Studies in Surface Area Measurements of Soils

Puri, Balwant Rai; Murari, Krishna

doi:10.1097/00010694-196405000-00008

Cited by 26 publications

(5 citation statements)

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“…The reduction in SA measured with H 2 O vs. EGME in the smectite-dominated Saskatchewan soils and Ca-montmorillonite is believed to be due to limited water uptake in the interlayer spaces of smectites. Karathanasis and Hajek (1982) and Puri and Murari (1963) multiplied the water-sorption BET estimate of the surface area by a factor of 2 to correct for the observation (Mooney et al 1952) that only a single layer of water is present in the interlayer spaces of montmorillonite when the external surfaces are covered by a monolayer. If interlayer water uptake is limited, Eq.…”

Section: Discussionmentioning

confidence: 99%

Comparison of three methods of measuring surface area of soils

Jong

1999

Can. J. Soil. Sci.

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Surface area (SA) is an important property of soils, but different methods can give widely different estimates of SA, and of the contribution of organic matter to SA. This study was undertaken to compare two common methods of measuring SA (EGME [ethylene glycol monoethyl ether] and N2 sorption) with SA estimates using H2O sorption on selected Saskatchewan soils; some soils from Kenya were included to show the impact of clay mineralogy. For the Saskatchewan soils, the three estimates of SA were highly correlated to each other and to clay content, but SA EGME was 2 to 3 times SA H2O and 7 to 52 times SA N2. Organic matter did not appear to contribute to SA EGME, increased SA H2O and decreased SA N2. Clearly the three methods differ in their access to internal and external surface area and this should affect their utility as indices of the sorptive capacity of field soils. Key words: Surface area, EGME, N2 sorption, water sorption

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Section: Discussionmentioning

confidence: 99%

Comparison of three methods of measuring surface area of soils

Jong

1999

Can. J. Soil. Sci.

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“…Odler and his coworkers (1972) claimed that nitrogen at low temperatures is unable to penetrate into small pores of hydrated Portland cement pastes: they recommended the use of water in such cases. Puri and Murari (1963) reported on reasonable specific areas of soils obtained by water adsorption. In contrast, Quirk (1955) remarked on the uncertainties associated with the areas of soils determined by water as adsorbate.…”

Section: The Nature Of the Water Monolayermentioning

confidence: 94%

Adsorption of water on the fine fractions of Finnish tills

Kellomäki¹,

Nieminen²

1986

Bull Geol Soc Finland

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This study deals with adsorption of water from the vapour phase on till samples at 25°C. The dry weights were determined after drying the samples in an oven at 105°C. Complete adsorption isotherms were measured for 41 tills with a "desiccator method" using saturated salt solutions as humidity standards. In addition, partial isotherms were determined for about 40 other samples. The isotherms were BET types I and II. The surface areas computed with the BET equation from water adsorption are considerably larger than the nitrogen adsorption areas of the same samples. In order to compare the isotherms with each other they have been presented as film thicknesses against relative humidity. All curves can then be satisfactorily represented by four model isotherms, which reflect the interactions of water molecules and the adsorbent surfaces. To a certain extent the model isotherms correlate with the mineral composition of the samples. Free energies of adsorption were calculated. Their negative values indicate that adsorption is highly exothermic at low humidities, or the samples are hygroscopic.

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“…Water vapor sorption on mineral surfaces generally occurs in three stages: (1) water vapor monolayer adsorption/desorption on external surfaces; (2) water vapor interlayer and multiple layer adsorption/desorption; and (3) capillary condensation, which refers to the growth and coalescence of water into liquid-like overlayers (Yeşilbaş & Boily, 2016). The monolayer regime occurs when water activity (a w ) ranges from near 0 to between 0.19 and 0.53, depending on clay mineral type and properties (Newman, 1983;Puri & Murari, 1964;Quirk & Murray, 1999). In both kaolinite and montmorillonite, a monolayer forms on external surfaces until a w reaches~0.2 (Hatch et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Water Repellency Decreases Vapor Sorption of Clay Minerals

Chen

Shang

Eick

et al. 2018

Water Resources Research

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As soils become dry, water primarily exists as vapor that adsorbs to and desorbs from particle surfaces. The drying process also often enhances soil water repellency, yet the effects of repellency on soil water vapor sorption and exchange are not well understood. The objective of this study was to quantify the water vapor sorption dynamics of two minerals (Ca2+ saturated kaolinite and montmorillonite), in which water repellency was induced using two organic agents: cetyl trimethylammonium bromide (~4% by mass) and stearic acid (0.5%, 5%, 10%, 20%, and 35% by mass). Samples were then analyzed for water vapor sorption isotherms, solid‐water contact angles, organic carbon content, mineral surface morphology, hydrophobic functional groups (using Fourier transform infrared spectroscopy), zeta potential, and particle size distributions. The results showed that the water repellent treatments altered particle surface potentials and decreased surface areas relative to the controls. As a result, those samples adsorbed significantly less water and had less hysteresis between adsorption and desorption isotherms than the nontreated controls (p < 0.05). Differences in water adsorption were most pronounced for water activities >0.6, where hydrophobic compounds may have inhibited water vapor condensation, even at low concentrations. In contrast, solid‐water contact angles were small in montmorillonite treatments with <10% stearic acid, suggesting that low levels of hydrophobic compounds may have greater effect on vapor sorption compared to liquid water imbibition. Altogether, these results imply that repellency may reduce water retention in dry soils and enhance water vapor losses.

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Studies in Surface Area Measurements of Soils

Cited by 26 publications

References 0 publications

Comparison of three methods of measuring surface area of soils

Comparison of three methods of measuring surface area of soils

Adsorption of water on the fine fractions of Finnish tills

Water Repellency Decreases Vapor Sorption of Clay Minerals

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