Hello.

One of the methods is (AFNOR 2001): (French Association of Normalization), NF T90-101 for COD.

Best regards.

Try the APHA Standard Methods for the Examination of Water and Wastewater - every good technical library should have a copy

ISO 15705:2002

APHA, 5220 CHEMICAL OXYGEN DEMAND (COD), in Standard Methods for the Examination of Water and Wastewater

ISO 15705:2002

Accurate estimation is actually depend upon the concentration of COD in wastewater sample. If your COD is less than 1000 mg/L, I suggest to instrumental COD digestion method Where you Would require 1-2 mL of sample in instrumental COD tube method. if your COD range is upto 4500 mg/L, I prefer sulphuric acid-dichromate (SAD) digestion method that involves digestion by means of distillation in Sauxlet unit. Similarly, if your COD range is 20,000-250,000 mg/L. I recommend SAD with 20-100 times dilution of the sample. We found a COD range of 247,000 mg/L in pharma wastewater, about 20,000 mg/L in food processing wastewater and upto 6,500 mg/L in tannery wastewater.

Please ignore typing and linguistic errors, as it was done in hurry.

Standard methods APHA, closed reflux method. Appropriate dilution before analysing real industrial wastewater.