How does bpa leach into water

Water bottles that can be used repeatedly are most often made from high-density polyethylene HDPE or polycarbonate. HDPE is largely accepted by recycling programs recycling code number two , but polycarbonate is more difficult to recycle recycling code number seven. To make those bottles hard and shiny, manufacturers often use bisphenol-A or BPA, a compound that has come under fire for its toxicity.

BPA is an endocrine disrupter, which means it can disrupt normal hormone function and lead to a slew of dangerous health issues. Studies have linked the compound to breast cancer. Regardless, many manufacturers have responded to consumer concerns by making their products BPA free. Fewer studies have been done on what happens to water when left in reusable water containers in high temperatures, but research done by pouring boiling water into polycarbonate indicated that more BPA leached out as a result.

But Halden says we should be concerned about how much plastic we surround ourselves with on a daily basis. He notes that the cumulative effect of being surrounded by plastics in the goods we buy or microplastics in our water has the biggest potential health impact. Personally, Halden opts for a metal water bottle instead of a reusable plastic one when trying to stay hydrated on the go.

All rights reserved. Drinking from a single water bottle left in the hot sun won't hurt you, but experts say consumers should avoid persistant exposure to plastic containers left in extreme heat. A single-use bottle on a hot summer day Most of the water bottles you find on supermarket shelves are made of a plastic called polyethylene terephthalate, or PET. Share Tweet Email. Why it's so hard to treat pain in infants.

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Go Further. They are also used as baby bottles, although two months ago 6 manufacturers in the US said they would stop selling hard plastic baby bottles made with BPA. BPA is also found in dentistry composites and sealants and in the lining of aluminum food and beverage cans. The early stages of fetal development are thought to be the most vulnerable to harm from BPA, said the authors in a prepared statement.

For the study, Michels and colleagues recruited 77 Harvard College students in April They were then each given two polycarbonate bottles and asked to use them and no other bottles for storing the cold drinks they drank for the following week. The participants gave urine samples at the end of the wash out week and the week they used the polycarbonate bottles. The results showed that their urine contained 69 per cent more BPA at the end of the polycarbonate week than at the end of the wash out week.

This means the BPA levels might have been even higher if the participants had drunk hot liquids out of them, since heat increases the amount of BPA that leaches into the liquid one of the reasons for the heightened concern around baby bottles. The authors called for more research to look into the effect of BPA on babies, and on reproductive disorders and breast cancer in adults.

If you are concerned about whether the plastic bottles you use were made with BPA, you should contact the manufacturer. For instance we have noticed that some retailers have started saying on their websites that their mineral water is sold in plastic bottles made with PET plastic, or glass, and not polycarbonate.

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