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Palladium when used in conjuction with iron has shown some amazing results.  This is currently being used to breakdown Trichloroethylene from the groundwater altogether. This process works by first injecting these particles down into an underground water pocket.  From there the paricles can freely move through the water, because of their hydrophilic outside layer. It can then draw in the trichloroethylene molecules and break them into harmless byproducts like non-toxic ethane, that are safe in the water. [http://www.csmonitor.com/2005/0210/p14s01-sten.html] This is also better to use then some iron nanoparticle, because when some react with the Trichloroethylene it actually makes a more toxic vinyl chloride.[http://www.sciencedaily.com/releases/2005/02/050224121521.htm]
 
Palladium when used in conjuction with iron has shown some amazing results.  This is currently being used to breakdown Trichloroethylene from the groundwater altogether. This process works by first injecting these particles down into an underground water pocket.  From there the paricles can freely move through the water, because of their hydrophilic outside layer. It can then draw in the trichloroethylene molecules and break them into harmless byproducts like non-toxic ethane, that are safe in the water. [http://www.csmonitor.com/2005/0210/p14s01-sten.html] This is also better to use then some iron nanoparticle, because when some react with the Trichloroethylene it actually makes a more toxic vinyl chloride.[http://www.sciencedaily.com/releases/2005/02/050224121521.htm]
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==How it works==
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The most common way to get the nanoparticles down to the groundwater is by an injection well. An injection well is just a pump set up to long pipes, drilled into the earths crust.(same concept used in oil and waste companies. When the well is set up there are two different ways the nanoparticles can be pumped. One way is in a porous medium in which several layers are placed on top of each other. These layers work as a filter and filter the contaminates as they pass through.  The second way is nanoparticles are directly injected in to the groundwater. In this way the nanoparticles have more mobility to more through the the groundwater of their own accord. [http://cgr.ebs.ogi.edu/iron/#results] 
    
==Downside?==
 
==Downside?==
Just as in everything in life there is a downside.  In this case as briefly mentioned before, certain nanoparticles can react more dangerously then others.  This is a concern especially in areas that are contaminated with more then one contaminant.  If you were to added the wrong nanoparticle or one that had the wrong coating, you could make the water even more lethal to drink or use.  There  is also the case that there isn't that much long term test on some of these reactions.  Most are done in labs, but few are test in the actual ground. we also aren't sure of what the nanoparticle will do in the soil after so many years.
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In this case as briefly mentioned before, certain nanoparticles can react more dangerously then others.  This is a concern especially in areas that are contaminated with more then one contaminant.  If you were to added the wrong nanoparticle or one that had the wrong coating, you could make the water even more lethal to drink or use.  There  is also the case that there isn't that much long term test on some of these reactions.  Most are done in labs, but few are test in the actual ground. In many result they even say there is limited knowledge of what effects these particles could have with human, animals, or the environment over time. It has been shown to have amazing potential but it there a price?
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[http://www.azonano.com/details.asp?articleID=1161]
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[http://www.epa.gov/swertio1/tsp/download/issue6.pdf]
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[http://www.orp.doe.gov/cp/gpp/]
       
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