Beneficial Effect of Immobilization On the Characteristics of A Spectrofluormetric Reagent For Aluminum

Rigid immobilization of 2,2′,4-trihydroxyazo-benzene on triazine modified cellulose is shown to extend the pH range over which this ligand forms a fluorescent complex with Al +3 In the nonimmobilized form a nonfluorescent two-to-one complex competes with the fluorescent one-to-one complex and is favored under neutral conditions. the substrate and immobilization linkage used here are demonstrated to be sufficiently rigid to inhibit the formation of the spectroscopically undesirable bis complex. This phenomenon increases the potential applicability of the ligand as a spectrofluorometric reagent for Al +3 . This result should be generally applicable to other photometric reagents where the mono complex is the analytically desirable form and where the potential application of the reagent is to optical methods employing immobilized reagents.