Chemically modified polymeric sorbents for sample preconcentration

León-González, María Eugenia; Pérez-Arribas, L.V.

doi:10.1016/s0021-9673(00)00942-0

Cited by 122 publications

(42 citation statements)

References 35 publications

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“…This has been the subject of numerous papers and reviews related to synthesis, characterization and metal ion uptake studies. [1][2][3][4] The insertion of suitable specific functional groups into solid matrices makes them capable of reacting with metal species under certain favorable conditions to form metal complexes. One of the most used supports is silica gel due to its good mechanical, thermal and chemical stability as well as excellent swelling resistance in different solvents.…”

Section: Introductionmentioning

confidence: 99%

Sorption Behavior of Vanadium on Silica Gel Modified with Tetrakis(4-carboxyphenyl)porphyrin

Pyrzyńska

Wierzbicki

2005

ANAL. SCI.

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IntroductionFor the purpose of separation of metal ions, either for purification or preconcentration, various kinds of chelating resins have been developed. This has been the subject of numerous papers and reviews related to synthesis, characterization and metal ion uptake studies. [1][2][3][4] The insertion of suitable specific functional groups into solid matrices makes them capable of reacting with metal species under certain favorable conditions to form metal complexes. One of the most used supports is silica gel due to its good mechanical, thermal and chemical stability as well as excellent swelling resistance in different solvents. 4,5 Synthesis and application of silica gel phases loaded with various organic reagents for preconcentration of metal ions have been reviewed by Jal et al. 4 Additionally, several new reagents like dimethylglyoxime, 6 4-aminoantipyrene, 7 5-formyl-3-(1′-carboxyphenylazo) salicylic acid, 8 2-aminothiazol 9 and dendrimer-like polyamidoamine 10 have been recently reported for the chemical modification of silica surface.Unfortunately, the modified silica phases have not been studied for selective extraction and enrichment of vanadium. For this purpose chelating resins 11-14 and several modified polymers [15][16][17] have usually been applied. Determination of vanadium at trace levels is important for monitoring pollution as well as for understanding its geochemical and biological effects. However, when the level of this metal in real samples is very low, a preconcentration/separation step is necessary to improve the precision and accuracy.18 Moreover, the procedures based on sorption principles are very useful for separation of vanadium species as V(IV) and V(V), two main forms present in natural waters, which have different nutritional and toxic properties.In the present study, modified silica gel was used for the solid phase extraction of vanadium. Tetrakis(4-carboxyphenyl)-porphyrin (TCPP) was chosen as a complexing reagent as it forms stable complexes with vanadium. Vanadyl porphyrins occur for example in fossil fuels. 19 The silica surface was modified by physical adsorption and by direct chemical immobilization through formation of an amide bond. The resulting chelating sorbents have been studied for separation and preconcentration of vanadium species. Experimental Reagents and apparatusThe chemicals used were of analytical grade, and all solutions were prepared with deionized water obtained from a Milli-Q system (Millipore).A commercial atomic absorption standard solution (Merck) containing 1000 mg L -1 of V(IV) (VOSO4 in 0.5 mol L -1 H2SO4) was used. Vanadium(V) solutions were prepared by dissolving V2O5 in 1% (v/v) HNO3.5,10,15,20-Tetrakis(4-carboxyphenyl)porphyrin (TCPP) from Fluka was used without further purification.A Perkin Elmer Model AAnalyst 300 atomic absorption spectrometer equipped with a deuterium background correction system utilized the vanadium 318.5 nm line. HGA-800 furnace and pyrolytically coated graphite tubes were employed. The instrumental settings...

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Section: Introductionmentioning

confidence: 99%

Sorption Behavior of Vanadium on Silica Gel Modified with Tetrakis(4-carboxyphenyl)porphyrin

Pyrzyńska

Wierzbicki

2005

ANAL. SCI.

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“…Over the years, the performance of SPE-PS-DVB has been enhanced by attaching polar groups (i.e. acetyl, hydroxmethyl, benzoyl, o-carboxybenzoil, sulfonate, trimeth y l a m m o n i u m ) t o t h e a r o m a t i c r i n g o n t h e polymer DVB [23] or by changing the copolymer composition. The SPE-DVB phase modified with o-carboxybenzoyl was useful applied for the determination of pesticides and phenolic compounds in environmental waters.…”

Section: Spe Sorbentsmentioning

confidence: 99%

Current Trends in Sample Treatment Techniques for Environmental and Food Analysis

Lucci¹,

Pacetti²,

Núñez³

et al. 2012

Chromatography - The Most Versatile Method of Chemical Analysis

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“…14 Several works reported the use of solid-phase micro extraction and SPE with different sorbents such as alkylbonded silica, 15 graphitized carbon black (GCB) 16 and styrene-divinylbenzene resins. 17 Recent studies on the use of surfactant-coated mineral oxides columns for SPE have demonstrated that these new sorbent materials are promising tools for the extraction/preconcentration of organic compounds in a wide polarity range. [18][19][20][21] Adsorption of ionic surfactants on mineral oxides is a cooperative process; firstly, a monolayer of surfactant (i.e.…”

Section: Introductionmentioning

confidence: 99%

Sodium dodecyl sulfate-coated alumina and C18 cartridge for the separation and preconcentration of cationic surfactants prior to their quantitation by spectrophotometric method

Karimi

Behjatmanesh–Ardakani

Goudi

et al. 2008

J. Braz. Chem. Soc.

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Um novo método de extração em fase sólida foi desenvolvido para separar e pré-concentrar traços de tensoativos catiônicos, tais como, brometo de dodeciltrimetilamônio (DTAB), brometo de cetiltrimetilamônio (CTAB) e cloreto de cetilpiridínio (CPC). Esse método é baseado na sorção do tensoativo aniônico (AS − ), dodecilssulfato de sódio (SDS), sobre a superfície de γ-alumina, enquanto um cartucho C 18 é utilizado para a pré-concentração dos tensoativos catiônicos (CS + ). O método espectrofotométrico, utilizado para a determinação dos tensoativos catiônicos, baseia-se na competição entre o corante catiônico, azul de metileno (MB + ), e o CS + , para associação e formação do complexo SDS. O íon complexo formado (MB + ) pode ser quantitativamente substituído pelo CS + , levando a um aumento da absorvância medida em 662 nm. Foram estabelecidas ótimas condições experimentais para a separação, pré-concentração e determinação dos tensoativos catiônicos. Sob essas condições otimizadas, realizou-se a pré-concentração (2×) e os resultados mostraram que a determinação do CPC, DTAB e CTAB poderia ser realizada nas faixas de concentração de 1×10 -5 -2×10 -4 , 4×10 -5 -5×10 -4 and 5×10 -5 -5×10 -4 mol L -1 , respectivamente. Por fim, a partir de onze determinações de 10,0 mg mL -1 das soluções de CPC, DTAB e CTAB obtiveram-se RSDs de 4,3, 3,7 e 4,0%, respectivamente. O método foi validado por meio de um conjunto de diferentes amostras que continham os tensoativos catiônicos.A new solid phase extraction method has been developed to the separation and preconcentration of trace amounts of cationic surfactants i.e. dodecyltrimethylammonium bromide (DTAB), cetyltrimethylammonium bromide (CTAB) and cetylpyridinium chloride (CPC). This method is based on the sorption of anionic surfactant (AS -) of sodium dodecyl sulfate (SDS) on the γ-alumina surface and C 18 cartridge is used for preconcentration of cationic surfactants (CS + ). Spectrophotometric determination method used for the determination of cationic surfactants is based on the competition between the cationic dye of methylene blue (MB + ) and CS + for association complex formation with SDS. The MB + in the ion associate complex can be quantitatively substituted by CS + leading to an increase in the absorbance measured at 662 nm. Optimum experimental conditions for separation, preconcentration and determination of cationic surfactants have been reported. Under the selected optimal conditions, preconcentration factor of two-fold was achieved and the results showed that determination of CPC, DTAB and CTAB could be performed in concentration ranges of 1×10 -5 -2×10 -4 , 4×10 -5 -5×10 -4 and 5×10 -5 -5×10 -4 mol L -1 , respectively. Eleven determinations of 10.0 mg mL -1 of CPC, DTAB and CTAB solutions led to RSD's of 4.3, 3.7 and 4.0%, respectively. Method was validated using a set of different samples containing cationic surfactants.

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Chemically modified polymeric sorbents for sample preconcentration

Cited by 122 publications

References 35 publications

Sorption Behavior of Vanadium on Silica Gel Modified with Tetrakis(4-carboxyphenyl)porphyrin

Sorption Behavior of Vanadium on Silica Gel Modified with Tetrakis(4-carboxyphenyl)porphyrin

Current Trends in Sample Treatment Techniques for Environmental and Food Analysis

Sodium dodecyl sulfate-coated alumina and C18 cartridge for the separation and preconcentration of cationic surfactants prior to their quantitation by spectrophotometric method

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