Automated solid-phase spectrophotometric system for optosensing of bromate in drinking waters

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Sara M Oliveira (Autor) Outra; Hugo M Oliveira (Autor) Outra; Marcela A Segundo (Autor) FFUP; Antonio O S S Rangel (Autor) Outra; Jose L F C Lima (Autor) FFUP; Victor Cerda (Autor) Outra

Revista

Título: Analytical Methods

Vol. 4

Páginas: 1229-1236

ISSN: 1759-9660

Editora: Royal Society of Chemistry

Indexação

ISI Web of Knowledge - 12 Citações

Scopus - 14 Citações

Classificação Científica

FOS: Ciências agrárias > Outras ciências agrárias

Outras Informações

ID Authenticus: P-002-AK5

DOI: 10.1039/c2ay05860j

Abstract (EN): 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 mu g 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 mu g L-1. Repeatability was good (RSD < 3.6%, n = 10) with a determination throughput of 8 h(-1), fostering the application to on-line control of water disinfection processes.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8