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Rustlike Crystals Found to Cleanse Water of Arsenic Cheaply

Even if Mr. Tomson’s cost estimates are correct, researchers still have to demonstrate that the technology can be used safely. For example, no one knows the risks of the arsenic residues’ being consumed by accident or of their leaching from landfills back into water supplies. The first field tests of the material are being planned for Brownsville, Tex., next year, as is a study in India, the researchers said.