$1.00
Description
The NANOCOLOR® COD Tube Test is for the photometric determination of COD.
The chemical oxygen demand of water is determined by silver-catalysed oxidation with potassium dichromate/sulfuric acid at 148°C during a two hour period. Using different chromate concentrations, one can cover different measuring ranges. For COD 40/60/160/300 the colour decrease of the yellow dichromate ions is measured. For COD 600/1500/4000/1000/15000/60000 the colour increase of the green chromium(III) ions formed is evaluated. If the chloride content exceeds 1500 mg/L the sample has to be diluted with COD-free water, or you may use the chloride complexing agent. Lower chloride concentrations are masked by the mercury(II) sulphate present in the test tubes.
Compatible with the following photometers:
