Affiliation:
1. Centro de Ciências Exatas e Tecnológicas, Universidade Federal do Recôncavo da Bahia, Centro, 44380-000 Cruz das Almas BA, Brazil
2. Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Avenida Centenário, 303 São Dimas, 13400 970 Piracicaba SP, Brazil
Abstract
A photometric procedure for the determination ofClO-in tap water employing a miniaturized multicommuted flow analysis setup and an LED-based photometer is described. The analytical procedure was implemented using leucocrystal violet (LCV; 4,4′,4′′-methylidynetris (N,N-dimethylaniline), C25H31N3) as a chromogenic reagent. Solenoid micropumps employed for solutions propelling were assembled together with the photometer in order to compose a compact unit of small dimensions. After control variables optimization, the system was applied for the determination ofClO-in samples of tap water, and aiming accuracy assessment samples were also analyzed using an independent method. Applying the pairedt-test between results obtained using both methods, no significant difference at the 95% confidence level was observed. Other useful features include low reagent consumption, 2.4 μg of LCV per determination, a linear response ranging from 0.02 up to 2.0 mg L−1 ClO-, a relative standard deviation of 1.0% (n=11) for samples containing 0.2 mg L−1 ClO-, a detection limit of 6.0 μg L−1 ClO-, a sampling throughput of 84 determinations per hour, and a waste generation of 432 μL per determination.
Funder
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Subject
Computer Science Applications,Instrumentation,Chemical Engineering (miscellaneous),Analytical Chemistry
Cited by
5 articles.
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