Previous studies have found that bisphenol A (BPA), a chemical widely used in the packaging industry, shows up in grocery receipts. Since people sometimes put receipts in their wallets, it should come as no surprise that another study finds BPA is all over the world's money supply.
A study published in the American Chemical Society's journal Environmental Science & Technology says BPA has been detected on nearly all of the world's currencies. The amounts of BPA on dollars, Euros, rubles, yuans, and other currencies, are higher than in house dust, but human intake from currency is at least 10 times less than those from house dust.
Scientists Kurunthachalam Kannan and Chunyang Liao analyzed 156 pieces of paper money from 21 countries found that all contained traces of BPA. The report notes, however, that "estimated daily intake from paper currencies were 10-fold lower than those reported from exposures due to [indoor] dust ingestion in the United States."
Brazilian currency among highest levels
The highest BPA levels were in paper money from Brazil, the Czech Republic and Australia, while the lowest occurred in paper money from the Philippines, Thailand, and Vietnam. Levels in U.S. notes were about average.
Although a recent study found traces of BPA in U.S. currency, nobody knew until now about BPA in paper money worldwide.
Manufacturers use BPA to make polycarbonate plastics used in some consumer products, including water bottles, sports equipment, and household electronics.
Some studies have suggested that BPA acts as an endocrine disruptor — meaning it mimics the action of the sex hormone estrogen. Exposure to BPA has been linked to a variety of health problems.
Thermal paper receipts
Kannan and Liao also found that the most likely source of the BPA in the currency is the thermal paper used in cash register receipts. They showed that receipts can transfer BPA onto cash when placed next to it or when a receipt is touched before handling currency.
"Although high levels of BPA were measured in paper currencies, human exposure through dermal absorption appears to be minor," the article notes.
The Food and Drug Administration (FDA) believes that low levels of BPA are safe, but signaled last year that it is taking note of new research suggesting some health issues.
New interest at FDA
“Studies employing standardized toxicity tests have thus far supported the safety of current low levels of human exposure to BPA,” The agency said in January 2010. “However, on the basis of results from recent studies using novel approaches to test for subtle effects, both the National Toxicology Program at the National Institutes of Health and FDA have some concern about the potential effects of BPA on the brain, behavior, and prostate gland in fetuses, infants, and young children.”
Government health researchers are currently carrying on more studies on BPA. Meanwhile, the FDA said it is “taking reasonable steps to reduce human exposure to BPA in the food supply.”
A study finds that BPA traces can be found on most of the world's currencies...