Black Lung – Miners pay so you can get more coal

Chemical & Engineering News: Latest News – Bisphenol A May Trigger Human Breast Cancer

Soto and her colleagues exposed pregnant rats to bisphenol A at doses ranging from 2.5 to 1,000 µg per kg of body weight per day. By the time the pups exposed at the lowest dose reached the equivalent of puberty (50 days old), about 25% of their mammary ducts had precancerous lesions, a proportion three to four times higher than among the nonexposed controls. Mammary ducts from all other exposure groups showed elevated levels of lesions. Cancerous lesions were found in the mammary glands of one-third of the rats exposed to 250 µg/kg/day.

Bisphenol A is used in the manufacture of polycarbonate plastics and epoxy resins. It is found in many food and beverage containers, including baby bottles. It is also found in canned food linings and dental composites, and it leaches from all of these products. In one study, Soto notes, urine samples from 95% of the human subjects contained the chemical.

The Environmental Protection Agency has set a safe human intake dose of 50 µg/kg/day for bisphenol A. “On the basis of the effects observed in recent studies, this seems to be an unsafe level,” Soto says.

Bisphenol A is old news, BTW, people have known for a while about this chemical’s propensity to carcinogenicity. Of course, there’s that whole argument about pregnant mice being more susceptible to chemicals than humans, etc. So, the jury is still out. but Soto is right, 50 µg/kg/day seems to not provide enough of a safety factor. The EU uses 10 µg/kg/day, though they do say that

realistic worst-case estimates of consumer exposure via foodstuffs, range from 0.00048 mg/kg bw/day for adults to 0.0016 mg/kg bw/day for infants, which is well below the maximum exposure level

Of course, who knows what additive effects this chemical may have with the multitude of other chemicals floating around. Doing tests of single chemicals and trying to link that to epidemiological data is a perilous undertaking, the connections are tenuous most of the time and the plastics companies routinely fund studies that prove otherwise, because as you know, if you know what you’re going to find before you study it, you will find it!

Read the wikipedia stub on polycarbonates. Us yuppies who drink religiously from Nalgene bottles to avoid phthalates and nasty tastes would do good to take note! I guess glass is the best, though it does have that annoying tendency to shatter when dropped… Water from glass bottles do have the best taste, though.

BlogTogether

Thanks for a kickass conference, Anton, Bora, Brian and The real Paul Jones, thanks so much for the great program and getting all these people together. Everything worked, wifi, lunch, dinner, all the projectors, all the microphones, the swag, wow! It was great to put faces to people, make connections, etc.

Technorati Tags: sciencebloggingconference

newsobserver.com | Mine plan would erase wetlands

The proposal by PCS Phosphate, if approved, would represent the single largest destruction of wetlands permitted in the state — 2,500 acres including the headwaters of seven creeks near the Pamlico River. The rich deposit of black phosphate rock, left by ancient oceans and buried 100 feet beneath the surface, has been extracted from the site by various companies for about 40 years. PCS has worked the mine since 1995 to get phosphate for fertilizer and for use in food additives. In food, it’s turned into phosphoric acid — a flavor enhancer in such products as Coca-Cola, jellies and vegetable oil.

Yes, this is right, phosphoric acid is a “flavor enhancer”. Well, the mine employs a 1000 people in the area, and is not necessarily an evil that must be stopped at all times, for that, see Hog Factories! But this disturbs me.

Hunter Turnage, 44, a Raleigh cable television salesman, has a house across the river from the PCS mine. He is one of several people who have written letters to the state complaining about the odor when the wind blows from the south.

“If you don’t want to smell it, you shut up the windows and turn on the air conditioner,” Turnage said.
“It’s something you just deal with. … I kept thinking one day they would run out of areas to mine. I think they’ll stay there forever –as long as they get continued rights to destroy the wetlands.”

It’s one thing to use up wetlands, knowing fully well that the law requires you to create wetlands elsewhere to compensate, this smell issue is more problematic, and hard to legislate. Which means that various Environmental Justice issues will also come into play.

Boy, it’s all arsenic all the time on this blog!

Chemical & Engineering News: Latest News – In Katrina’s Wake, An Arsenic Threat

An incredible 72 million m³ of debris was created when Hurricane Katrina wreaked havoc in Louisiana and Mississippi in 2005. A survey of this debris now reveals that an estimated 1,740 metric tons of arsenic could leach into groundwater from unlined landfills where the materials are being disposed (Environ. Sci. Technol., DOI: 10.1021/es0622812).

Here’s EPA’s page on arsenic treated wood, and here’s the cheerleader page for same (mmm, industry advocacy websites, delicious!). Note that the EPA is currently working with the manufacturers to “voluntarily” phase out the use of Chromated Copper Arsenate in residential settings. Note that there are several alternatives available, all of them less toxic and equally effective. While this “voluntary” action limits direct exposure for certain types of people, old wood ending up in unlined landfills will overwhelmingly affect people who live near said landfills, namely the poor, and African American. 

Even lined landfills leak eventually, and while other organic matter may degrade before the leaking, arsenic and heavy metals are not going anywhere. Unlined landfills, which is a fancy way of saying hole in the ground where you throw trash in, are completely unacceptable in this day and age in a so called developed country like the US of A. On the other hand, it is fashionable to refer to Louisiana as a third world country, so I guess anything goes for those kinds of people, eh.