Solubility and Activity Coefficients of Acidic and Basic Nonelectrolytes in Aqueous Salt Solutions. 1. Solubility and Activity Coefficients of o-Phthalic Acid and L-Cystine in NaCl(aq), (CH3)4NCl(aq), and (C2H5)4NI(aq) at Different Ionic Strengths and at t = 25 °C Bretti, C.; Crea, F.; Foti, C.; Sammartano, S.; Journal of Chemical & Engineering Data 2005, 50, 1761-1767