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toxic substances separating ating agent set

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Description: August 6, 2013 On May 9, 2013, EPA received a petition from J. William Hirzy, Ph.D., Chemist in Residence, with American University, requesting that EPA take action under section 6 of the Toxic Substances Control Act TSCA to prohibit the use of hydrofluorosilicic acid HFSA as a water fluoridation agent.

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