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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Publicado: 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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spelling 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