Physical Properties of Allophane Soils

Maeda, Takashi; Takenaka, H.; Warkentin, B. P.

doi:10.1016/s0065-2113(08)60220-5

Cited by 114 publications

(65 citation statements)

References 26 publications

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“…Each disturbed soil sample was approximately 0.5 kg of soil in a plastic bag, while undisturbed soil samples were taken by using a soil ring cylinder with the inner diameter of 7.6 cm and height of 4 cm. Disturbed soil samples were used to determine: (1) particle size distribution using the sieve-hydrometer method (Gee and Bauder, 1986) after the soil samples were airdried, organic matter was eliminated using H 2 O 2 and was dispersed using HCl (0.002 N) to anticipate any existence of allophane mineral (Maeda et al, 1977) due to the existence of the active volcanoes; (2) organic carbon content using the wet oxidation method (Nelson and Sommers, 1996); (3) soil pH (H 2 O) using the 1:5 soil-water suspension method (Rayment and Higginson, 1992). From the undisturbed soil samples, information about the soil bulk density was obtained using the core method (Grossman and Reinsch, 2002), while volumetric SWR at matric potentials of 0 kPa, -1 kPa, -10 kPa, -33 kPa was measured using the pressure-plate apparatus method (Richards and Fireman, 1943), and volumetric SWR at a matric potential of -1500 kPa was measured using the pressuremembrane apparatus method (Richards, 1947).…”

Section: Soil Datasetmentioning

confidence: 99%

Application and recalibration of soil water retention pedotransfer functions in a tropical upstream catchment: case study in Bengawan Solo, Indonesia

Rustanto

Booij

Wösten

2017

Journal of Hydrology and Hydromechanics

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Hydrological models often require input data on soil-water retention (SWR), but obtaining such data is laborious and costly so that SWR in many places remains unknown. To fill the gap, a prediction of SWR using a pedotransfer function (PTF) is one of the alternatives. This study aims to select the most suitable existing PTFs in order to predict SWR for the case of the upper Bengawan Solo (UBS) catchment on Java, Indonesia. Ten point PTFs and two continuous PTFs, which were developed from tropical soils elsewhere, have been applied directly and recalibrated based on a small soil sample set in UBS. Scatter plots and statistical indices of mean error (ME), root mean square error (RMSE), model efficiency (EF) and Pearson's correlation (r) showed that recalibration using the Shuffled Complex Evolution-University of Arizona (SCE-UA) algorithm can help to improve the prediction of PTFs significantly compared to direct application of PTFs. This study is the first showing that improving SWR-PTFs by recalibration for a new catchment based on around 50 soil samples provides an effective parsimonious alternative to developing a SWR-PTF from specifically collected soil datasets, which typically needs around 100 soil samples or more.

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Section: Soil Datasetmentioning

confidence: 99%

Application and recalibration of soil water retention pedotransfer functions in a tropical upstream catchment: case study in Bengawan Solo, Indonesia

Rustanto

Booij

Wösten

2017

Journal of Hydrology and Hydromechanics

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“…Volcanic ash soils, especially those widely distributed throughout Japan, characteristically have porous and relatively stable natural structures, but once disturbed or dried out, their physical properties change markedly (Maeda et al 1977;Wada 1989), These properties are mainly due to the key clay mineral of the soils, allophane. Since allophane consists of unit spherical particles 3.5-5.5 nm diameter (Kitagawa 1971;Wada and Wada 1977), we investigated how the unit particles of allophane assemble to form the macro structure of the soils.…”

Section: Introductionmentioning

confidence: 99%

Size and Shape of Allophane Particles in Dispersed Aqueous Systems

Karube

1996

Clays and clay miner.

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Abstract--Aqueous suspensions of allophane show relatively high viscosity, presumably because of strong particle interaction between the unit particles. To test this hypothesis, we measured the particle weight and particle size of allophane during a dispersion using the light scattering method. The particle weight was more than several hundred times larger than that of the unit particle, and the size was 100-400 nm, whereas the Stokes' diameter of the particles in the sample was less than 50 nm. Particle weight and size varied with the pH of the sample. Particle sizes were cross-checked by ultrafiltration through membrane filters. The experimental findings show that the unit particles of allophane within dilute dispersions appear to be associated like strings of beads, forming domains (primary floccules) about 100 nm in diameter. When these domains coagulate under certain conditions, they do not grow analogously but form clusters, such as secondary floccules, then precipitate. Formation of secondary flocculation of loose structure accounts for the maximum relative viscosity at the transition pH between dispersion and coagulation.

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“…Therefore, the irreversible changes in the water retention curves of allophane due to air-drying must have been caused by the irreversible aggregation of allophane, as has been reported by Kubota (1972). It is reasonable that in nature an allo- phanic soil, once air-dried, would show a marked irreversible decrease in water retention because larger aggregates would have been formed irreversibly by air-drying (Kubota 1976;Maeda et al 1977).…”

Section: Resultsmentioning

confidence: 86%

“…The water retention of allophanic soils decreases markedly on air-drying (Maeda et al 1977), the cause of which is regarded to be the irreversible aggregation of allophane (Kubota 1972). One of our purposes was to examine whether the colloidal particles of allophane separated from air-dried soil retain the effects of airdrying.…”

Section: Introductionmentioning

confidence: 99%

Water Retention by Colloidal Allophane and Imogolite with Different Charges

Karube

Abe

1998

Clays and clay miner.

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Abstract--Water retention curves of colloidal allophane and imogolite with different charges and different pretreatments were measured using a tension plate and a pressure plate apparatus. An irreversible effect of air-drying was found for the water retention of colloidal allophane even for particles of less than 50 nm in Stokes" diameter collected from air-dried soil. This was attributed to the irreversible submicroscopic aggregation of allophane. Fresh allophane colloids with a low absolute net charge retained more water above -100 J Kg -t than did highly charged ones due to the formation of a microporous structure. Allophane did not swell under ordinary conditions, but the relatively highly charged allophane recovered water retention above -100 J kg t during the wetting process. Imogolite retained 1.5 times more water than Na-montmorillonite at about -650 J kg t due to micropores formed by intertwining fibrous particles.

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Physical Properties of Allophane Soils

Cited by 114 publications

References 26 publications

Application and recalibration of soil water retention pedotransfer functions in a tropical upstream catchment: case study in Bengawan Solo, Indonesia

Application and recalibration of soil water retention pedotransfer functions in a tropical upstream catchment: case study in Bengawan Solo, Indonesia

Size and Shape of Allophane Particles in Dispersed Aqueous Systems

Water Retention by Colloidal Allophane and Imogolite with Different Charges

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