[glengraff]

I've been looking for information on eliminating the interference due to the presence of hydrogen peroxide on the chemical oxygen demand test.  There is nothing in standard methods for the treatment of wastewater.  Does anyone know how to eliminate this interference or a correlation equation in which you can calculate the COD value based on the hydrogen peroxide concentration?

[hande]

I've been looking for information on eliminating the interference due to the presence of hydrogen peroxide on the chemical oxygen demand test.  There is nothing in standard methods for the treatment of wastewater.  Does anyone know how to eliminate this interference or a correlation equation in which you can calculate the COD value based on the hydrogen peroxide concentration?

Hi..

There is an enzyme Catalase (from Micrococcus Iysodiekticus, 1 AU destroys 1 µmol  H2O2 at pH = 7 RTP, 100181 U/mL, Fluka) to destroy residual, unreacted H2O2 order to prevent its positive interference with COD measurements.
Due to the fact that Catalase also contributes to the COD (1.46 mg COD/mL Catalase) and TOC (1.02 mg TOC/mL Catalase) of the samples. A distilled water which includes any H2O2 separate is mixed with exactly the same amount of Catalase that was used to destroy H2O2. This sample is identified as “catalase control samples”.
after havin the results of COD;
"COD of sample-COD of catalase control sample = real COD result of the sample"

hande