Aqueous hexavalent chromium, Cr(VI),
is rapidly reduced to trivalent
chromium, Cr(III), by exposure to (polystyrylmethyl)trimethylammonium
borohydride and with Amberlite-supported mild bases in a heterogeneous
environment. Post-reaction removal of the insoluble reagents leaves
no remediation-based chemical footprint in the source water. Time
dependence with stirred and static conditions is discussed.
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