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** Reaction rate constants and regression **

Table 1. Reaction rate constant k (M s ) and regression coefficient r of fumigants and ammonium thiosulfate in aqueous phase at 20°C (28) |

Table 23.1 HMF formation kinetics in isothermal heating as a function of treatment temperature, first order reaction pseudo rate constant and regression coefficients |

Both the and the coefficients in the linear combination relations are functions of the rate constants, through the matrix transformations. Obviously, Eq. 1.6.2-1 is enormously isier to use in determination of the than the full solutions for the y which consist of Af-exponential terms, and which would require nonlinear regression techniques. In foct, simple logarithmic plots, as just described, can be used. Once the straight-line reaction paths are used to determine the numerical matrix manipulations can then be used to readily recover the kj,. [Pg.47]

Oxygenation of 2-substituted adamantanes with methyl(trifluoromethyl)dioxirane showed a reaction constant, p = -2.31, consistent with a strongly electron-demanding transition state. Analysis of the effect of solvents on the rate yielded a positive regression coefficient with Dimroth-Reichardt Ej solvent polarity parameter. A mechanism involving an electrophilic O atom insertion has been postulated for the formation of alcohols and carbonyl compounds.201 [Pg.107]

Note the use of activities, as well as of an equilibrium constant based on activities. The kinetic constants for autocatalyzed and catalyzed reactions, k and k, were determined from initial reaction rates with liquid activity coefficients calculated by UNIQUAC. Near chemical equilibrium the fCT is about 6, while Kx is about 5. Table 8.7 gives activation energies and pre-exponential factors obtained by nonlinear regression. The simulation shows tbat the autocatalysis effect is neghgible below 150 °C, but it might increase to 20% at 180 °C. [Pg.242]

The rate of H2Oz consumption and the OH production were directly related to total iron concentration. The concentrations of hydroxyl radical produced were controlled by the rate of reaction with dissolved constituents. Rate constants for adsorption (ka) and desorption (kd) of PCBs from particles were calculated by regression of data from 1.5 to 5 hr. Adsorption rate constants were estimated from Equation (6.130) assuming that the partitioning rate constants between 2 and 5 hr without OH could be used for calculation of equilibrium partition coefficients Ky) [Pg.223]

** Reaction rate constants and regression **

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