摘要
采用国家标准重铬酸钾法测定废水化学耗氧量,存在试剂费用高、二次污染严重等缺点,而采用无汞法测定,不仅能够加大反应液中硫酸的浓度,使之达到9 mo1/L,而且能够提高氧化剂重铬酸钾的电极电位,消除Cl-干扰,缩短测定时间,具有较高的实用价值。
There are several disadvantages such as high reagent expenses, serious secondary pollution etc. In the determination of wastewater CODcr using the potassium dichromate method. The non-mercuric method had some advantages which were not only increasing concentration of sulfate that reached to 9 mol/L,but also enhancing the electrode electric potential of the oxidizer, potassium dichromate, eliminating the disturbance from Cl^-,and decreasing the determination time,having a higher practical value.
出处
《煤炭与化工》
CAS
2013年第4期142-143,151,共3页
Coal and Chemical Industry
关键词
无汞法
重铬酸钾法
废水
化学耗氧量
测定
non- mercuric method
potassium dichromate method
wastewater
, chemical oxygen demand
determination
