Smart Materials in Speciation Analysis

Karadjova, Irina; Yordanova, Tanya; Dakova, Ivanka; Vasileva, Penka

doi:10.1002/9781119422587.ch24

Cited by 4 publications

(4 citation statements)

References 139 publications

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“…The application of ion-imprinted polymers (IIPs) as sorbents for elemental speciation analysis attracts extensive research interest due to their advantages, such as selectivity, stability, ease of preparation, low cost, and reusability [ 9 ]. Several Cr(III)-IIPs have been studied and characterized as effective sorbents in non-chromatographic speciation analysis of chromium [ 10 , 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Cr(III) Ion-Imprinted Hydrogel Membrane for Chromium Speciation Analysis in Water Samples

Dakova

Vasileva

Karadjova

2022

Gels

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Novel Cr(III)-imprinted poly(vinyl alcohol)/sodium alginate/AuNPs hydrogel membranes (Cr(III)-IIMs) were obtained and characterized and further applied as a sorbent for chromium speciation in waters. Cr(III)-IIMs were prepared via solution blending method using blends of poly(vinyl alcohol) and sodium alginate as film-forming materials, poly(ethylene glycol) as a porogen agent, sodium alginate stabilized gold nanoparticles (SA-AuNPs) as a crosslinking and mechanically stabilizing component, and Cr(III) ions as a template species. The physicochemical characteristics of pre-synthesized AuNPs and obtained hydrogel membranes Cr(III)-IIM were studied by UV-vis and FTIR spectroscopy, TEM and SEM observations, N2 adsorption–desorption measurements, and XRD analysis. The mechanism of the adsorption process toward Cr(III) was best described by pseudo-first-order kinetic and Langmuir models. Experiments performed showed that quantitative retention of Cr(III) is attained in 20 h at pH 6 and temperature 40 °C. Under the same conditions, the adsorption of Cr(VI) is below 5%. A simple and sensitive analytical procedure was developed for the speciation of Cr in an aquatic environment using dispersive solid phase extraction of Cr(III) by Cr(III)-IIM prior to selective Cr(VI) measurement by ETAAS in the supernatants. The detection limits and reproducibility achieved for the Cr speciation analysis fulfill the requirements for their monitoring in waters under the demand of the Water Framework Directive.

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Section: Introductionmentioning

confidence: 99%

Cr(III) Ion-Imprinted Hydrogel Membrane for Chromium Speciation Analysis in Water Samples

Dakova

Vasileva

Karadjova

2022

Gels

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“…Part 1 of volume 2 consists of seven chapters, five of which are devoted to an analytical procedure (SPE, SPME chromatography, CE, immunoassay, and LDI-MS) and three to broader topics (miniaturization in sample handling and preparation, immunoassays, and trace element determination/speciation). This latter chapter consists of several sections (19 pages) devoted to various sorts of nanomaterials, a section on ion-imprinted polymers and several subsections devoted to speciation of the following elements: As and Sb, Cr, Hg, Se, Sn, Tl and V. 7 Speciation of a subset of these elements (As, Cr, Hg) by “sensing probes” takes up a further 8 pages. Part 2 of the second volume consists of chapters devoted to the analysis of particular sample types (water, food, clinical, pharmaceutical and forensic), but it is not clear whether any elemental speciation topics are included in these sections.…”

Section: Topical Reviewsmentioning

confidence: 99%

Atomic spectrometry update: review of advances in elemental speciation

Clough

Harrington

Hill

et al. 2020

J. Anal. At. Spectrom.

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“…with subsequent changes in their properties, including the affinity of the polymeric matrix for the template. 5,6 Generally, the procedure of ion imprinting involves polymerization of a prepolymerization complex of functional monomer with a template (metal ions or their complexes with specific ligands) in the presence of a crosslinking monomer. 7 Subsequent removal of the imprinted ion leaves cavities with a size, shape and chemical functionality complementary to those of the template species.…”

Section: Introductionmentioning

confidence: 99%

“…Highly selective ion‐imprinted polymers (IIPs) are synthetic ‘smart’ materials that combine the selective recognition properties for a template ionic species with the ability to respond to specific external changes (such as the presence of other ions, pH, magnetic field etc.) with subsequent changes in their properties, including the affinity of the polymeric matrix for the template 5,6 . Generally, the procedure of ion imprinting involves polymerization of a prepolymerization complex of functional monomer with a template (metal ions or their complexes with specific ligands) in the presence of a crosslinking monomer 7 .…”

Section: Introductionmentioning

confidence: 99%

Fe(II)ion‐imprinted copolymer gels − smart materials for Fe(II)/Fe(III) speciation in surface waters

Dakova

Mitreva

Karadjova

2021

Polymer International

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The effect of template species -Fe(II) complexes with 4-(2-pyridylazo)resorcinol or 2,2 0 -bipyridine as well as the functional monomers: acidic (methacrylic acid) and neutral (hydroxyethyl methacrylate) on the extraction efficiency and applicability of Fe(II) ion-imprinted polymers for iron speciation in surface waters is presented in this study. The polymers were synthesized by precipitation copolymerization of functional monomer, trimethylolpropane trimethacrylate (crosslinking agent) and 2,2 0 -azo-bis-isobutyronitrile (initiator) in the presence of template and characterized by elemental microanalysis, SEM and Brunauer-Emmett-Teller analyses. Extraction efficiency was examined by batch solid-phase extraction. The equilibrium experimental data of adsorption processes with different synthesized sorbents were fitted by both Langmuir and Freundlich isotherms and are discussed from the viewpoint of possible bond formation between monomer and template species and the stability of the prepolymerization complex. Pseudo-first-order and pseudo-second-order kinetic models were tested to elucidate the possible controlling mechanism of the sorption process for different sorbents. Under the optimum conditions pH 7 and equilibrium time of 30 min the highest extraction efficiency and selectivity toward Fe(II) was achieved for Fe(II) ion-imprinted polymer containing methacrylic acid and Fe(II)-4-(2-pyridylazo)resorcinol complex as a template. The analytical procedure for Fe speciation was developed and validated with this sorbent.

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Smart Materials in Speciation Analysis

Cited by 4 publications

References 139 publications

Cr(III) Ion-Imprinted Hydrogel Membrane for Chromium Speciation Analysis in Water Samples

Cr(III) Ion-Imprinted Hydrogel Membrane for Chromium Speciation Analysis in Water Samples

Atomic spectrometry update: review of advances in elemental speciation

Fe(II)ion‐imprinted copolymer gels − smart materials for Fe(II)/Fe(III) speciation in surface waters

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