Abstract
An indirect colorimetric method is presented for detection of trace amounts of hydroquinone (1), catechol (2) and pyrogallol (3). The reduction of AuCl 4 − to Gold nanoparticles (Au-NPs) by these phenolic compounds in the presence of cetyltrimethylammonium chloride (CTAC) produced very intense surface plasmon resonance peak of Au-NPs. The plasmon absorbance of Au-NPs allows the quantitative colorimetric detection of the phenolic compounds. The calibration curves derived from the changes in absorbance at λ = 568 nm were linear with concentration of hydroquinone, catechol and pyrogallol in the range of 7.0 × 10 −7 to 1.0 × 10 −4M, 6.0 × 10 −6 to 2.0 × 10 −4 M and 6.0 × 10 −7 to 1.0 × 10 −4 M, respectively. The detection limits were 5.3 × 10 −7, 2.5 × 10 −6 and 3.2 × 10 −7 M for the hydroquinone, catechol and pyrogallol, respectively. The method was applied satisfactorily to the determination of phenolic compounds in water samples and pharmaceutical formulations.
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More From: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
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