I want to determine rate of Fenton reaction with different concentration of $\ce{Fe^2+}$. These are some questions that I have encountered:
How long does it usually take for the reaction to complete?
What concentration of $\ce{Fe^2+}$ is usually used for the reaction?
I am planning to use titration of $\ce{H2O2}$ with $\ce{KMnO4}$ to determine the rate of reaction. Is it possible to quench to reaction mixture by adding an excess of EDTA solution and would it affect the titration?
NEW:
How can I determine the rate of Fenton reaction? I proposed to titrate $\ce{H2O2}$ with $\ce{KMnO4}$ to determine change in $\ce{H2O2}$ as a mean of determining rate of reaction. However, I realised that $\ce{KMnO4}$ would also react with $\ce{Fe2+}$, so I need to either find another way to measure the reaction rate or find a way to remove all $\ce{Fe2+}$. Also, I am not sure if there would be any reaction between $\ce{KMnO4}$ and the hydroxyl radicals.
I am also wondering about adding in some wastewater and determine the before and after COD to determine the rate of reaction. However, I am wondering if the water that don't really have high COD (as opposed to the industrial wastes used in other papers) would result in a very slow reaction rate. Also, it seems like the part involving oxidizing by hydroxyl radicals is very exothermic. If I don't want to add $\ce{H2O2}$ bit by bit to control rate of reaction, is it OK?
Do I have to add acid to $\ce{Fe2+}$ and $\ce{H2O2}$ for the reaction to occur?
Is it necessary to add $\ce{H2O2}$ bit by bit, if so how much should I add at each turn?