Terbium and N,N′,N" tri(3,5 diamino benzenesulfonyl) 1,4,7 triazacyclononane (TDABS Tacn) form a stable chelate having a 1∶1 molar ratio in dilute aqueous solution. The fluorescence property of the chelate was studied under the experimental conditions (pH 8.4 in H 3BO 3 KCl NaOH buffer, λ EX =309 nm, λ EM =374 nm). The fluorescence intensity is a linear function of concentration in the range of 5.0×10 -6 to 4.2×10 -4 mol/L for terbium. The relative standard deviation is less than ±2.0%. When tolerable amount of other metal ions were added to the solution of terbium chelate, the fluorescence intensity can be determined without interference. These results suggest that aromatic armed polyazamacrocycle can be used for the terbium determination.
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