Abstract
The aim of this work was the development of an automatic sequential injection analysis method to monitor the ozonation process for water disinfection. The determination was based on the reaction between bromate and o-dianisidine in the presence of bromide in acidic medium. The determination parameters were studied and adjusted to enable bromate quantification in the range 0.35–4.0 mg BrO3−/L with a limit of detection of 20 μg BrO3−/L. The choice of a sequential injection procedure enabled a minimal consumption of reagents and no need for sample pre-treatment. The developed sequential injection proved to be accurate with < 5% relative deviation when compared to ICP-MS and an average of 101% in recovery percentages studies. It was effectively applied to monitor an ozonation process enabling the follow-up of the process with real-time quantification of the bromate content.
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Acknowledgements
This work was funded by FEDER through project reference POCI-01-0145-FEDER-031522 (Programa Operacional Competitividade e Internacionalização) and by National Funds from FCT (Fundação para a Ciência e Tecnologia); scientific collaboration from FCT project UID/Multi/50016/2020 is also acknowledged.
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Advanced Publication Released Online by J-STAGE December 17, 2021.
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In the supporting information are shown the results of the reaction kinetics studies, both the studies made in a batch-wise procedure and the calibration curves established for different reaction time (in batch-wise and flow procedure) (DOCX 29 KB)
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Mesquita, R.B.R., Ferreira, F.T.S.M., Cerqueira, A. et al. Sequential injection spectrophotometric method for screening bromate produced as an ozonation water disinfection by-product. ANAL. SCI. 38, 137–143 (2022). https://doi.org/10.2116/analsci.21P191
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DOI: https://doi.org/10.2116/analsci.21P191