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

• Type: Article in International Scientific Journal
• Date: 2012

Authors

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

Journal

Title: Analytical Methods

Vol. 4

Pages: 1229-1236

ISSN: 1759-9660

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 12 Citations

Scopus - 14 Citations

Scientific classification

FOS: Agrarian Sciences > Other Agrarian Sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8