On-line Preconcentration and Determination of Zn in Natural Water Samples Employing a Styrene-Divinylbenzene Functionalized Resin and Flame Atomic Absorption Spectrometry

Cassella, Ricardo J.; Magalhães, Otto I.B.; Couto, Marcos Tadeu; Lima, Edson L. S.; Neves, Marcelo A. S.; Coutinho, Fernanda M. B.

doi:10.2116/analsci.21.939

Cited by 12 publications

(4 citation statements)

References 29 publications

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“…There are four XO entities present at the four tetrahedral corners of central Si , −NN− groups are the exchange sites, and the pH of the influent solution is an important controlling parameter in the sorption process. 27 The systematic extraction chromatographic studies on Zn(II) with FSG-XO at the pH range 3.5 to 7.5 ensured its quantitative extraction at the optimum pH 7.0 ± 0.5 in 0.1 M hexamine buffer (see Supporting Information Figure S7). The retention (mg g −1 ) increases with the increase in pH, reaches a maximum at the range 6.5 to 7.5, and then decreases with further increase in pH.…”

Section: Resultsmentioning

confidence: 99%

“…Here, −COOH, −SO 3 2– , −NN– groups are the exchange sites, and the pH of the influent solution is an important controlling parameter in the sorption process . The systematic extraction chromatographic studies on Zn(II) with FSG-XO at the pH range 3.5 to 7.5 ensured its quantitative extraction at the optimum pH 7.0 ± 0.5 in 0.1 M hexamine buffer (see Supporting Information Figure S7).…”

Section: Resultsmentioning

confidence: 99%

“…However, the toxicity of zinc, due to excessive intake, may lead to electrolyte imbalance, nausea, and lethargy. , In view of the essentiality, extensive application, toxicity, and hazard of Zn(II), monitoring it poses a challenging problem to the analytical chemists . The silica membrane disk modified by chelating agents ( N , N ′-disalicylidene-1,2-phenylendiamine) and styrene–divinylbenzene resin functionalized with ( S )-2-[hydroxyl-bis(4-vinylphenyl)methyl]pyrrolidine-1-carboxylic acid ethyl ester for selective extraction, preconcentration, and determination of Zn(II) at a higher alkaline pH (7, 9.5 ± 0.5, respectively) with poor PF (14 and 26 at retention time 2 and 4 min, respectively) has been reported. , Here, the required pH for extraction was substantial which enhances the possibility of hydrolysis of metal ions. The backwash was made with stringent eluent (1 M HCl solution) for the quantitative recovery of the analyte .…”

Section: Introductionmentioning

confidence: 99%

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Characterization and Density Functional Theory Optimization of a Simultaneous Binder (FSG-XO) of Two Different Species Exploiting HOMO–LUMO Levels: Photoelectronic and Analytical Applications

et al. 2015

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A cost-time effective mesoporous ion-exchange material (FSG-XO) has been synthesized by immobilizing xylenol orange on functionalized silica gel. Its spatially separated highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) have been used for the simultaneous sorption of two different metal centers at their respective high and low oxidation states. The characterization of its corresponding nanomaterial, {Si-has been assessed by a set of sophisticated analysis. FSG-XO possesses high SA BET (346.22 m 2 /g), PV (0.431549 cm 3 /g), uniform pore size (width, 47.1; and diameter, 50.3 nm), high chemical (4 M HNO 3 ) and thermal stability (140°C), high level of reusability (<1000 cycles), high BTC (240 μM g −1 ) and high PF (111). The spatially well separated (931.6 pm) HOMO (−6.1631 eV)−LUMO (4.2795 eV) with a band gap of 10.44 eV denies any sort of charge recombination and proves its utility as a light emitting diode source and it shows its applicability as good donor−acceptor organic electronic device. The extractor exhibits its outstanding performance in binding molecular I 2 at its LUMO and enhances its breakthrough capacity by the same amount as obtained after the full saturation of HOMO by an electrophile (Zn(II)).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization and Density Functional Theory Optimization of a Simultaneous Binder (FSG-XO) of Two Different Species Exploiting HOMO–LUMO Levels: Photoelectronic and Analytical Applications

et al. 2015

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“…Resinas poliméricas vêm sendo extensamente avaliadas como suportes, sobretudo para catalisadores [17][18][19][20][21][22][23] e complexantes de íons metálicos [24][25][26][27][28][29][30][31] . A aplicação desses materiais como suportes para agentes biocidas tem sido relatada em diversas patentes desde a década de 70 [10,[32][33][34][35][36][37][38][39][40][41][42][43][44] .…”

Section: Polímeros Reticulados Com Atividade Biocidaunclassified

Resinas poliméricas reticuladas com ação biocida: atual estado da arte

et al. 2015

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AesumoCopolímeros reticulados à base de divinilbenzeno vêm sendo extensivamente empregados como suportes de catalisadores e complexantes de íons metálicos, adsorventes de compostos orgânicos e fases estacionárias em separações cromatográficas. A introdução de grupos biocidas a estes materiais é relatada em patentes desde a década de 1970, contudo apenas a partir do ano 2000 estes copolímeros passaram a ser aplicados também como suportes para grupos biocidas. A presente revisão apresenta as principais combinações de suportes poliméricos e grupos biocidas estudados com o objetivo de preparar resinas biocidas reticuladas. Procura-se estabelecer relação entre as características dessas resinas e seu mecanismo de ação biocida. Palavras-chave: agentes antimicrobianos imobilizados em polímeros, biocida, copolímeros de estireno-divinilbenzeno, resinas poliméricas. AbstractCrosslinked copolymers of divinylbenzene have been extensively employed as supports for catalysts and chelating groups of metal ions, adsorbents of organic compounds and stationary phases for chromatography separations. The use of these copolymers as support for biocidal groups is reported in patents since the 1970s, but only after 2000 were these copolymers also applied as supports for biocidal groups. This paper describes the main combinations of polymeric supports and biocide groups employed in biocide polymer resins. The relationship between the characteristics of these resins and their mechanism of action is also established in this work.Keywords: antimicrobial agents immobilized on polymers, biocide, styrene-divinylbenzene copolymers, polymeric resins. IntroduçãoA contaminação por micro-organismos pode causar sérias complicações para o homem, particularmente se estiver em equipamentos médicos, cirúrgicos, odontológicos, medicamentos, produtos de higiene e de cuidados com a saúde, sistemas de purificação de água, tecidos, embalagens e estocagem de alimentos [1,2] . Uma maneira de combater as atividades microbianas negativas é através de agentes biocidas. "Biocida" é um termo genérico utilizado para se referir aos compostos dotados da capacidade de inibir o crescimento ou matar determinados micro-organismos. A aplicação desta classe de materiais é muito ampla, podendo ser utilizados nos mais diversos produtos e processos, e por isso outros termos são utilizados para diferenciá-los entre si: antibióticos, antissépticos, desinfetantes e conservantes [3] .Percebe-se que há uma confusão conceitual quanto à atividade do agente antimicrobiano. O termo biocida só deve ser utilizado quando ocorrer a destruição significativa dos micro-organismos e o termo bioestático ou bacteriostático quando ocorrer a inibição do crescimento dos micro-organismos, sem que no entanto estes sejam destruídos [4,5] . Os agentes biocidas podem exercer efeitos tanto bacteriostáticos quanto bactericidas. Os mecanismos de ação responsáveis por esses efeitos podem diferir. Efeitos bacteriostáticos são geralmente considerados quando causam algum dano metabólico que é reversível pela r...

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On-line preconcentration using a resin functionalized with 3,4-dihydroxybenzoic acid for the determination of trace elements in biological samples by thermospray flame furnace atomic absorption spectrometry

Lemos

Bezerra

Amorim

2008

Journal of Hazardous Materials

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On-line Preconcentration and Determination of Zn in Natural Water Samples Employing a Styrene-Divinylbenzene Functionalized Resin and Flame Atomic Absorption Spectrometry

Cited by 12 publications

References 29 publications

Characterization and Density Functional Theory Optimization of a Simultaneous Binder (FSG-XO) of Two Different Species Exploiting HOMO–LUMO Levels: Photoelectronic and Analytical Applications

Characterization and Density Functional Theory Optimization of a Simultaneous Binder (FSG-XO) of Two Different Species Exploiting HOMO–LUMO Levels: Photoelectronic and Analytical Applications

Resinas poliméricas reticuladas com ação biocida: atual estado da arte

On-line preconcentration using a resin functionalized with 3,4-dihydroxybenzoic acid for the determination of trace elements in biological samples by thermospray flame furnace atomic absorption spectrometry

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