Why the 'n' value for 1:1 stoichiometry in modified stern volmer plot deviate from one?

11 November 2017 0 7K Report

We plot modified Stern-Volmer eqn to get 'n' value. For 1:1 stoichiometry case, we do not get the exact value of n=1 rather slight less or more than 1. what is actual reason of this deviation?

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