Determination of Sulfate Ion with 2-Aminoperimidine Hydrobromide Using an Optode Based on Tetrabromophenolphthalein Ethyl Ester Membrane

Abstract

An optode method for the determination of sulfate ion was developed. The optode membrane is 2-nitrophenyl octyl ether-plasticized poly(vinyl chloride) membrane containing tetrabromophenolphthalein ethyl ester. The method is based on formation of an ion associate between the excess of 2-aminoperimidine hydrobromide (Ap) and sulfate ion in the sample solution, and detection of the concentration of the remaining Ap ion by the optode. Under the optimal conditions, a good linear relationship was found to exist between the absorbance of the optode membrane, and concentrations of sulfate ion in a concentration range from 20 to 400 μM. The developed optode method was applied to the determination of sulfate ion in environmental water samples.

A simple method for colourimetric determination of silver using a home-made double beam photometer

“…Because of this, they are a suitable choice in process control and analysis of the environmental samples 14 and heavy metals 15 that require quick and easy techniques. Optical sensor-based methods have been used to determine sulfate, 16 zinc, 17 lead, 18 and mercury 19 ions in different environmental samples.…”