QuickCODlab

QuickCODlab - Reagent free COD analysis in the Laboratory

COD analysis schematic

QuickCOD lab - Measurement Principle

 

The industry standard COD analysis lab test , based on dichromate oxidation in the presence of silver sulphate, sulphuric acid and mercuric chloride, takes 2 hours to give a result. The chemical cocktail presents Health & Safety issues, particularly with disposal, and there is talk of a European wide ban on its use at some stage in the near future.

The QuickCOD lab is a laboratory version of the proven High Temp oxidation method incorporated within the QuickCOD analysers available from LAR for process measurements.

COD analysis using high temp oxidisation

The sample is injected into the reactor using a precision syringe.

This simple method is easy to follow, and allows different sample volumes to be analysed accurately

The advantages include:

  • Accurate measure of real COD analysis, rather than a correlation to an alternative
  • No chemical usage/cost
  • Wide measuring ranges
  • Measurement within 3 minutes
  • No reagents needed , only a CO2 free gas source such as Nitrogen
  • No Catalyst needed

High temperature combustion. The clean alternative.

COD analysis without reagents

The analytical compartment is separated from the electronics and is simple to operate and maintain.

 

LAR's COD procedure is based on the thermal oxidation of the sample at 1,200°C, with subsequent detection of the oxygen consumption. This method (ASTM D6238-98) has been employed hundreds of times in the field of online monitoring and has been specially developed further for use in the laboratory.
The crucial point with QuickCODlab: The high-temperature procedure developed by LAR enables the reliable oxidization of all the organic compounds in the sample at a temperature of 1,200°C. The procedure does not need any catalysts or other hazardous or corrosive reagents. Furthermore, the measurement results are free of chloride interferences due to the unique process management. The homogenized sample is injected directly into the reactor where it is completely oxidised and accurately analysed with an O2 detector.

Very high salt concentrations. No problem.

The QuickCODlab can easily cope with salt concentrations of up to 10 g/l, and even up to 300 g/l of sodium chloride (NaCl) with the additional high salt option. The salts move through the oven and are carried out of the system together with the condensate finally being collected as solids in a special retaining device.

This means that no salt residues can form in the oven and the sample does not have to be diluted, even at the highest of salt concentrations. This, in turn, has a positive effect on the accuracy of the measurements.

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