Separation of the Nitrogen Isotopes by the Exchange Reaction between Ammonia and Solutions of Ammonium Nitrate

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Abstract
The fractionation factor for the exchange reaction between ammonia and ammonium nitrate was determined as a function of the dissolved ammonia content. It was found that for a stock solution containing 59.3–59.6 percent ammonium nitrate α=−0.029 M+1.034, where α is the fractionation factor at 25°C and M the fraction (Moles NH3)/(Moles NH3+Moles NH4NO3), in solution. From these data, the equilibrium constant for the exchange reaction N 14 H 4 + ( sol )+ N 15 H 3 ( gas )⇌ N 15 H 4 + ( sol )+ N 14 H 3 ( gas ) was calculated to be 1.034, while that for the reaction N 14 H 3 ( sol )+ N 15 H 3 ( gas )⇌ N 15 H 3 ( sol )+ N 14 H 3 ( gas ) was found to be 1.005. Vapor pressure and density data were determined for the ammonia‐ammonium nitrate solutions as a function of the ammonia concentration.

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