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 ...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.展开更多
A proper mixture of β-cyclodextrin and sodium dodecylsulfate in aqueous solution was found to show a synergistic enhancement of the fluorescence intensity of 4,5-benzopiaselenol. The determination of trace selenium c...A proper mixture of β-cyclodextrin and sodium dodecylsulfate in aqueous solution was found to show a synergistic enhancement of the fluorescence intensity of 4,5-benzopiaselenol. The determination of trace selenium can be carried out directly in aqueous solution.展开更多
文摘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.
基金Project supported by the National Natural Science Foundation of China.
文摘A proper mixture of β-cyclodextrin and sodium dodecylsulfate in aqueous solution was found to show a synergistic enhancement of the fluorescence intensity of 4,5-benzopiaselenol. The determination of trace selenium can be carried out directly in aqueous solution.
