STUDY ON MEAN ACTIVITY C0EFFICIENT OF 5,10,15,20—TETRAKIS PORPHYRIN SODIUM BY FREEZING—POINT DEPRESSION METHOD

摘要

The mean activity cofficient of 5,10,15,20-tetrakis （P-methoxyl-O-sulfophenyl） porphyrin sodium indilute aqueous solution has been determined in the modalityrange 0.00547-0.08871 mol·kg-1at 273.2 K by the freez-ing-point depression method.The results of γ± are 0.9945-0.7695, it is in close agreement with that by isopiesticmethod.