摘要
本文主要研究重铬酸钾法测定化学耗氧量中缩短回流时间的可行性及氯离子的干扰情况与消除干扰的HgSO_4加入量。本结果可解决污水样保存时间和回流时间的矛盾,能较真实地反映水样的化学耗氧量值;严格控制HgSO_4用量可减免二次污染。
The feasibility of shoftening the time of rcfux in chemical oxygendemand(COD)and the interfcfence of chloridc ion and the quantity of HgSo4addcd to dis-pel it are studicd here,which can not only be applied to so1ve the contradiction between thetime to preserve polluted water samplc and the time of renux,but a1so rcnect the COD val-ue in the water samDlc clearly.As a result,the second—time poIIution can be redced andthe environment can be easily administered by controIling the quantity of hgSo_4sirictly.
关键词
重铬酸钾法
化学耗氧量
污水监测
chemical oxygen dcmand(COD),reflux,interference limit
