The Correlation of Surface Area With Other Properties of Nineteen British Clay Soils

Farrar, D M; Coleman, J. D.

doi:10.1111/j.1365-2389.1967.tb01493.x

Cited by 146 publications

(66 citation statements)

References 10 publications

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“…This is understandable as 75-95% of the surface area of the sample is due to the fine fraction of till (Nieminen 1985). There is also a clear positive correlation between the clay content of soils and porosity (Farrar & Coleman 1967). In the non-anomalous zone, the median value of the specific surface area is 1.58 and in the anomalous zone 14.5 (Table 2).…”

Section: Grain Size Distribution Of Tillmentioning

confidence: 75%

Relationship between mineralogy and the physico-chemical properties of till in central Finland

Räisänen¹,

Tenhola²,

Mäkinen³

1992

Bull Geol Soc Finland

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: Relationship between mineralogy and the physico-chemical properties of till in central Finland. Bull. Geo!. Soc. Finland 64, Part 1,.The chemical and physical characteristics of the fine fraction of till were examined in the area of the Raahe-Ladoga metallogenic belt in central Finland. Till, weathered bedrock and rock samples were collected from the area, where element concentrations of till abruptly ranged from high in an anomalous zone (NE) to low in a non-anomalous zone (SW). The grain size distribution, specific surface area and unit weight, and the leachability of elements measured with several chemical methods were determined from the fine fraction (<0.06 mm) of till. The mineralogical composition of the fine fraction of till and weathered bedrock was established with the X-ray diffraction method (XRD), and the chemical composition of rock samples with the X-ray fluorescence method (XRF).The main factor affecting the increased element concentrations in the anomalous zone is the variation in mica and clay mineral types. The abundance of trioctahedral micas (biotite) and vermiculitic clays carrying most of the trace metals dissolved in aqua regia, has affected to the geochemical pattern of till in the study area. The concentrations of trace metals in the iron precipitates extracted with acid oxalate were too low to be used as evidence of the hydromorphic origin of the anomalous zone. The abundance of main silicates (quartz, feldspars) does not vary much in the fine fraction of till throughout the study area.The absence of the swelling smectite component from the surface layers of till indicates that the source was not the underlying weathered bedrock. The till with a vermiculitic mixed-layer mineral in the anomalous zone contains more material from old sediments weathered during interstadial or interglacial time than does the till with a low clay content in the non-anomalous zone. The abrupt change in the mineralogical and physical properties of till in the study area is suggested to be attributed to the difference in the transport and accumulation dynamics of overburden during deglaciation.

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Section: Grain Size Distribution Of Tillmentioning

confidence: 75%

Relationship between mineralogy and the physico-chemical properties of till in central Finland

Räisänen¹,

Tenhola²,

Mäkinen³

1992

Bull Geol Soc Finland

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“…The surface density of charge of most common clay minerals of soil origin does not vary greatly from an average value of between 0.23 and 0.28 m-equiv, per 100 m 2 (Fripiat, 1964;Farrar and Coleman, 1967) and therefore further work should be based on a standard or range of standards having charge densities close to these values.…”

Section: C(~)mentioning

confidence: 99%

The Ordering of Cetylpyridinium Bromide on Vermiculite

Slade¹

1978

Clays and clay miner.

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X-ray superlattice reflections, infrared spectroscopy, and chemical analyses have established that cetylpyridinium bromide (CPB) is highly ordered when adsorbed on vermiculite. The molecules, which stand at about 57 ~ to the silicate surface, form close-packed arrays. Full surface coverage is achieved only for the most highly charged vermiculites. The packing within the arrays accounted for the superlattice observed and each adsorbed molecule had an area of 18.4 /~2 at the surface. The implications of these findings for the CPB method used in soil surface area studies are discussed.

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“…4) show significant differences in the hydrosorption capacity of WDC and AC, both at a low relative pressure of water vapor (p/p 0 ) and at an ultimate uptake (p/p s ). Important factors able to affect the value of the specific surface of the clay fractions are their clay mineral, HS and free iron contents [32][33][34]. /g, respectively, because of the predominance of minerals with rigid structures in its composition.…”

Section: Adsorption Characteristics and Specific Surface Of Wdc And Acmentioning

confidence: 99%

Effect of humic substances and clay minerals on the hydrosorption capacity of clay particles in meadow soils (Middle Priamurje, Far East of Russia)

Матюшкина

Kharitonova

2015

Chem. Biol. Technol. Agric.

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Background:The study of clay fractions is usually focused on water-dispersible clay (WDC), which is a good indicator of many soil processes involving water (water erosion, transfer and removal of nutrients and contaminants). Aggregated clay (AC) that remains after WDC extraction is also important, as it controls the formation of aggregates and their mechanical and water resistance. The aim of this study was a gradual extraction of WDC and AC fractions from periodically overmoistening meadow podbel (mollic planosol) and the study of the content and composition of humic substances and clay minerals in these fractions as well as their effect on the hydrosorption capacity. Results:The complete extraction of clay fractions showed that AC prevails over WDC along the entire profile and most evidently in the Ag horizon. Most of the organic matter is concentrated in AC. X-ray diffractometry and SEM analysis revealed a similar set of minerals in both fractions, but in different proportions. In the Ag and Elcg horizons, WDC is enriched with clastic components (fine-dispersed quartz, feldspars, amphiboles) and clay minerals with rigid structures (illite, kaolinite, chlorite), compared to AC. In the Btg1 horizon smectite prevails in both fractions. The specific surface, which characterizes the hydrosorption capacity of clays, of WDC is 28-95 m 2 /g less than that of AC. Maximal difference in specific surface of clays is found in the horizon Elcg, where AC has the highest content of free iron. Conclusions:The present study allowed defining the heterogeneity of the total clay in the periodically overmoistened meadow soil, which is manifested in differences in composition and properties of WDC and AC fractions. AC largely determines hydrosorption properties of soil due to a high content of organic matter and the predominance of swelling minerals in its composition, compared with WDC. The obtained data highlight the importance of studying clay fractions WDC and AC for the characteristics of differentiation and aggregation of the clay in soils.

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The Correlation of Surface Area With Other Properties of Nineteen British Clay Soils

Cited by 146 publications

References 10 publications

Relationship between mineralogy and the physico-chemical properties of till in central Finland

Relationship between mineralogy and the physico-chemical properties of till in central Finland

The Ordering of Cetylpyridinium Bromide on Vermiculite

Effect of humic substances and clay minerals on the hydrosorption capacity of clay particles in meadow soils (Middle Priamurje, Far East of Russia)

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