Spectrophotometric Determination of Trace Amount of Fluoride by New Eco-friendly Colorimetric Chemosensor Based on Al-Bromopyrogallol Red Complex

Document Type : Original Article

Authors

1 Department of Chemistry, Payame Noor University, P. O. Box 19395-4697 Tehran, Iran

2 Departments of Chemistry, Firoozabad Branch, Islamic Azad University, Firoozabad, Iran

Abstract

In this research, a new and environmentally friendly chemical sensor was introduced using Bromopyrogallol red (BPR) to determine trace amounts of aluminum and fluoride ions in dimethyl sulfoxide/water (5.5, v/v) solvent. The results showed that the color of BPR changes from red to violet under the influence of visible light in the presence of aluminum ions. This chemical sensor can selectively detect aluminum with a detection limit 2.21×10-7 and quantitation limit 7.37×10-7 mol L−1. Upon addition of aluminum ion, the absorbance signal of [Al-BPR] increased linearly in the concentration range of 1.60×10−6 - 8.06×10−5 mol L−1. In addition, [Al–BPR] complex can be used for the determination of F-. The signal of [Al-BPR] upon addition of F- decreased linearly in the concentration range of 4.0×10-5 - 8.80×10-4 -. The relative standard deviation (RSD) for 5 times of measurement (n=5) in two concentrations of 1.87×10-5 and 3.07×10-5 mol L−1 of aluminum are 2.9% and 2.1% respectively. To determine the stoichiometry of the reaction between BPR receptor and aluminum ion, the molar ratio method was used. According to the experiments, this ratio was determined to be 1:1. BPR can also be used to detect aluminum ions in different water samples with high recovery percentage.

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Applied Chemistry Today
Volume 19, Issue 72
September 2024
Pages 37-54

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