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"Analysis for COD"
April 2, 2016
Q. How to check raw water chemical oxygen demand? Tell me analytical process, sir.dinesh kumar
engineer - Bhopal , madhyapradesh , India
A. Hi Dinesh. Please review the relevant article in Wikipedia =>
for an overview of the subject, and then obtain ISO 6060 [affil. link to spec at Techstreet] which is the specific instructions for the analysis, and then get back to us with any questions. Good luck.
Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey
April 6, 2016
A. DO must be field measured in-situ. Samples taken and sent to a lab will not yield the correct results.Lyle Kirman
consultant - Cleveland Heights, Ohio
April 9, 2016
A. COD is measured in two ways: you can cook the wastewater up with a dichromate/sulfuric acid solution (plus a pinch of mercury), then determine the result via colorimetry; or, you can do it up in a similar solution, reflux, then backtitrate the excess dichromate with thiosulfate or freshly standardized ferrous ammonium sulfate solution. The latter is more precise.
Dissolved oxygen is not the parameter being measured. One does that via Winkler titration (preferable) or electrode.
Consultant - The Bronx, New York
June 23, 2016
The COD can also be removed with a hook and line...
apologies, I couldn't resist.
- fog encircled rock in the irish sea