Determination of As(III) in nonacidified groundwater samples for inorganic speciation analysis using flow injection hydride generation atomic absorption spectrometry

A flow injection system coupled to hydride generation atomic absorption spectrometry with heated quartz tube atomizer was employed for the selective determination of As(III) in real groundwater samples under nonacidic conditions. The use of low-acidity conditions was carefully evaluated in order to...

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Autores principales: Sigrist, M., Beldoménico, H., Tudino, M.
Formato: JOUR
Materias:
Arsenic speciation
Atomic absorption spectrometry
Flow injection
Hydride generation
Nonacidified water samples
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00387010_v43_n6_p458_Sigrist
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00387010_v43_n6_p458_Sigrist2023-10-03T14:49:13Z Determination of As(III) in nonacidified groundwater samples for inorganic speciation analysis using flow injection hydride generation atomic absorption spectrometry Sigrist, M. Beldoménico, H. Tudino, M. Arsenic speciation Atomic absorption spectrometry Flow injection Hydride generation Nonacidified water samples A flow injection system coupled to hydride generation atomic absorption spectrometry with heated quartz tube atomizer was employed for the selective determination of As(III) in real groundwater samples under nonacidic conditions. The use of low-acidity conditions was carefully evaluated in order to minimize the interconversion of redox arsenic species. The As(III) hydride was generated using 0.1 mol L-1 HCl as carrier solution and 0.2% (m/v) NaBH4 in 0.025% NaOH as the reductant. A coil reaction larger than the used one for higher acidity conditions (480 mm instead of 115 mm) was selected. The generated hydride was transported to the atomizer by a nitrogen flow of 75 ml min-1. The main parameters that influenced the signal intensity and shape were studied. Under the best found experimental conditions, a detection limit (3σ) of 1.0 μgL-1 As(III) was obtained for a 500 μl sample volume. The analytical recovery ranged between 90% and 98%. In addition, the total inorganic arsenic concentration in the samples was determined on sample aliquots acidified with concentrated HCl and prereduced with 5% (m/v) KI-5% (m/v) C6H8O6 solution. HCl 1.2 mol L-1 as carrier solution, NaBH4 0.2% (m/v) as reductant, and a nitrogen flow rate of 75 ml min-1 were used in this case. The concentration of As(V) was calculated by difference between the total inorganic arsenic and As(III) concentrations. © Taylor & Francis Group, LLC. Fil:Sigrist, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tudino, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00387010_v43_n6_p458_Sigrist
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Arsenic speciation
Atomic absorption spectrometry
Flow injection
Hydride generation
Nonacidified water samples
spellingShingle Arsenic speciation
Atomic absorption spectrometry
Flow injection
Hydride generation
Nonacidified water samples
Sigrist, M.
Beldoménico, H.
Tudino, M.
Determination of As(III) in nonacidified groundwater samples for inorganic speciation analysis using flow injection hydride generation atomic absorption spectrometry
topic_facet Arsenic speciation
Atomic absorption spectrometry
Flow injection
Hydride generation
Nonacidified water samples
description A flow injection system coupled to hydride generation atomic absorption spectrometry with heated quartz tube atomizer was employed for the selective determination of As(III) in real groundwater samples under nonacidic conditions. The use of low-acidity conditions was carefully evaluated in order to minimize the interconversion of redox arsenic species. The As(III) hydride was generated using 0.1 mol L-1 HCl as carrier solution and 0.2% (m/v) NaBH4 in 0.025% NaOH as the reductant. A coil reaction larger than the used one for higher acidity conditions (480 mm instead of 115 mm) was selected. The generated hydride was transported to the atomizer by a nitrogen flow of 75 ml min-1. The main parameters that influenced the signal intensity and shape were studied. Under the best found experimental conditions, a detection limit (3σ) of 1.0 μgL-1 As(III) was obtained for a 500 μl sample volume. The analytical recovery ranged between 90% and 98%. In addition, the total inorganic arsenic concentration in the samples was determined on sample aliquots acidified with concentrated HCl and prereduced with 5% (m/v) KI-5% (m/v) C6H8O6 solution. HCl 1.2 mol L-1 as carrier solution, NaBH4 0.2% (m/v) as reductant, and a nitrogen flow rate of 75 ml min-1 were used in this case. The concentration of As(V) was calculated by difference between the total inorganic arsenic and As(III) concentrations. © Taylor & Francis Group, LLC.
format JOUR
author Sigrist, M.
Beldoménico, H.
Tudino, M.
author_facet Sigrist, M.
Beldoménico, H.
Tudino, M.
author_sort Sigrist, M.
title Determination of As(III) in nonacidified groundwater samples for inorganic speciation analysis using flow injection hydride generation atomic absorption spectrometry
title_short Determination of As(III) in nonacidified groundwater samples for inorganic speciation analysis using flow injection hydride generation atomic absorption spectrometry
title_full Determination of As(III) in nonacidified groundwater samples for inorganic speciation analysis using flow injection hydride generation atomic absorption spectrometry
title_fullStr Determination of As(III) in nonacidified groundwater samples for inorganic speciation analysis using flow injection hydride generation atomic absorption spectrometry
title_full_unstemmed Determination of As(III) in nonacidified groundwater samples for inorganic speciation analysis using flow injection hydride generation atomic absorption spectrometry
title_sort determination of as(iii) in nonacidified groundwater samples for inorganic speciation analysis using flow injection hydride generation atomic absorption spectrometry
url http://hdl.handle.net/20.500.12110/paper_00387010_v43_n6_p458_Sigrist
work_keys_str_mv AT sigristm determinationofasiiiinnonacidifiedgroundwatersamplesforinorganicspeciationanalysisusingflowinjectionhydridegenerationatomicabsorptionspectrometry
AT beldomenicoh determinationofasiiiinnonacidifiedgroundwatersamplesforinorganicspeciationanalysisusingflowinjectionhydridegenerationatomicabsorptionspectrometry
AT tudinom determinationofasiiiinnonacidifiedgroundwatersamplesforinorganicspeciationanalysisusingflowinjectionhydridegenerationatomicabsorptionspectrometry
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