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Spectroquant® test kits for COD analysis in waste water

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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

 COD measurement range (mg/l)Accuracy (absolute value in mg/l)Chloride tolerance (mg/l)Merck Millipore
item  number
Recommended use

  new

4.0 to 40
5.0 to 80.0
1.5
1.5
2,000
2,000
1.14560.0001
1.01796.0001
Analysis of relatively clean water such as drinking, ground and surface water or extensively treated waste water
  10 to 150
15 to 300
50 to 500
7
8
13
2,000
2,000
2,000
1.14540.0001
1.14895.0001
1.14690.0001
Analysis of ground water, surface water, treated waste water
  25 to 1,500
300 to 3,500
30
70
2,000
2,500
1.14541.0001
1.14691.0001
Analysis of untreated waste water, polluted surface or ground water
  500 to 10,000
150
5,000 1.14555.0001 Analysis of polluted untreated water
new 5,000 to 90,000
1321
50,000 1.01797.0001 Analysis of very polluted untreated water that contains up to 50,000 mg/l chloride

© Merck KGaA, Darmstadt, Germany, 2014


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