高校实验室废液中Cr(VI)的测定及处理方法

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

高校实验室废液中Cr(VI)的测定及处理方法

Cr(VI)是对环境有害的主要重金属之一，实验室含Cr(VI)废液不能直接排放，必须进行回收处理。采用间接碘量法测
定含Cr(VI)废液的浓度；化学还原法处理含Cr(VI)废液，研究以硫酸亚铁为还原剂还原Cr(VI)废液的酸度条件、还原剂用量、反应时间等影响因素。结果表明：在最佳条件下，以硫酸亚铁为还原剂处理，废液达到了国家排放标准，取得了良好的处理效果。

1．大理学院药学与化学学院，云南大理 671000； 2．大理学院农学与生物科学学院，云南大理 671003

收稿日期:2010-12-28 出版日期:2011-04-01 发布日期:2011-04-01
作者简介:杨志洁，高级实验师，主要从事分析化学教学与研究．

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．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