Adsorption as a function of molecular parameters in gas solid chromatography

Okamura, Judy P.; Sawyer, Donald T.

doi:10.1021/ac60307a009

Cited by 35 publications

(17 citation statements)

References 4 publications

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“…The most convincing evidence that partitioning to airwater interfaces is real is the careful studies of Karger et al (18,19) and Hartkopf and Karger (20), who have measured partitioning to the air-water interface by a gas chromatographic retention time method in which interfacial concentrations are measured using a solid support such as Chromosorb coated with water. Similar studies have been undertaken by Okamura and Sawyer (21) with moistened soil and siliceous materials and by Dorris and Gray (22) for normal alkane sorption on macroporous silica.…”

Section: Introductionsupporting

confidence: 65%

Partitioning of organic chemicals at the air-water interface in environmental systems

Hoff¹,

Mackay²,

Gillham³

et al. 1993

Environ. Sci. Technol.

147

116

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It is suggested that partitioning of organic chemicals to the air-water interface can be significant and must be quantified in several situations of environmental interest including partitioning of chemicals into small air bubbles in water into small water drops in air (for example, fogs), and between the phases present in relatively dry soils. Experimental data are reported for interface-air partitioning of a variety of chemicals and are consolidated with previous data to show that interfacial partitioning is primarily controlled by the chemical's hydrophobicity. Correlations are derived for interface-air and interfacewater coefficients from data for 44 polar and nonpolar chemicals. The environmental implications of interfacial partitioning are discussed, and methods are suggested for including the interface as a compartment in mass balance calculations involving air bubbles, water drops, and soils.

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Section: Introductionsupporting

confidence: 65%

Partitioning of organic chemicals at the air-water interface in environmental systems

Hoff¹,

Mackay²,

Gillham³

et al. 1993

Environ. Sci. Technol.

147

116

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“…According to the classical view on adsorption and zeolite catalysis, mainly energetic interactions govern the adsorption selectivity. For example, it is well accepted that in gas phase conditions at low degree of pore occupancy, longer hydrocarbon chains are adsorbed more selectively than their shorter homologues on most zeolites because of the larger interaction energy [3][4][5][6]. This results in the selective catalytic conversion of the longer chains from mixtures of short and long chains, which already demonstrates the link between adsorption and catalysis on microporous solids [7].…”

Section: Introductionmentioning

confidence: 94%

Adsorption and Reaction in Confined Spaces

Denayer¹,

Daems²,

Baron³

2006

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Adsorption et réaction dans des espaces confinés -L'adsorption de molécules dans des matériaux microporeux cristallins implique des interactions énergétiques et entropiques spécifiques. L'assemblage moléculaire dans ces espaces confinés résulte dans des effets de sélectivité complètement différents des ceux qu'on observe traditionnellement avec des solides amorphes ou mésoporeux. Quelques exemples d'effets entropiques ou d'assemblage moléculaire dans l'adsorption d'hydrocarbures dans des zéolites sont présentés. Abstract -Adsorption and Reaction in Confined Spaces

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“…Confirmation of the nonspecific nature of the interaction mechanisms responsible for the retardation of halocarbon tracers is seen in Figure 5. The In (tn --t•) values (and thus the net interaction energies) of the tracers are well correlated with molar refractions, a property closely related to electronic polarizability [Okamura and Sawyer, 1971 ].…”

Section: The Variation Of the Retention Times Of These Compounds On Tmentioning

confidence: 99%

Organic solute‐mineral surface interactions: A new method for the determination of groundwater velocities

Ciccioli¹,

Cooper²,

Hammer³

et al. 1980

Water Resources Research

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When the adsorption processes affecting the migration rates of organic solutes in groundwater systems are considered in detail, it can be shown that the use of multiple tracers should allow accurate calculation of the groundwater velocity even when all the tracers are retarded to some extent by interactions with mineral surfaces in the aquifer and even when the extent of that retardation is not known beforehand. It should be required only that the tracers be members of a series of compounds whose surface interaction energies vary regularly, this condition being met, for example, by compounds in the series C2ClnF6−n Experimental studies aimed at testing this concept show that two series of tracers behave as expected on laboratory columns (limestone and sand), thus indicating the fundamental validity of the approach. Further, the nature of the interactions between the mineral surfaces and the tracer molecules can be shown in these cases, at least, to be nonspecific, the strength of the interaction depending only on the polarizability of the tracer molecule. It seems likely that other satisfactory tracers can be selected using this criterion and that the approach should be applicable even to systems involving many different mineral surface types.

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Adsorption as a function of molecular parameters in gas solid chromatography

Cited by 35 publications

References 4 publications

Partitioning of organic chemicals at the air-water interface in environmental systems

Partitioning of organic chemicals at the air-water interface in environmental systems

Adsorption and Reaction in Confined Spaces

Organic solute‐mineral surface interactions: A new method for the determination of groundwater velocities

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