China is one of major countries to produce chromate and the annual output of chromate was more than 160 thousand tons. However, a large amount of chromium-containing slag was discharged from chromate industries. The accumulated amount of chromium-containing slag was more than 4 million tons and 600 thousand tons are being discharged annually. Dissolvable hexavalent chromium (Cr(VI)) accounting for 0.3～1.5% of slag can be leached into soils and groundwater by rainfall and runoff, which incurs a signif...
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