What is the chloride tolerance of the different COD Cell Tests and why is the chloride tolerance important?

Under normal circumstances it’s common to find chloride present in all waste water samples. Acids, salts and minerals are used during industrial processes, such as neutralisation of waste water before discharging it to the effluent treatment plant. This can result in a relatively high chloride concentration. A seasonal spike in chloride concentration is also seen in areas where salt is used to increase safety on snow-covered streets.

Since chloride interferes with the measurement of COD, it’s important to measure the chloride level present before choosing a COD test kit. Care should be taken when choosing a COD test kit because many suppliers indicate a tolerance of only 1000 or 1500 mg/l chloride. By choosing a Spectroquant^® COD test kit you’re on the safe side because all of our COD Cell Test kits tolerate 2000 mg/l chloride and some tolerate higher levels. In fact, our new ultra high COD test kit tolerates up to 50,000 mg/l making it ideal for analysis of heavily polluted waste water with extremely high chloride levels.

 Overview of Spectroquant^® COD Test Kits