6 Out of Your Water
In the 2000 film Erin Brockovich, Julia Roberts plays a scantily clad file clerk in a small law firm who traces a cluster of health problems in a California desert town to a chemical in the groundwater there, and traces the chemical to a natural gas pumping station owned by Pacific Gas and Electric.
The source of the problem was hexavalent chromium, or chromium 6. In the movie, the company had used the chemical as a coolant and then dumped it into unlined holding ponds at their Hinkley, Calif., plant. The toxin leached into the groundwater and spread.
On Wednesday,hogan sito ufficiale, Miles O reported on the real story in Hinkley, what happened since the movie debuted, and how the Hollywood ending has since gone awry. His report was done in collaboration with the Center for Public Integrity. Here their in depth investigation.
540063508135081Protecting Americans From Danger in the Drinking WaterThe town of Hinkley, Calif., had a Hollywood moment when its battle with chromium 6 tainted water was made into the film Brockovich. But Hinkley, still struggling with contamination, hasn't had a Hollywood ending. Miles O'Brien examines what chemicals are in our drinking water and why it's so difficult to get rid of them.2013 03 13 18:29:00disabledtadJai_SC4Itrue
On the NewsHour Friday, O explores the science of what chromium 6 does to the human body and the agency charged with regulating it. There is still chromium 6 in the Hinkley groundwater, he reports, and Hinkley not alone.
Nearly 70 million Americans are believed to have hexavalent chromium in their drinking water, he reports. tap water by the Environmental Working Group detected chromium 6 in the drinking water of 31 of 35 cities tested. In every case, the levels exceeded the California EPA public health goal of .02 parts per billion.
The good news is this: There are filters you can buy to remove the chemical from your tap water.
The most effective way to remove chromium 6 from drinking water is with an ion exchange water treatment unit, said Ian Webster, president of Project Navigator, an environmental engineering project management company,hogan outlet, retained to represent the Hinkley community. PG is using this technique to treat the drinking water in Hinkley.
The technology relies on tiny beads of Jello like resin packed into columns. As the chromium laced water travels through the treatment unit, chromium 6 ions cling to the resin beads, getting removed from the water in the process. This technology is also effective for removing arsenic and manganese, which are also present in Hinkley groundwater.
A word of warning though: Over time, the metals build up in the filter, reducing its effectiveness. The unit must be actively monitored and maintained, and filters must be replaced regularly.
very much like buying a car,hogan interactive, Webster said. 10 years, you spent more on the cost of annual maintenance than the price of the actual car. here the catch. While effective at removing chromium, these systems are not terribly practical, says Renee Short, acting research director with the Environmental Working Group.
you actually looking for residential water treatment units, there just aren that many ion exchange units that are certified to reduce hexavalent chromium,hogan sito ufficiale, she said.
She recommends using reverse osmosis filters instead,lacapannadifraja hogan, many of which have been certified to remove chromium 6, along with other contaminants. Reverse osmosis filters are more affordable and easier for consumers to find at their local hardware store.
Reverse osmosis works by pumping water across a semi permeable membrane. Like a high pressure version of a coffee filter, water is squeezed across the membrane. In addition to chromium 6, such filters will also often remove arsenic, barium, copper, lead and fluoride.
The upside to reverse osmosis is that it reduces more contaminants than the standard carbon filter. The downside is that it much more energy and water intensive, and you left with a concentrated brine that must be dumped.
The Environmental Working Group has this guide for finding the right water filter. Just punch in the type of filter you looking for and contaminants you want to remove. Most can be purchased online.
really have to do your research, Short said. sure your research shows that [the filter] is certified to reduce the things that you care about. This key discovery, which pinpoints the receptor that the virus uses to infect cells in the human airways, opens up opportunities to study the virus origin, the level of risk it poses and potential drugs and vaccines.
In honor of pi day on Thursday, the NewsHour had this story on the people who love pi. It includes a book in which the letters of each word correspond to the numbers in pi. Plus, here are the beautiful Pi day pies, baked by Rebecca Jacobson for the occasion.
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