The toxicity of chromium is related to its oxidation states, and the primary typical pollutant in chromium-containing electroplating waste water is hexavalent chromium.The recent advancement of the relevant study on hexavalent chromium pollution in electroplating waste water is reviewed.The main sources of hexavalent chromium in aquatic environment are analyzed.The research situation on the toxicity of hexavalent chromium on aquatic plants and animals is surveyed, including the accumulation and distribution of hexavalent chromium in organism after absorption and the induced morphologic, biochemical and ultrastructural damage.Some common kinds of treatment of hexavalent chromium contaminated electroplating waste water are introduced, emphasizing on the advantages of biological chromium reduction new technology and its perspective in the future.Finally the development trend of replacement of hexavalent chromium plating is presented.
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