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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 H3BO3-KCl-NaOH buffer, λEX=309 nm, λEM=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.