The Validity of the Use of Tracers to Follow Chemical Reactions

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Abstract
A rigorous mathematical analysis of differences in chemical properties between isotopic molecules based on specific activities indicates that the max. ratios between specific rate constants of isotopes at 25[degree]C range from 60 for H1/H3 to 1.02 for I127/I131 and p32/p32. The max. isotopic effects in rates of reaction decrease rapidly in going from isotopic compounds of low to those of high atomic number. The isotopic effect decreases as the reaction approaches equilibrium, so that effects are small when an appreciable amt. of substrate has been allowed to react.
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