1 star (1) | 100% |
Self (Ny) on 12/17/2010:
Warning
At the time, back in the '90s, he thought little about the technology other than it was clever. But when BPA exploded into the news, about a decade ago, Warner began to develop some doubts. Research was demonstrating that this estrogen-mimicking chemical was leaching out of polycarbonate plastics, out of the resins used to line most food cans and out of dental sealants. In the womb, this chemical could disrupt the normal development of a rodent's gonads — or evoke changes that predisposed animals to later develop cancer. Warner recalls that these reports piqued his curiosity about whether the color-changing papers that were increasingly proliferating throughout urban commerce still used BPA. By this time, the organic chemist was teaching green chemistry at the University of Massachusetts. "So I'd send my students out to local stores to get their cash register receipts. " Back in the lab, they'd dissolve the paper, run it through a mass spectrometer and look for a telltale spike in the readout that signaled the presence of BPA. And they'd find it, Warner says. Not in every receipt. But in plenty. And the paper used in the receipts that contained BPA looked no different than papers that didn't. But that was then, before he co-founded the Warner Babcock Institute for Green Chemistry, an organization that works with industry to develop safer products and production processes. So earlier this week I asked Warner whether he had evidence BPA might still be present in those papers. Yep. He turned up BPA-based receipts in use the last time he looked. Which was last month. And the amount receipts carry isn't trivial. "When people talk about polycarbonate bottles, they talk about nanogram quantities of BPA [leaching out, " Warner observes. "The average cash register receipt that's out there and uses the BPA technology will have 60 to 100 milligrams of free BPA. " By free, he explains, it's not bound into a polymer, like the BPA in polycarbonates. It's just the individual molecules loose and ready for uptake. "... "At least pregnant women would know to wash their hands after picking up a BPA-laced receipt. And we'd all know to keep such paper out of hands of kids. We might also want to store those receipts in some zip-it-closed plastic baggie, not our wallets. " -- By Janet Raloff
Dollar bills and receipts tainted with Bisphenol A, report finds
http://latimesblogs.latimes.com/greenspace/2010/12/receipts-dollar-bills-are-tainted-with-bisphenol-a.html
Concerned about your BPA: Check your receipts
http://latimesblogs.latimes.com/greenspace/2010/12/receipts-dollar-bills-are-tainted-with-bisphenol-a.html