Determinação espectrofotométrica de selênio em rações para animais empregando análise por injeção em fluxo / Spectrophotometric determination of selenium in ration for domestic animals employing flow injection analysis

AUTOR(ES)

Rejane Mara Frizzarin

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

20/10/2008

RESUMO

In this work it was developed an automatic procedure for the determination of selenium in ration for domestic animals digested in acidic medium. The automated method was based on the catalytic effect caused by selenium (IV) on the reaction of ammoniacal iron sulfate with EDTA in medium containing NaNO3. The analytical module was based on multicommuted flow process. Considering that the kinetic of reaction was slow, the analytical module was designed with six reaction coupled in parallel in order to allow that residence time of sample zone was increased up to 5 min without decrease of the analytical throughput. After definition of the system control variables, sample of animal ration mineralized in nitric/perchloric acid medium were processed. The results concerning to standard solution addition assays gave recoveries between the range of 95 % up to 109 %. Other profitable features such as a relative standard deviation of 2 % (n = 8) and an analytical throughput of 60 samples determination per hours were also achieved.

ASSUNTO(S)

espectrofotometria fia fia multicomutação ração animal ration selênio selenium spectrophotometry

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