帮我用英语写：六价铬被有效去除和还原为了三价铬，有效降低毒性。在沉淀物中也检测到了部分六价铬，是由于氢氧化物沉淀与六价铬离子之间存在络合作用。
Hexavalent chromium was effectively removed and reduced to trivalent chromium, thereby reducing its toxicity. Some hexavalent chromium was also detected in the sediment, which was due to the complexation between the precipitate of hydroxides and hexavalent chromium ions.
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