Abstract
An optode method for the determination of sulfate ion was developed. The optode membrane is 2-nitrophenyl octyl etherplasticized 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.
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Masadome, T., Ishikawa, H. Determination of Sulfate Ion with 2-Aminoperimidine Hydrobromide Using an Optode Based on Tetrabromophenolphthalein Ethyl Ester Membrane. ANAL. SCI. 34, 383–385 (2018). https://doi.org/10.2116/analsci.34.383
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DOI: https://doi.org/10.2116/analsci.34.383