Initial effect on ORP with H2O2

[JonasRoman]

Question to Randy:

H2O2 is an oxidation agent , well so far i am sure, and subsequently it should have an increasing effect on ORP i assume..Am i correct so far?
Now to my question: I have heard from one aquarist that the initial effect with adding H2O2 is a decrease in ORP!!...is that really correct?, and how in earth is that possible if that is true??
Have you any comments on this?

Thanks in advance
Jonas Roman

 

[twilliard]

Question to Randy:

H2O2 is an oxidation agent , well so far i am sure, and subsequently it should have an increasing effect on ORP i assume..Am i correct so far?
Now to my question: I have heard from one aquarist that the initial effect with adding H2O2 is a decrease in ORP!!...is that really correct?, and how in earth is that possible if that is true??
Have you any comments on this?

Thanks in advance
Jonas Roman

This is true it does drop

 

[JonasRoman]

This is true it does drop

ok, but why? as it is an oxidizing agent this must be some only initial artifact-effect? And do anyone in that case have an explanation?. I assume that the effect is rapid and the you will see the increase? And, is this observation only found when you dose in aquarium or even when you dose in a sample of water and measure outside aquarium?

 

[Randy Holmes-Farley Verified Community Expert]

We discussed this a few times. Unless there's an inhibitor in it which is redox active, there's no pure inorganic chemical reason that I know of for ORP to drop, so I suspect it is bacteria or other organisms being broken open and spilling low ORP contents.

 

[JonasRoman]

We discussed this a few times. Unless there's an inhibitor in it which is redox active, there's no pure inorganic chemical reason that I know of for ORP to drop, so I suspect it is bacteria or other organisms being broken open and spilling low ORP contents.

Thanks Randy, this confirm what i suspected, that there is somewhat a "false" drop in that case and maybe it will not drop always..i guess, and then i also guess that if i will do this test with water outside the aquarium i will probably see the expected increase directly. Thanks for answer, and i will do some experiments, have H2O2 on my job, so if someone here is interested i can be back:_)

 

[Randy Holmes-Farley Verified Community Expert]

Might stick the probe right in the peroxide and see what it reads.

 

[JonasRoman]

Might stick the probe right in the peroxide and see what it reads.

yes i will do that, and i will also take a sample of aquarium water in a bucket and add H2O2 and read the values over time. I also do it with different types of water, RO, etc. I will be back with results:_)

 

[fab]

Following to see your experiment s' results.
fab