A rapid and sensitive spectrofluorometric method for the determination of Au(III) based on fluorescence quenching of a 1,3,5-triphenyl-2-pyrazoline
A simple, rapid, sensitive, and low-cost
spectrofluorometric method was developed for the determination of Au(III)
using
5-(2,3-dimethoxyphenyl)-3-(4-methoxyphenyl)-1-phenyl-4,5-dihydro-1H-pyrazole
(L) in ethanol/water. The method is based on the change in the
fluorescence intensity at 464 nm after excitation at 355 nm as a result of
the reaction between the ligand and Au(III). The fluorescent emission of
ligand at 464 nm decreased with the increasing of Au(III) concentration. The
ligand concentration, pH effect, response time, and effect of foreign ions
were determined. From the results of fluorescence titration experiments, it
was found that the ligand (1 ××\times 10−7−7^{-7} M) was selective and
sensitive to Au(III) in EtOH-H22_{2}O (1:1, v/v, phthalate buffer, pH 4.0).
The calibration curve showed good linearity in the concentration range of
17.4-237.6 μμ\mu g L−1−1^{-1} Au(III). The limits of detection and
quantification were 5.2 and 17.4 μμ\mu g L−1−1^{-1} Au(III) with a response
time of 1 min, respectively. Satisfactory accuracy was obtained for standard
reference material (CRM-SA-C Sandy Soil C). The proposed method was
successfully applied to the determination of Au(III) in tap water, sea
water, and stream water samples, and high levels of recovery were obtained.
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