Immobilisation of analytical reagents on support surfaces

Zaporozhets, Olga A.; Gaver, Olesya M; Сухан, В. В.

doi:10.1070/rc1997v066n07abeh000296

Cited by 48 publications

(11 citation statements)

References 31 publications

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“…These sorbents include supramolecular structures of the host ± guest type, and particularly, a large number of adsorbents obtained by non-covalent immobilization of organic compounds on the silica surface. 6 At present, another area of the chemistry of siliconcontaining sorption materials is under active development; this is creation of highly selective adsorbents on the basis of polymeric systems structurally adjustable to the target sorbate at the nanolevel, i.e., so-called imprinted polymers, which are produced by the method of molecular imprinting. 7 To prepare these adsorbents, silicas are often used as a matrix, whereas organosilicon compounds of the general formula X 3 SiR [X = Hal, OR H or OC(O)R H , where R is a carbofunctional organic substituent] serve as binding agents.…”

Section: Introductionmentioning

confidence: 99%

Organosilicon ion-exchange and complexing adsorbents

Власова¹,

Оборина²,

Grigoryeva³

et al. 2013

Russ. Chem. Rev.

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Data on the ion-exchange and complexing orga-Data on the ion-exchange and complexing organosilicon adsorbents published during the last 10 ± 12 years, nosilicon adsorbents published during the last 10 ± 12 years, including the results of systematic research of the authors, including the results of systematic research of the authors, are summarized and analyzed. The following types of are summarized and analyzed. The following types of substances are considered: silicas with covalently grafted substances are considered: silicas with covalently grafted modifiers, silicas and aluminosilicates with non-covalently modifiers, silicas and aluminosilicates with non-covalently grafted modifiers and carbofunctional polyorganylsilses-grafted modifiers and carbofunctional polyorganylsilsesquioxanes prepared by polycondensation of appropriate quioxanes prepared by polycondensation of appropriate organosilicon monomers. Adsorbents of these types find organosilicon monomers. Adsorbents of these types find extensive practical use, in particular, as analytical reagents extensive practical use, in particular, as analytical reagents for determination of metals in natural and artificial speci-for determination of metals in natural and artificial specimens, agents for isolation of valuable elements from indus-mens, agents for isolation of valuable elements from industrial wastes and agents for removal of especially hazardous trial wastes and agents for removal of especially hazardous components from wastes and effluents. The bibliography components from wastes and effluents. The bibliography includes 109 references includes 109 references. .

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Section: Introductionmentioning

confidence: 99%

Organosilicon ion-exchange and complexing adsorbents

Власова¹,

Оборина²,

Grigoryeva³

et al. 2013

Russ. Chem. Rev.

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“…Concentrates may be analyzed in the laboratory if necessary [7]. Silicas modified by adsorbed analytical reagents are found to be environmentally friendly and cost effective tools for analytical sampling and sensitive detection of various compounds in complicated objects [7,8,9,10,11,12]. These kinds of sorbent are suitable for the preconcentration of metal ions due to their high adsorptive and kinetic properties [11].…”

Section: Introductionmentioning

confidence: 99%

Solid-phase reagent for molecular spectroscopic determination of heavy metal speciation in natural water

Linnik

Zaporozhets

2003

Anal Bioanal Chem

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A solid-phase reagent based on 1-(4-adamantyl-2-thiasolylazo)-2-naphthol adsorbed onto silica gel was prepared for Co(II) recovery and preconcentration prior to its sorption-spectroscopic detection. The immobilized reagent was applied to the determination of free cobalt ions in natural water. The solid-phase reagent and chemiluminescent method coupled with membrane filtration, gel-permeation and ion-exchange chromatography were applied to the study of the speciation of iron and cobalt in water from the Dnieper reservoirs and lakes of Kyiv City; their predominant forms were complexes of Fe(III) and Co(II) with dissolved organic matter and fulvic acids play a main role in their complexation.

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“…This is fully justified because both the sensitivity and selectivity of the determination of elements on solid phase are as a rule higher than in solution. The corresponding complication of analysis is insignificant [4,5].The sorption of lanthanum, terbium, and erbium complexes with arsenazo II, arsenazo III, carboxyarsenazo III, and chlorophosphonazo III on the solid phase of ion exchangers and silica gel was studied in [6]. It was noted that the complexes were not adsorbed on the KU-2 cation exchanger and the adsorbates exhibited no bright color on the AV-17 anion exchanger.…”

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confidence: 99%

Lanthanum complexation with reagents of the arsenazo III group on the solid phase of fibrous ion exchangers

2005

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Interest in the development of methods for the determination of actinides and lanthanides in natural and industrial samples remains constant. In aqueous solutions, heavy transuranium elements occur predominantly in a trivalent state and are close to lanthanides in chemical properties. Rare-earth elements (REEs) are uranium concomitants, and their content in the diagnostics of uranium products must be controlled. The development of sorption-spectroscopic and test methods based on highly effective organic reagents and polymeric substrates is favorable to solving these important problems.Alizarin S, pyrocatechol violet, bromopyrogallol red, and arsenazo I, recommended in the literature for the determination of REEs, form complex compounds with lanthanides in a neutral medium. The complexation of reagents of the group of bisazosubstituted chromotropic acids with REEs proceeds in an acid medium and is characterized by significantly higher molar extinction coefficients. With arsenazo III, lanthanides form green complexes at pH 2-3 with an absorption maximum at 650-655 nm, the ratio Me : R = 1 : 1, and ε ~ (6-7) × 10 4 [1, 2]. Arsenazo I, arsenazo III, arsenazo M, and orthanilic A were used in the determination of REEs by spectrophotometry, spectrophotometric titration with an EDTA solution, and differential spectrophotometry. Procedures were developed for the determination of both two-component mixtures and total REE content [3].Sorption-spectrophotometric and test methods for the determination of element ions with organic reagents are being increasingly used in analytical chemistry. This is fully justified because both the sensitivity and selectivity of the determination of elements on solid phase are as a rule higher than in solution. The corresponding complication of analysis is insignificant [4,5].The sorption of lanthanum, terbium, and erbium complexes with arsenazo II, arsenazo III, carboxyarsenazo III, and chlorophosphonazo III on the solid phase of ion exchangers and silica gel was studied in [6]. It was noted that the complexes were not adsorbed on the KU-2 cation exchanger and the adsorbates exhibited no bright color on the AV-17 anion exchanger. The color of the adsorbates on the Silokhrom S-120 silica gel was insufficiently saturated, and only the presence of tetrabutylammonium bromide made the reactions of REEs on the silica gel solid phase sufficiently sensitive. At pH > 5.0-5.5, silanol groups of the substrate dissociated and the sorption of complexes formed at pH > 5 became impossible. The effect of doubling the functional analytical group of the reagents, being pronounced for solutions, became even more substantial for adsorbates. It was noted that the use of reactions on solid phase and colorimetric characteristics significantly improved the sensitivity of determination as compared to the sensitivity of REE determination in solutions.Fibrous ion exchangers are rather convenient, mechanically and chemically stable materials that can be used as the solid phase in sorption-spectroscopic and test methods ...

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Immobilisation of analytical reagents on support surfaces

Cited by 48 publications

References 31 publications

Organosilicon ion-exchange and complexing adsorbents

Organosilicon ion-exchange and complexing adsorbents

Solid-phase reagent for molecular spectroscopic determination of heavy metal speciation in natural water

Lanthanum complexation with reagents of the arsenazo III group on the solid phase of fibrous ion exchangers

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