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
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...
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2004
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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032670_v502_n1_p99_Stripeikis http://hdl.handle.net/20.500.12110/paper_00032670_v502_n1_p99_Stripeikis |
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paper:paper_00032670_v502_n1_p99_Stripeikis2023-06-08T14:23:58Z 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 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 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. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032670_v502_n1_p99_Stripeikis http://hdl.handle.net/20.500.12110/paper_00032670_v502_n1_p99_Stripeikis |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
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 |
spellingShingle |
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 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 |
topic_facet |
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 |
description |
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. |
title |
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 |
title_short |
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 |
title_full |
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 |
title_fullStr |
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 |
title_full_unstemmed |
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 |
title_sort |
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 |
publishDate |
2004 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00032670_v502_n1_p99_Stripeikis http://hdl.handle.net/20.500.12110/paper_00032670_v502_n1_p99_Stripeikis |
_version_ |
1768543874217672704 |