13-03E

Using the collective variables method we study the effect of Coulomb interactions on the Ginzburg temperature of ionic fluids. For the charge-asymmetric primitive model with additional short-range attractive interactions in the vicinity of the gas-liquid critical point, we derive the effective Landau-Ginzburg Hamiltonian. We obtain the explicit expressions for all the Hamiltonian coefficients within the framework of the one-loop approximation. We obtain the reduced Ginzburg temperature $t_{G}$ for the restricted primitive model to be about $20$ times smaller than for the nonionic model. For the full model including both the short-range attractive and long-range Coulomb interactions, we show that $t_{G}$ approaches the value found for the pure Coulombic model when the strength of the Coulomb interactions becomes large enough.