关键词: 六价铬, 总铬, 浸出条件

Abstract: The influences of solid-liquid ratio，time，temperature，and pH etc. on the leaching effect of hexavalent chromium and total chromium in the chromium polluted soil samples were investigated by single factor test.The experimental results showed that with the increase of the solid-liquid ratio，the leaching rate of hexavalent chromium also increased accordingly，but the solid-liquid ratio should not exceed 1∶20；prolong the leaching time was good for the leaching rate of hexavalent chromium，but the leaching time should not exceed 13 h；raise the temperature in a certain range was also good for the leaching rate of hexavalent chromium，but temperature should not over 60 ℃；under the condition of strong acid and strong alkali，they were both conducive to hexavalent chromium leaching.Compared with the strong alkali，strong acid condition of hexavalent chromium leaching effect was better，and leaching rate can reach 87%；the total chromium′s leaching effect following the changes of these factors were not obvious.

Key words: hexavalent chromium, total chromium, leaching conditions