Second Order Reaction Rate Constant Of Ibuprofen With Atrazine Lab Report

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1.1 Kinetic model
To determine the second order reaction rate constant of Acesulfame K with the different transient species studied, two pairs of independent competition kinetics were established for each transient: Acesulfame K with Ibuprofen and Acesulfame K with Atrazine. Assuming the first pair of competition for the hydroxyl radical generated by NaNO3 irradiation is Acesulfame and Ibuprofen (ACE, IBP). Their respective reaction rates are (M s-1): (Eq. 6) (Eq. 7)
With k and k’ the second order reaction rates of Ace and IBP with HO•.
By dividing Equations 6 and 7, the following relation can be obtained: (Eq. 8)
Solving Equation 8 for k, the following expression is obtained: (Eq. 9)
However, it can be approximated that the second order rate constants of Ace and IBP each multiplied by [HO] are their respective first order reaction rate constants: and . By substitution to Equation 9, the following relation is obtained: (Eq. 10)
As the second order reaction rate constant of ibuprofen with HO• can be found in literature, and both first order ones will be estimated experimentally, the second order reaction rate constant of Acesulfame with hydroxyl radicals can then be estimated.
In a similar manner, the calculations for the second pair of competition kinetics for HO•, Acesulfame and Atrazine (ACE, ATR) give: (Eq. 11)
The same reasoning can be applied to the excited triplet state
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