Attia M S, Youssef A O, Elgazwy Abdel-Sattar S H, El Abady Samia A, Agami Samia M, Elewa Safaa I
Analytical Chemistry Division, Faculty of Science, Ain Shams University, Cairo, Egypt,
J Fluoresc. 2014 May;24(3):759-65. doi: 10.1007/s10895-014-1349-4. Epub 2014 Feb 5.
The sensitization of the excited triplet state of a novel symmetrical Bis(dialkylamino)phenoxazinium salt was developed in the presence of Hg(2+). This effect was used to determine the concentration of Hg(2+) in different water samples. The phenoxazinium salt sensor was characterized by different spectroscopic tools such as: UV, FTIR, NMR and fluorescence spectra. The sensor has an emission band at 347 nm in DMSO. Hg(2+) in DMSO at pH 5.6 can remarkably quench the fluorescence intensity of the sensor at 347 nm and a new band was appeared at 436 nm due to the strong complex formation between Hg(2+) and sensor. The quenching of the band intensity at 347 and the enhancement of the intensity of the new band at 436 were used to determine the Hg(2+) in different waste water samples. The dynamic range found for the determination of Hg(2+) concentration is 8.7 × 10(-10) - 1.4 × 10(-6) mol L(-1) with a detection limit of 5.8 × 10(-10) mol L(-1) and quantification detection limit of 1.8 × 10(-9) mol L(-1).
在汞离子（Hg(2+)）存在的情况下，开发了一种新型对称双（二烷基氨基）吩恶嗪盐激发三重态的敏化作用。这种效应被用于测定不同水样中Hg(2+)的浓度。通过紫外光谱（UV）、傅里叶变换红外光谱（FTIR）、核磁共振光谱（NMR）和荧光光谱等不同光谱工具对吩恶嗪盐传感器进行了表征。该传感器在二甲基亚砜（DMSO）中的发射带位于347 nm。在pH 5.6的DMSO中，Hg(2+)能显著猝灭传感器在347 nm处的荧光强度，并且由于Hg(2+)与传感器之间形成强配合物，在436 nm处出现了一个新的谱带。利用347 nm处谱带强度的猝灭和436 nm处新谱带强度的增强来测定不同废水样品中的Hg(2+)。测定Hg(2+)浓度的动态范围为8.7×10(-10) - 1.4×10(-6) mol L(-1)，检测限为5.8×10(-10) mol L(-1)，定量检测限为1.8×10(-9) mol L(-1)。
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