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Taylor and Francis Group, Analytical Letters, 15(35), p. 2565-2576, 2002

DOI: 10.1081/al-120016545

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Determination of trace amount of aluminum in water samples by a fluorescent microscopic self-ordered ring technique

Journal article published in 2 by Zhi Cheng, Mei Kun, Yuan Fang Li, Cheng Zhi Huang, Mei Kun Fan, Yuan Fang Li
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

When a droplet of solution was spotted onto a hydrophobic substrate, a self-ordered ring (SOR) can be formed along the perimeter of the spotted droplet if its contact line can be pinned and the solvent can be evaporated. This phenomenon was applied herein for the determination of trace amounts of aluminum in water samples. When a 0.20 mL droplet of the fluorescent complex of Al(III)–Acid chrome dark blue (ACDB) was spotted to the surface of dimethyl dichlorosilane (DMCS) pretreated glass slide, a SOR with the outer diameter of 1.04 mM and the ring line width of 32 mM can be obtained. Linear response was observed between maximum fluorescence intensity (I max) of the SOR with the content of aluminum in the range of 20–320 fmol (or 1.0–16 Â 10 À7 M), and the limit of determination is 0.41 fmol (or 2.05 Â 10 À9 M) with three folds of signal to noise. Water samples including mineral drink water and river water were determined satisfactorily.