The two reactions were both sensitive between strontium(II) and dibromo-o-carboxy-chlorophosphonazo (DBKCPA) at pH IO.S as well as between strontium and dibrorno-p-methyl-methlsulfonazo (DBMMSA) at pH 8.S. The klorredion dual-wavelength spectrophotometric method was applied to the determination of properties· of Sr complex solutions because it was able to eliminate the interference of excess ligand in the reaction system. The multi-coordination reaction was found in such a complex system because the complex ratio of Sr(Il) to DBKCPA and to DBMMSA were equal to 1:7 and 1:2 respectively. In addition, this investigation still brought out the easy determination of the stepwise real molar absorptivity (E) and stepwise or cumulative stability constant (K) of Sr·DBKCPA and Sr-DBMMSA complexes.
HONG WEN GAO ,QING SONG YE ,LIN QIAN YU ,
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