Crop residue a pollution solution?

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USDA-ARS researchers have discovered that soybean hulls — as well as leftover stalks and stems from corn and sugar cane plants — make an ideal foundation for a potent filtering agent that can adsorb harmful levels of lead, chromium, copper and cadmium from contaminated waters. A two-step process converts the cheap and abundant crop residues into a powerful magnet that removes both positively and negatively charged particles of heavy metals in water for less cost than current technology.

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