Abstract: Hexavalent chromium（Cr⁶⁺） determination，and extraction protocols from chromite ore processing residue （COPR），and the evaluation of the harmlessness measures of COPR were reviewed.Problems of some Cr⁶⁺ leaching protocols of COPR were pointed out by referring to quite a lot of related publications at home and abroad.As the strong alkali and the great acid neutralization capability of COPR，many so-called Cr⁶⁺ acid solution extractions are untrue.USEPA Method 3060A leaches much more Cr⁶⁺ than the diluted aqueous solutions of sulfuric acid, nitric acid or hydrochloric acid.HJ/T 299—2007 and HJ/T 300—2007 methods can not determine genuine Cr⁶⁺ content of the treated COPR.GB 5085.3—2007 has flaws for evaluating the leaching toxicity of COPR.Best choice for determining Cr⁶⁺ content of COPR is physical analysis, such as X-ray absorption near-edge structure analysis；and it′s better to leach Cr⁶⁺ from COPR by USEPA Method 3060A.

Key words: chromite ore processing residue, hexavalent chromium, leaching method, detoxification evaluation