Preparation and application of water-soluble polymer-metal complexes

Geckeler, K. E.; Lange, Gordon L.; Eberhardt, Hans; Bayer, Ernst

doi:10.1351/pac198052071883

Cited by 242 publications

(144 citation statements)

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“…Such polymeric reagents form soluble polymer complexes which are separated from low-molecular compounds by membrane filtration processes [83]. Thus, uncomplexed inorganic ions can be removed with the filtrate, whereas the water-soluble polymer complexes are retained.…”

Section: Liquid-phase Polymer-based Retentionmentioning

confidence: 99%

“…To separate and preconcentrate metal ions, their solution to which a polymer is added can be passed from a reservoir into the filtration unit. In earlier studies this procedure was designed for the recovery of elements from dilute solutions [83,84]. Later another procedure of absolute preconcentration was recommended in which the polymer reagent was added directly to the cell and then a large volume sample passed through a solution of a relatively high and constant polymer concentration [85] (see Fig.…”

Section: Liquid-phase Polymer-based Retentionmentioning

confidence: 99%

See 1 more Smart Citation

Separation and preconcentration of trace elements and their physico-chemical forms in aqueous media using inert solid membranes (Technical Report)

Spivakov¹,

Shkinev²,

Geckeler³

1994

Pure and Applied Chemistry

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Section: Liquid-phase Polymer-based Retentionmentioning

confidence: 99%

Section: Liquid-phase Polymer-based Retentionmentioning

confidence: 99%

Separation and preconcentration of trace elements and their physico-chemical forms in aqueous media using inert solid membranes (Technical Report)

Spivakov¹,

Shkinev²,

Geckeler³

1994

Pure and Applied Chemistry

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“…The first example of the coordination polymer was reported by Arimato et al (5) . The formation of chelates has been widely used for concentration, separation and extraction of metal ions (7)(8)(9) . The addition of metal ions to the polymers considerably improves the ir mechanical properties and thermostability.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization and Stability of the Polymeric Complexes of Zinc (II), Cadmium (II) and Cerium (III) with 1,4-bis (2`-carboxyphenyla-zomethine) phenylene

2011

Egypt. J. Chem.

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HE FORMATION and stability of binary Zn 2+, Cd 2+ and Ce 3+complexes with 1,4-bis(2`-carboxyphenylazomethine)phenylene (BCPAP) were studied by potentiometric pH-titrations in 50% (v/v) 1,4 dioxane-water medium [I=0.1M KNO 3 ], 25°C. Under uniform conditions the dissociation constants of the ligand BCPAP have also been examined. The potentiometric data showed that the metal contents in all complexes are consistent with 1:1 metal: ligand stoichiometry. From the formation curves the stepwise stability constants of binary chelates were determined and the optimal pH conditions for preparing the solid complexes were specified. The synthesized complexes were characterized using elemental analysis, infrared and electronic spectra. The reaction of the bis-bidentate ligand (1,4-bis (2`-carboxyphenylazomethine)phenylene) BCPAP with each of Zn 2+ , Cd 2+ and Ce 3+ gives coordination polymers. Thermal stabilities of the various coordination polymers were studied. The isolated coordination polymers were investigated by differential scanning calorimetry (DSC) to determine the glass transition temperature (Tg). The obtained Tg and DSC data, showed the formation of one kind of coordination polymers (homo-coordination polymers). The conductivity of the polychelates were measured both from the solution and electrode side. The surfaces of the samples were examined by scanning electron microscopy (SEM).

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“…The preconcentration of heavy metals in natural water has been performed by means of evaporation, solvent extraction 2,3 , ion-exchange and chelating resins 4-7 as well as coprecipitation. 8 When automating these procedures in continuous-flow units, faster determinations and a better quality of results are attained.Automatization by preconcentration in a homogeneous medium, called liquid-phase polymer-based retention (LPR) [9][10][11][12] , is also proposed. It consists of using soluble polymers, such as poly (vinylpyrrolidone), that perform selective complexation of the ion that is being concentrated according to the solution pH.…”

mentioning

confidence: 99%

“…Automatization by preconcentration in a homogeneous medium, called liquid-phase polymer-based retention (LPR) [9][10][11][12] , is also proposed. It consists of using soluble polymers, such as poly (vinylpyrrolidone), that perform selective complexation of the ion that is being concentrated according to the solution pH.…”

mentioning

confidence: 99%

Application of Sequential Injection Analysis to the Assay of Lead Retention Characteristics by Poly(vinylpyrrolidone): Trace Analysis of Lead in Waters

1999

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Because heavy metals are usually present in water at trace levels, their determination can only be performed by highly sensitive analytical methodologies, namely electrothermal atomic absorption spectrophotometry (ETAAS) 1 , which is the most widely used. This technique is very expensive, though, as far as its purchase and daily use are concerned. Flame atomic absorption spectrophotometry (FAAS) is much cheaper and less complex in terms of handling, but its sensitivity is too low for this type of determination. Therefore, a preconcentration procedure is required both for minimizing the matrix interferences and improving the detection limit. The preconcentration of heavy metals in natural water has been performed by means of evaporation, solvent extraction 2,3 , ion-exchange and chelating resins 4-7 as well as coprecipitation. 8 When automating these procedures in continuous-flow units, faster determinations and a better quality of results are attained.Automatization by preconcentration in a homogeneous medium, called liquid-phase polymer-based retention (LPR) [9][10][11][12] , is also proposed. It consists of using soluble polymers, such as poly (vinylpyrrolidone), that perform selective complexation of the ion that is being concentrated according to the solution pH. The addition of a soluble polymer to the sample enables a more effective retention of the species intended by means of sample ultrafiltration. Although this automatization procedure is much more expensive than continuous-flow techniques, the polymers used are rather cheap when compared to the resins similarly employed in continuous flows.The present work reports on the behavior of poly-(vinylpyrrolidone) when used for the preconcentration of lead in the heterogeneous stage and continuous-flow conditions. Hence, the coupling of an analytical unit to a simple sequential injection analysis system has been studied and is being proposed. It is common knowledge that sequential injection analysis is a third-generation flow technique 13 characterized by being more robust and versatile regarding the variation of the analytical conditions. Therefore, a preconcentration procedure based on easily implemented analytical columns may be very advantageous, because the feeble optimization of the columns can be overcome by the hydrodynamic conditions featured by the SIA systems. Experimental Reagents and solutionsAll solutions were prepared with bideionized water (conductivity <0.1 µS/cm) and analytical-grade reagents without any further treatments.Lead calibrating solutions were prepared by dilution with water from a stock solution of 1 g/l lead previously prepared with Pb(NO 3 ) 2 . The pH of the calibrating solutions was set to the average level attained from the samples (pH=3) by adding 2 mol/l HNO 3 .For the interference assays, lead calibrating solutions with different concentrations of the interferent were prepared from stock solutions of 1 g/l previously attained by weighing and diluting the following substances: Faculdade de Farmácia (U.P.), Rua Anibal ...

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Preparation and application of water-soluble polymer-metal complexes

Cited by 242 publications

References 1 publication

Separation and preconcentration of trace elements and their physico-chemical forms in aqueous media using inert solid membranes (Technical Report)

Separation and preconcentration of trace elements and their physico-chemical forms in aqueous media using inert solid membranes (Technical Report)

Synthesis, Characterization and Stability of the Polymeric Complexes of Zinc (II), Cadmium (II) and Cerium (III) with 1,4-bis (2`-carboxyphenyla-zomethine) phenylene

Application of Sequential Injection Analysis to the Assay of Lead Retention Characteristics by Poly(vinylpyrrolidone): Trace Analysis of Lead in Waters

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