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HH—1型COD分析仪是基于库仑分析原理设计的。水样在硫酸和重铬酸钾体系中回流消解15分钟,以电解产生的亚铁离子对剩余的重铬酸钾进行库仑滴定。用电位法自动检测终点,直接显示COD值。不需要使用标准溶液,操作简便快速。污水含氯量小于30毫克/升不影响测定,大于此量可用硝酸银消除干扰。
HH-1 COD analyzer is based on Coulomb analysis principle design. Water samples were reflux digested in sulfuric acid and potassium dichromate for 15 minutes, and the remaining potassium dichromate was coulometric titrated with ferrous ions produced by electrolysis. Potential method with automatic detection of the end point, COD value directly. Do not need to use the standard solution, easy to operate fast. Sewage chlorine content of less than 30 mg / l does not affect the determination, greater than this amount can be used to eliminate interference silver nitrate.