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|Título:||Automated solid-phase spectrophotometric system for optosensing of bromate in drinking waters|
|Autor:||Oliveira, Sara M.|
Oliveira, Hugo M.
Segundo, Marcela A.
Rangel, António O. S. S.
Lima, José L. F. C.
|Editora:||Royal Society of Chemistry|
|Citação:||OLIVEIRA, Sara M...[et al.] - Automated solid-phase spectrophotometric system for optosensing of bromate in drinking waters. Analytical Methods. ISSN 1759-9679. Vol. 4, n.º 5 (2012), p. 1229-1236|
|Resumo:||An automated method based on an optosensor included in a multisyringe flow injection system was developed for the determination of bromate in waters for human consumption. The optosensor was based on the formation of a colored radical cation after oxidation of chlorpromazine by bromate and its selective uptake in a mixed-mode cation exchanger sorbent (Discovery DSC-MCAX), placed on a flow-through spectrophotometric cell. In-line regeneration was attained by methanol + 5% (v/v) ammonia, fostering the application of the same sorbent portion up to 180 determinations. Parameters affecting the reaction development and uptake of the colored compound were studied and optimized, while in-line addition of sulfite ($0.100 g L 1) prevented interference from hypochlorite. The proposed methodology allowed the determination of bromate up to 50.0 mg L 1, with 0.9 mg L 1 as the limit of detection, meeting the requirements of current EU and USA legislation. Application to real drinking water samples was successful, with a mean recovery of 100.2 2.8% for spiked levels of 5.0, 10.0 and 25.0 mg L 1. Repeatability was good (RSD < 3.6%, n ¼ 10) with a determination throughput of 8 h 1, fostering the application to on-line control of water disinfection processes.|
|Versão do Editor:||DOI: 10.1039/c2ay05860j|
|Aparece nas colecções:||CBQF - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review|
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