We investigate the effect of solute concentration on the heterogeneous ice nucleation temperature (T_(het)) of aqueous solutions of both NaCl and D-glucose. An automatic lag time apparatus (ALTA) technique allows the dependence of T_(het) on solute concentration to be determined with statistical significance. Our results point to the solute-induced lowering of T_(het) being a factor of two times the equivalent melting point depression at any fixed concentration, the same factor reported for homogeneous nucleation experiments with small molecular weight solutes.
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