Composite materials based on hybrid mesoporous solids for flow-through determination of ultratrace levels of Cd(ii)

In this work we present a solid phase extraction (SPE) flow-through system coupled to graphite furnace atomic absorption spectrometry (GFAAS) for the determination of Cd(ii) at ultratrace levels. The flow system holds a minicolumn which was filled, one at a time, with three different lab-made materi...

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Detalles Bibliográficos
Publicado: 2018
Materias:
Absorption spectroscopy
Adsorption
Atomic absorption spectrometry
Chlorine compounds
Hybrid materials
Mesoporous materials
Metal ions
Metals
Phase separation
Silica
Trace analysis
Adsorption capacities
Electrothermal atomizer
Flow-through systems
Graphite furnace atomic absorption spectrometry
Limit of quantifications
Operational variables
Poly (vinyl alcohol) (PVA)
Solid-phase extraction
Cadmium compounds
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17599660_v10_n26_p3144_Minaberry
http://hdl.handle.net/20.500.12110/paper_17599660_v10_n26_p3144_Minaberry
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_17599660_v10_n26_p3144_Minaberry
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spelling paper:paper_17599660_v10_n26_p3144_Minaberry2023-06-08T16:29:03Z Composite materials based on hybrid mesoporous solids for flow-through determination of ultratrace levels of Cd(ii) Absorption spectroscopy Adsorption Atomic absorption spectrometry Chlorine compounds Hybrid materials Mesoporous materials Metal ions Metals Phase separation Silica Trace analysis Adsorption capacities Electrothermal atomizer Flow-through systems Graphite furnace atomic absorption spectrometry Limit of quantifications Operational variables Poly (vinyl alcohol) (PVA) Solid-phase extraction Cadmium compounds In this work we present a solid phase extraction (SPE) flow-through system coupled to graphite furnace atomic absorption spectrometry (GFAAS) for the determination of Cd(ii) at ultratrace levels. The flow system holds a minicolumn which was filled, one at a time, with three different lab-made materials: (a) mesoporous silica functionalized with 3-aminopropyl groups from 3-aminopropyl triethoxysilane (HMS); (b) HMS with a resin, Amberlite IR120; and (c) HMS-Amberlite IR120 and polyvinyl alcohol (PVA). All the solids were characterized by FTIR and SEM. Batch experiments were performed in order to study the optimum adsorption pH, the adsorption kinetics and the maximum adsorption capacity. The materials were compared in terms of their aptitude for the pre-concentration of the analyte under dynamic conditions. Microvolumes of HCl were employed for the release of cadmium and its introduction into the electrothermal atomizer. The operational variables of the flow system were also tested and optimized. A comparison of the figures of merit revealed that HMS-A-PVA was the best option from an analytical point of view: limit of detection = 4.7 ng L-1, limit of quantification = 16 ng L-1, RSD% = 4 (n = 6, 100 ng L-1), linear range: from LOQ up to 200 ng L-1 and a lifetime of over 600 cycles with no obstructions to the free movement of fluids, material bleeding or changes in the analytical sensitivity. The proposed method was shown to be tolerant to several ions typically present in natural waters and was successfully applied to the determination of traces of Cd(ii) in real samples. A full discussion of the main findings with emphasis on the metal ion/filling interaction is provided. © 2018 The Royal Society of Chemistry. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17599660_v10_n26_p3144_Minaberry http://hdl.handle.net/20.500.12110/paper_17599660_v10_n26_p3144_Minaberry
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Absorption spectroscopy
Adsorption
Atomic absorption spectrometry
Chlorine compounds
Hybrid materials
Mesoporous materials
Metal ions
Metals
Phase separation
Silica
Trace analysis
Adsorption capacities
Electrothermal atomizer
Flow-through systems
Graphite furnace atomic absorption spectrometry
Limit of quantifications
Operational variables
Poly (vinyl alcohol) (PVA)
Solid-phase extraction
Cadmium compounds
spellingShingle Absorption spectroscopy
Adsorption
Atomic absorption spectrometry
Chlorine compounds
Hybrid materials
Mesoporous materials
Metal ions
Metals
Phase separation
Silica
Trace analysis
Adsorption capacities
Electrothermal atomizer
Flow-through systems
Graphite furnace atomic absorption spectrometry
Limit of quantifications
Operational variables
Poly (vinyl alcohol) (PVA)
Solid-phase extraction
Cadmium compounds
Composite materials based on hybrid mesoporous solids for flow-through determination of ultratrace levels of Cd(ii)
topic_facet Absorption spectroscopy
Adsorption
Atomic absorption spectrometry
Chlorine compounds
Hybrid materials
Mesoporous materials
Metal ions
Metals
Phase separation
Silica
Trace analysis
Adsorption capacities
Electrothermal atomizer
Flow-through systems
Graphite furnace atomic absorption spectrometry
Limit of quantifications
Operational variables
Poly (vinyl alcohol) (PVA)
Solid-phase extraction
Cadmium compounds
description In this work we present a solid phase extraction (SPE) flow-through system coupled to graphite furnace atomic absorption spectrometry (GFAAS) for the determination of Cd(ii) at ultratrace levels. The flow system holds a minicolumn which was filled, one at a time, with three different lab-made materials: (a) mesoporous silica functionalized with 3-aminopropyl groups from 3-aminopropyl triethoxysilane (HMS); (b) HMS with a resin, Amberlite IR120; and (c) HMS-Amberlite IR120 and polyvinyl alcohol (PVA). All the solids were characterized by FTIR and SEM. Batch experiments were performed in order to study the optimum adsorption pH, the adsorption kinetics and the maximum adsorption capacity. The materials were compared in terms of their aptitude for the pre-concentration of the analyte under dynamic conditions. Microvolumes of HCl were employed for the release of cadmium and its introduction into the electrothermal atomizer. The operational variables of the flow system were also tested and optimized. A comparison of the figures of merit revealed that HMS-A-PVA was the best option from an analytical point of view: limit of detection = 4.7 ng L-1, limit of quantification = 16 ng L-1, RSD% = 4 (n = 6, 100 ng L-1), linear range: from LOQ up to 200 ng L-1 and a lifetime of over 600 cycles with no obstructions to the free movement of fluids, material bleeding or changes in the analytical sensitivity. The proposed method was shown to be tolerant to several ions typically present in natural waters and was successfully applied to the determination of traces of Cd(ii) in real samples. A full discussion of the main findings with emphasis on the metal ion/filling interaction is provided. © 2018 The Royal Society of Chemistry.
title Composite materials based on hybrid mesoporous solids for flow-through determination of ultratrace levels of Cd(ii)
title_short Composite materials based on hybrid mesoporous solids for flow-through determination of ultratrace levels of Cd(ii)
title_full Composite materials based on hybrid mesoporous solids for flow-through determination of ultratrace levels of Cd(ii)
title_fullStr Composite materials based on hybrid mesoporous solids for flow-through determination of ultratrace levels of Cd(ii)
title_full_unstemmed Composite materials based on hybrid mesoporous solids for flow-through determination of ultratrace levels of Cd(ii)
title_sort composite materials based on hybrid mesoporous solids for flow-through determination of ultratrace levels of cd(ii)
publishDate 2018
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17599660_v10_n26_p3144_Minaberry
http://hdl.handle.net/20.500.12110/paper_17599660_v10_n26_p3144_Minaberry
_version_ 1768543629269270528

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