected tap water from 20 buildings and detected polymer additives at parts per trillion levels in every sample. The researchers explain that these compounds are not currently regulated, but the measured levels are potentially concerning, based on their previous study's results from human cell bioassays. And the samples from faucets with aerators contained the highest total amounts.
To see if these compounds could have come from plumbing fixtures, the team tested rubber O-rings and gaskets from seven commercial devices, including faucet aerators and connection seals. In the experiment, the rings sat in water with or without chlorinated disinfectants for up to two weeks. Most of the seals, except for the silicone-based ones, released DPG and 6PPD additives.
The authors acknowledge funding from the Merlion programme; the French Ministry of Europe and Foreign Affairs; the Nanyang Technological University; the National Research Foundation of Singapore; and the Public Utilities Board, Singapore's National Water Agency.
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Rubber plumbing seals can leak additives into drinking water, study saysAs drinking water flows through pipes and into a glass, it runs against the rubber seals inside some plumbing devices. These parts contain additives that contribute to their flexibility and durability, but these potentially harmful compounds can leak into drinking water, according to a small-scale study in Environmental Science & Technology Letters. The authors report that the released compounds, which are typically linked to tire pollution, also transformed into other unwanted byproducts.
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