The application of a thermal detector to the gel chromatography of inorganic compounds

Yoza, Norimasa; Ogata, Takayuki; Ueno, Y.; Ohashi, Shigeru

doi:10.1016/s0021-9673(00)92422-1

Cited by 26 publications

(7 citation statements)

References 11 publications

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“…If the size-exclusion mechanism governs the distribution of ionic solutes into the pores, on the contrary, the effects of the counter-ion and co-ion on the distribution coefficient of the analyte ion depend on their relative size to that of the analyte ion. [24][25][26][27] When the hydration radius of the analyte ion is larger than those of the counter-ions and the co-ions, the distribution coefficient of the analyte ion should be determined by the size of the analyte ion itself and is expected to be independent of the type of the counter-ion or co-ion. On the other hand, when the size of the counter-ion, X nÀ , is larger than that of the analyte ion, A p+ , the distribution coefficient of the analyte ion, D YX A is determined by the size of the counter-ion because of the requirement of the electrical neutrality.…”

Section: Anion Exchange Capacitymentioning

confidence: 99%

“…Although hydrophilic polymer gels are entirely different materials from crosslinked polystyrene and alkyl-bonded silica, it has been reported that they can also separate inorganic ions in a manner which appears to be similar to that observed in the hydrophobic materials. For example, Ogata et al 25,26 showed that the chromatographic retention volume of magnesium ions in a Sephadex G-15 column (a crosslinked dextran) depends on the type of counter-anion in the aqueous eluent, the retention volume increasing in the order SO 4 2À o Cl À o NO 3…”

Section: Introductionmentioning

confidence: 99%

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Interfacial water on hydrophobic surfaces recognized by ions and molecules

Shibukawa

Kondo

Ogiyama

et al. 2011

Phys. Chem. Chem. Phys.

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Recent spectrophotometric and molecular dynamics simulation studies have shown that the physicochemical properties and structures of water in the vicinity of hydrophobic surfaces differ from those of the bulk water. However, the interfacial water acting as a separation medium on hydrophobic surfaces has never been detected and quantified experimentally. In this study, we show that small inorganic ions and organic molecules differentiate the interfacial water formed on the surfaces of octadecyl-bonded (C(18)) silica particles from the bulk water and the chemical separation of these solutes in aqueous media with hydrophobic materials can be interpreted with a consistent mechanism, partition between the bulk water phase and the interfacial water formed on the hydrophobic surface. Thermal transition behaviour of the interfacial water incorporated in the nanopores of the C(18) silica materials and the solubility parameter of the water calculated from the distribution coefficients of organic compounds have indicated that the interfacial water may have a structure of disrupted hydrogen bonding. The thickness of the interfacial water or the limit of distance from the hydrophobic surface at which molecules and ions can sense the surface was estimated to be 1.25 ± 0.13 nm from the volume of the interfacial water obtained by a liquid chromatographic method and the surface area, suggesting that the hydrophobic effect may extend beyond the first solvation shell of water molecules directly surrounding the surfaces.

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Section: Anion Exchange Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interfacial water on hydrophobic surfaces recognized by ions and molecules

Shibukawa

Kondo

Ogiyama

et al. 2011

Phys. Chem. Chem. Phys.

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“…The ionization of a weak monoprotic base, B, in the external liquid phase takes place according to the equilibrium BH+ ^B + H+ (14) where BH+ is the conjugate acid. The equilibrium is characterized by the acid dissociation constant of the protonated base, Kv which is given by [H+][B]…”

Section: Methodsmentioning

confidence: 99%

Effect of eluant electrolyte on chromatographic retention of organic acids, bases, and ampholytes on polyacrylamide gel

Shibukawa¹,

Ohta²

1985

Anal. Chem.

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“…Ogata et al (5) have shown that the elution volume of magnesium ion on Sephadex G-15 column depends strongly on the type of counteranion in the eluant, the elution volume increasing in the order sulfate < chloride < nitrate < per-chlorate. They also reported (5,6) that this order corresponds to the order of the elution volumes of these counteranions when eluted with 0.1 M sodium chloride solution. Tarutani et al (7) have observed a similar anion effect on the chromatographic behavior of some divalent metal ions.…”

mentioning

confidence: 85%