GB/T 22597-2014 "Determination of Chemical Oxygen Demand in Reclaimed Water—Potassium Dichromate Method" specifies the method for determining the chemical oxygen demand (COD) in reclaimed water using the potassium dichromate method. This standard method involves oxidizing the reducing substances in the water sample with potassium dichromate in a strong acidic medium. The excess potassium dichromate is back-titrated with a standard solution of ammonium ferrous sulfate using ferroin as an indicator. The chemical oxygen demand value of the water sample is then calculated based on the amount of potassium dichromate consumed.
This summary is not the original standard text and is for reference only. For accurate information, please obtain it through official channels.
| Status | Active | ||
|---|---|---|---|
| CCS | G76 | ICS | 71.040.40 |
| Release Date | 2014-12-05 00:00:00 | Implementation Date | 2015-05-01 00:00:00 |
