Share The Wealth by Chris Gupta
October 16, 2007

Water Treatment With Silcofluorides And Lead Toxicity

Thanks Michael, for bringing this to my attention. Here is a letter that I sent in response.

Letters can be send via

London's Water director Pat McNally's solution to add Sodium hydroxide (LFP October 20, 2007) to reduce lead levels has overlooked a major factor.

Many may not know that London has been putting a non pharmaceutical grade chemical called silcofluoride in water that already contains impurities such as lead and arsenic. While the quantities of these contaminants may look low they are cumulative and are a violation of the Safe Water Act. There are two published studies by Masters and Coplan (1999, 2000)* of considerable importance. Masters and Coplan found a significant increase in children's blood lead (2 times for whites and 6 times for blacks) in both Massachusetts and New York associated with the use of this chemical that is used to fluoridate water.

Sodium hydroxide will do nothing to remove lead contributed from silcofluorides and its ability exacerbates the problem from other sources. Should he not be removing this contaminant first before adding more chemicals to the water?

*Masters RD, Coplan M. 1999 Water treatment with silcofluorides and lead toxicity.
International Journal of Environmental Science 56: 435-449.

Masters RD, Coplan MJ, Hone BT, Dykes JF. 2000 Association of silicofluoride treated water with elevated blood lead. Neurotoxicology 21(6): 1091-1100.

Chris Gupta

At 08:40 2007-10-20, Michael Weare wrote:

Hi Chris

I just read an article in the London Free Press stating that London will be adding sodium hydroxide to our drinking water in an attempt to reduce lead levels. I am wondering what your take is on this? Here is the article from the LFP. City Of London To Add Sodium Hydroxide To Our Drinking Water.

Here is an article from this spring of lye being added to drinking water that did not turn out so well.



posted by Chris Gupta on Tuesday October 16 2007
updated on Sunday October 21 2007

URL of this article:



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