stable peroxide solution for ECL?

[ronnstrand at my-deja.com]

I would like to make a reasonably stable peroxide solution to be used
in enhanced chemiluminescence (ECL) experiments (to be stored in the
refrigerator for, hopefully, months). As I understand urea peroxide
should be a rather stable compound, but in what buffer should I
dissolve it in order to keep it stable (ie, which pH is suitable?)
Grateful for suggestions and comments.
Lars


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