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Abstract:

A time-based flow injection (FI) separation pre-concentration system coupled to an electrothermal atomic absorption spectrometer (graphite furnace) has been developed for the direct ultra-trace determination of selenite and selenate in drinking water. The pre-concentration of both forms of selenium is carried out onto a micro-column packed with an anionic resin (Dowex 1×8) that is placed in the robotic arm of the autosampling device. Selenite and selenate are sequentially eluted with HCl 0.1M and HCl 4M, respectively. The interference of large quantities of chloride during selenium atomisation is prevented by using iridium as a "permanent" chemical modifier. The features of the pre-concentration separation system for both species are: 53% efficiency of retention and an enhancement factor of 82 for a pre-concentration time of 180s (sample flow rate=3mlmin-1) with HCl elution volumes of 100μl. The detection limit (3s) is 10ngl-1 for the two species and the relative standard deviation (n=10) at the 200ngl-1 level is 3.5% for selenite and 5.6% for selenate. The addition of selenite and selenate stock standard solutions to tap water samples yields a 97-103% recovery of both species. © 2003 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Determination of selenite and selenate in drinking water: A fully automatic on-line separation/pre-concentration system coupled to electrothermal atomic spectrometry with permanent chemical modifiers
Autor:Stripeikis, J.; Pedro, J.; Bonivardi, A.; Tudino, M.
Filiación:Lab. de Análisis de Trazas, Depto. Quim. Inorg., Analitica Q., Ciudad Universitaria, 1428 Buenos Aires, Argentina
Departamento de Química, Fac. de Ing. Química, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000 Santa Fe, Argentina
Palabras clave:Drinking water; Electrothermal atomic absorption spectrometry; Flow injection; Permanent modifiers; Selenium speciation; Atomization; Chemical modification; Concentration (process); Negative ions; Potable water; Resins; Robotic arms; Selenium compounds; Separation; Atomic absorption spectrometers; Flow injection (FI); Tap water; Trace analysis; anion exchange resin; chloride; drinking water; graphite; hydrochloric acid; iridium; selenate; selenite; tap water; article; atomic absorption spectrometry; autoanalysis; chemical modification; electrochemical analysis; elution; flow injection analysis; flow rate; furnace; online analysis; priority journal; robotics; water flow; water sampling
Año:2004
Volumen:502
Número:1
Página de inicio:99
Página de fin:105
DOI: http://dx.doi.org/10.1016/j.aca.2003.09.022
Título revista:Analytica Chimica Acta
Título revista abreviado:Anal. Chim. Acta
ISSN:00032670
CODEN:ACACA
CAS:chloride, 16887-00-6; graphite, 7782-42-5; hydrochloric acid, 7647-01-0; iridium, 13967-67-4, 7439-88-5; selenate, 13410-01-0, 14124-68-6; selenite, 14124-67-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032670_v502_n1_p99_Stripeikis

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Citas:

---------- APA ----------
Stripeikis, J., Pedro, J., Bonivardi, A. & Tudino, M. (2004) . Determination of selenite and selenate in drinking water: A fully automatic on-line separation/pre-concentration system coupled to electrothermal atomic spectrometry with permanent chemical modifiers. Analytica Chimica Acta, 502(1), 99-105.
http://dx.doi.org/10.1016/j.aca.2003.09.022
---------- CHICAGO ----------
Stripeikis, J., Pedro, J., Bonivardi, A., Tudino, M. "Determination of selenite and selenate in drinking water: A fully automatic on-line separation/pre-concentration system coupled to electrothermal atomic spectrometry with permanent chemical modifiers" . Analytica Chimica Acta 502, no. 1 (2004) : 99-105.
http://dx.doi.org/10.1016/j.aca.2003.09.022
---------- MLA ----------
Stripeikis, J., Pedro, J., Bonivardi, A., Tudino, M. "Determination of selenite and selenate in drinking water: A fully automatic on-line separation/pre-concentration system coupled to electrothermal atomic spectrometry with permanent chemical modifiers" . Analytica Chimica Acta, vol. 502, no. 1, 2004, pp. 99-105.
http://dx.doi.org/10.1016/j.aca.2003.09.022
---------- VANCOUVER ----------
Stripeikis, J., Pedro, J., Bonivardi, A., Tudino, M. Determination of selenite and selenate in drinking water: A fully automatic on-line separation/pre-concentration system coupled to electrothermal atomic spectrometry with permanent chemical modifiers. Anal. Chim. Acta. 2004;502(1):99-105.
http://dx.doi.org/10.1016/j.aca.2003.09.022