Calculation of distribution coefficients in inorganic gel chromatography

Saunders, Dennis; Pecsok, Robert L.

doi:10.1021/ac60257a029

Cited by 71 publications

(17 citation statements)

References 11 publications

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“…The required tenfold difference between the diffision coefficients of I-and C10,-is easily achieved by this mechanism. In fact, polyacrylamide gels have been used for the analytical separation of halogen-containing species (20). For reaching a qualitative picture (21), we estimated D, /D, = 15.…”

Section: Aily Experience Suggests Thatmentioning

confidence: 99%

Modeling of Turing Structures in the Chlorite—Iodide—Malonic Acid—Starch Reaction System

Lengyel

Epstein

1991

Science

478

292

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Recent experiments on the chlorite-iodide-malonic acid-starch reaction in a gel reactor give the first evidence of the existence of the symmetry breaking, reaction-diffusion structures predicted by Turing in 1952. A five-variable model that describes the temporal behavior of the system is reduced to a two-variable model, and its spatial behavior is analyzed. Structures have been found with wavelengths that are in good agreement with those observed experimentally. The gel plays a key role by binding key iodine species, thereby creating the necessary difference in the effective diffusion coefficients of the activator and inhibitor species, iodide and chlorite ions, respectively.

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Section: Aily Experience Suggests Thatmentioning

confidence: 99%

Modeling of Turing Structures in the Chlorite—Iodide—Malonic Acid—Starch Reaction System

Lengyel

Epstein

1991

Science

478

292

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“…Separation of metal ions and simple anions by various types of hydrophilic polymer gels, that is, cross‐linked dextran, polyacrylamide gels, etc. has been studied since the 1960s . It has also been shown in recent years that even hydrophobic materials such as polystyrene resin and octadecyl bonded silica exhibit selective ion separation.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of ion stacking in aqueous partition chromatographic processes

Akter

Ogiyama

Saito

et al. 2017

J of Separation Science

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It has been reported that ion enrichment phenomena are observed in liquid chromatographic processes with an aqueous mobile phase on the columns packed with nonionic materials. However, the mechanism of the ion enrichment is not at all well understood. In this study, we investigated the retention and enrichment behaviors of simple inorganic anions on a C18-bonded silica column and a cross-linked hydroxylated methacrylic polymer gel column with pure aqueous mobile phases containing various electrolytes. We show that the stacking of ionic solutes can successfully be accounted for by the ion partition model, and it takes place due to the effect of the background coion in the eluent and/or sample solution on the distribution of the ions between the bulk water and the water incorporated in the packing material, which acts as the stationary phase. Using the ion exclusion effect of fixed anionic charges on a packing material as well as the ion stacking by partition, we developed a simple and versatile method for effective enrichment of anionic solutes in aqueous solutions. The enrichment factor and the elution time of the stacked ion zone can be predicted by the ion partition model.

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“…Polymers with amide groups are known to be strong absorbers of metal ions, evidenced by color of polymer when colored metal ions were used. The metal ions are probably coordinated with the amide groups 12, 13. The thermogravimetry study of PAM with adsorbed metal ions (from metal nitrates) showed that the ions exert a stabilizing effect on the polymer.…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation of water soluble polymers and their binary blends

Vijayalakshmi¹,

Madras²

2006

J of Applied Polymer Sci

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ABSTRACT:The effect of five different metal oxides on the pyrolysis of poly(ethylene oxide) (PEO), polyacrylamide (PAM), and poly(vinyl alcohol) (PVA) was investigated using thermogravimetry. The presence of metal oxide did not influence the degradation of PEO while the order of metal oxide on the degradation rate of PAM and PVA was PbO Ͼ Co 3 O 4 Ͼ CuO Ͼ ZnO Ͼ Al 2 O 3 . The miscibility and the decomposition of PEO-PAM and PVA-PAM blends were also investigated. The blends were found to be immiscible and the presence of one polymer did not influence the degradation of the other polymer in the polymer blend.

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Calculation of distribution coefficients in inorganic gel chromatography

Cited by 71 publications

References 11 publications

Modeling of Turing Structures in the Chlorite—Iodide—Malonic Acid—Starch Reaction System

Modeling of Turing Structures in the Chlorite—Iodide—Malonic Acid—Starch Reaction System

Mechanism of ion stacking in aqueous partition chromatographic processes

Thermal degradation of water soluble polymers and their binary blends

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