I'll be carrying a Fenton reaction and I will be taking around 5 samples in the duration of the reaction. I would like to quench the reaction in the samples until I make TOC, COD and other analyses without affecting it. Total number of samples at a time would be 15, as I will be having 3 parallel cells. What should I use as quencher?
Best regards,
Omar
Hi.
Basically, remove the peroxide. Here's info on how to do it: Article A New Method for Removal of Hydrogen Peroxide Interference i...
By the way, you really need to do it or the remaining peroxide will increase the COD values.
Cheers
If it is homogeneous Fenton's process, two options could be used: (i) removing H2O2 by adding small quantity of sodium sulfite (Na2SO3) (conc. of around 30 mM) should be enough and (ii) precipitating the catalysts by adding strong base. The aim of both method is to remove one of the Fenton's reagents, which will immediately halt the reaction.
Thank you all for the answers. It seems Na2CO3 would be the best option. If I find a better option I will share.
by the way, if somebody want to quench the persulfate, and subsequently test the cod or toc, what should he do ?
Hi you might find the data below useful. The mechanism of how the quencher works is that the quenchers will react rapidly with the residual peroxide. This effectively stops the Fenton's process. 3 commonly used quencher were evaluated for cost, performance and also COD contribution. Sodium sulfite, bovin liver and also sodium thiosulphate was tested. Sodium sulfite was shown to be the most cost effective and efficient in quenching residual peroxide. You may refer below for the quantity of quencher needed as well. Hope this helps. cheers. :D
Experiment Findings Residual Peroxide from Fenton process and a study to evaluat...
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