Comments on: New Study Finds Nanosilver Products Toxic to Fish http://www.beyondpesticides.org/dailynewsblog/?p=3228 News on pesticide science, policy and activism Thu, 16 May 2013 16:03:44 +0000 hourly 1 http://wordpress.org/?v=3.5.1 By: Gerald Wichmann http://www.beyondpesticides.org/dailynewsblog/?p=3228#comment-91188 Gerald Wichmann Mon, 16 Aug 2010 14:45:22 +0000 http://www.beyondpesticides.org/dailynewsblog/?p=3228#comment-91188 Dear Dr. Sepulveda,
I have a sanitizer that I want to register with the EPA. The EPA requires that prove that I don’t have nanoparticals in the aqueous product or that I have data on their size. Could you do this testing and what would be the cost?
Kindest regards,
Gerald Wichmann

]]> By: Silver Nanotechnology Working Group http://www.beyondpesticides.org/dailynewsblog/?p=3228#comment-87734 Silver Nanotechnology Working Group Thu, 04 Mar 2010 18:12:25 +0000 http://www.beyondpesticides.org/dailynewsblog/?p=3228#comment-87734 This is a response to the article on the Toxicity of the Fathead Minnow. Basically, the authors have tested stirred nanoparticles which agglomerate and sonicated nanoparticles, which do not aggregate and have found that the sonicated simple nanopartices are more toxic. Also, they have measurded free Ag ions and found the same amount in both the stirred and the sonicated mediums, but the sonicated medium appears to be more toxic which the authors claim is due to something other then the ions causing the increased toxicity, namely the nanoparticles themselves. As with all the other test tube studies we have seen recently this is a worse case scenario, since sonication does not occur in the natural environment. Nanoparticles will not only agglomerate, but will also attach to other ligands in the water which will neutralize them. Funds for research would be better used to test nanoparticles in the natural environment where the true behavior of these particles can be observed.

Rosalind Volpe, D.PH
Director, SNWG
Silver Nanoparticle Working Group

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