摘要
采用重铬酸钾法,测定不同回流时间(30~150 min)下不同水样(自来水、劳动湖水、景观用水、游泳池水、生活污水和污水处理厂进口废水)的COD_(Cr)值.结果表明,测定COD_(Cr)时,游泳池中水的回流时间只需30 min;景观用水的回流时间可缩短为75 min;劳动湖水回流时间可缩短为60 min;自来水回流时间可缩短为90 min;污水处理厂进口废水和生活污水的回流时间则仍需保持120 min.可见,对于不同种类水样的COD_(Cr)测定,所需回流时间不同.水质较稳定的水样和水质简单的未经污染的水样的回流时间均可以缩减;水质复杂或不稳定的水样的回流时间与标准法相同即可.
Effect of reflux time on COD_（Cr） of different water samples was analyzed and studied.COD_（Cr） values were determined with reflux time from 30 min to150 min by potassium dichromate method.Water samples include tap water,Labour Lake water,landscape water,swimming pool water,domestic sewage and inlet water of the sewage treatment factory.The results show that the reflux time of water in the swimming pool can be shortened to 30 min, that of landscape water can be done to 75 min,that of Labour Lake water can be reduced to 60 min and tap water can be reduced to 90 min.However,it remains 120 min for inlet water of sewage treatment factory and domestic sewage.It can be concluded that reflux time of COD_（Cr） depends on the types of water samples,reflux time can be reduced for water with more stable and simple composition and nonpolluting,and it still remains 2 h for water with complex and unstable composition.
出处
《高师理科学刊》
2017年第1期45-48,共4页
Journal of Science of Teachers＇College and University
基金
教育部第48批"留学回国人员科研启动基金"资助项目
关键词
化学需氧量
回流时间
不同水样
chemical oxygen demand
reflux time
different water samples
