J4 ›› 2011, Vol. 10 ›› Issue (4): 41-42.

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Determination and Treatment Methods of Cr(VI)in College Laboratory Waste Water

Abstract]Chromium Cr(VI)is a kind of heavy metal which is harmful for the enviroment，therefore，the waste liquid containing Cr(VI)in the laboratory should be treated for recycling instead of being discharged directly．In this paper，we applied the indirect iodometric method to determine the concentration of Cr(vI)with chemical reduction using ferrous sulfate heptahydrate，and investigate the elfeet of acidity condition，reductant quantity and reaction time of this reducing agent．The results showed that the concentration of Cr(VI)after treatment with ferrous sulfate heptahydrate in a certain condition meet the discharge standard．Ferrous sulfate can be used as
reducing agent in recycling of waste liquid contained Cr(VI)in the laboratory．   

  1. 1．College of Pharmacy and Chemistry，Dali University，Dali，Yunnan 67 1000，China； 2．College of Agriculture and Biology Sciences，Dali University，Dali，Yunnan 671003，China
  • Received:2010-12-28 Online:2011-04-01 Published:2011-04-01

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Abstract:

Abstract]Chromium Cr(VI)is a kind of heavy metal which is harmful for the enviroment，therefore，the waste liquid containing Cr(VI)in the laboratory should be treated for recycling instead of being discharged directly．In this paper，we applied the indirect iodometric method to determine the concentration of Cr(vI)with chemical reduction using ferrous sulfate heptahydrate，and investigate the elfeet of acidity condition，reductant quantity and reaction time of this reducing agent．The results showed that the concentration of Cr(VI)after treatment with ferrous sulfate heptahydrate in a certain condition meet the discharge standard．Ferrous sulfate can be used as
reducing agent in recycling of waste liquid contained Cr(VI)in the laboratory．

Key words: ferous sulfate, Cr(VI), reduction, laboratory Cr(VI) waste water

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