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• W1972051260 abstract "This paper describes the spectrofluorimetric determination of picogram level Pb(II) using 2,5-dimercapto-1,3,4-thiadiazole (DMT) as a fluorophore. Excitation of DMT at 330 nm shows an emission maximum at 435 nm. The colorless solution of DMT changes into highly emittive yellow color immediately after the addition of 0.5 μM Pb(II) and nearly 245-fold increase in emission intensity at 435 nm was observed. These changes were attributed to the complex formation between Pb(II). The emission intensity linearly increases in the concentration range of 10-100 nM Pb(II) and DMT. Based on the fluorescence enhancement, the concentration of Pb(II) was determined. Interestingly, the emission intensity was increased even in the presence of 0.1 pM Pb(II). The fluorophore showed an extreme selectivity towards 100 nM Pb(II) even in the presence of 50,000-fold higher concentrations of common metal ions interferences such as Na(+), K(+), Ca(2+), Mg(2+), Fe(2+), Cd(2+), Cr(3+), Mn(2+), Zn(2+), Co(2+), Ni(2+) and 5000-, 100- and 40-fold of Cu(2+), Hg(2+) and Ag(+) ions, respectively. The lowest detection of 20 pg L(-1) Pb(II) was achieved for the first time using DMT. The proposed method was successfully utilized for the determination of Pb(II) in tap water, polluted river water and industrial waste water samples. The results obtained in the present study were validated with both AAS and ICP-AES methods." @default.
• W1972051260 created "2016-06-24" @default.
• W1972051260 creator A5013790044 @default.
• W1972051260 creator A5058440662 @default.
• W1972051260 date "2011-11-01" @default.
• W1972051260 modified "2023-09-27" @default.
• W1972051260 title "Spectrofluorimetric determination of picogram level Pb(II) using a dimercaptothiadiazole fluorophore" @default.
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• W1972051260 doi "https://doi.org/10.1016/j.saa.2011.07.026" @default.
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