Spectrophotometric determination of traces of selenium(IV) in various environmental samples using the flow-injection technique (FIT)

A highly selective and sensitive spectrophotometric method for the determination of selenium using 2-hydroxy-1-napthaldehyde-orthoaminophenol

“…Many sophisticated techniques, such as neutron activation analysis (NAA), 7 X-ray uorescence, 8 pulse polarography, 9 inductively coupled plasma optical emission spectrophotometry (ICP-OES), 10 catalytic kinetic spectrophotometric methods, 11 automated hydride generation atomic absorption spectrophotometry (AHG-AAS), 12 high-performance liquid chromatography (HPLC), 13 graphite furnace atomic absorption spectrophotometry (GF-AAS) 14 and spectrouorimetry 15 have been widely applied to the determination of selenium. For this reason, a wide variety of spectrophotometric methods [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] for the determination of selenium has been developed. GF-AAS 14 is oen lacking in sensitivity due to sublimation at high temperature.…”

“…GF-AAS 14 is oen lacking in sensitivity due to sublimation at high temperature. A composition of a few selected methods, [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] their spectral characteristics and drawbacks are summarized for comparison. Catalytic spectrophotometric 11 and spectrouorimetric 15 methods are sensitive but are generally lacking simplicity.…”

“…Catalytic spectrophotometric 11 and spectrouorimetric 15 methods are sensitive but are generally lacking simplicity. The method possesses distinct advantages over existing methods [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] with respect to sensitivity, selectivity, the range of determination, simplicity, toxicity, speed, the pH/ acidity range, thermal stability, accuracy, precision and ease of operation. For this reason, a wide variety of spectrophotometric methods [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] for the determination of selenium has been developed.…”

Determinação espectrofotométrica de selênio em rações para animais empregando análise por injeção em fluxo

“…Os compostos de selênio são usados para descolorir pigmentos esverdeados em vidros, na fabricação de tintas e também para gerar a cor vermelho-rubi vista em sinais de advertência e luzes nas traseiras de automóveis. O selênio é largamente distribuído na natureza em concentrações relativamente baixas em rochas, solos, plantas, carvão e outros combustíveis fósseis (REKHA et al, 2006).…”

“…O efeito tóxico do selênio foi observado em gado que comia determinados tipos de plantas. O selênio representa um papel essencial no ciclo de vida de plantas que absorvem os compostos orgânicos contendo selênio acumulados nas terras de áreas semi-áridas (REKHA et al, 2006). Os animais que pastavam apresentaram inflamação nos pés e supuração da pele na junta do casco, causando a perda do casco e a morte (SMITH et al, 1974).…”