Quantitative Mineralogical Analysis of Soil Clays Containing Amorphous Materials: A Modification of the Alexiades and Jackson Procedure

Rengasamy, Pichu; Sarma, V.A.K.; Murti, G. S. R.

doi:10.1346/ccmn.1975.0230112

Cited by 13 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The clay and silt fractions were dominantly kaolinitic with appreciable quantities of amorphous material (Rengasamy et al, 1975). !…”

Section: Resultsmentioning

confidence: 99%

Isomorphous Substitution of Iron for Aluminium in Some Soil Kaolinites

Rengasamy

1975

Clays and clay miner.

Self Cite

View full text Add to dashboard Cite

Abstract--Clay ( < 2 ttm) and fine silt (~20/~m) fractions of twenty seven soil samples from eight tropical ferruginous profiles of the Mysore Plateau (India) were analysed for kaolinite by dehydroxylation and selective dissolution. The considerable amounts of iron extracted by the procedure and the closeness of the SiO2/R203 molar ratios (2.00-2.18) to the ideal value of 2.00 indicated that iron was a structural constituent of the kaolinites, The calculated unit cell cation composition of the kaolinites showed a substitution of 0.114).82 atoms of Fe(III) for A1 in every four octahedral sites. The kaolinites in these soils appear to be products of crystallization from weathering solutions.

show abstract

“…The clay and silt fractions were dominantly kaolinitic with appreciable quantities of amorphous material (Rengasamy et al, 1975). !…”

Section: Resultsmentioning

confidence: 99%

Isomorphous Substitution of Iron for Aluminium in Some Soil Kaolinites

Rengasamy

1975

Clays and clay miner.

Self Cite

View full text Add to dashboard Cite

show abstract

“…This behavior is different from that of the soil and standard clay in which CEC Ca/Mg should be greater or equal to CEC K//NH4. According to van Reeuwijk and de Villiers (1968), the replacing power of the cations against K adsorbed on their gels, which are similar compositionally to those of Table 4, is NH4 > Na > Ca > Mg. This sequence follows the lyotropic series, and fixation of the cation is not restricted to K. In other words, any cation could be fixed against the exchange of a weaker replacer.…”

Section: Resultsmentioning

confidence: 57%

“…It should be emphasized, however, that for samples with a high content of amorphous material, caution should be exercised in the determination of vermiculite and montmorillonite using the method of Alexiades and Jackson (1965). A modified method has been proposed by Rengasamy et al (1975), in which amorphous material is removed prior to the determination of cation-exchange capacities. For some soil clays, a treatment with 0.5 N NaOH could alter the nature of exchange sites.…”

Section: Resultsmentioning

confidence: 99%

Cation-Exchange Behavior of Clays and Synthetic Aluminosilica Gels

Chu

1979

Clays and clay miner.

View full text Add to dashboard Cite

Abstract--Cation-exchange capacities determined by methylene blue adsorption (CEC MB) and by the amount of K displaced from a K-saturated clay by NH4 (CEC K//NH4) correlate closely in five soil clays from Pennsylvania, but differ greatly in two soil clays with a large content of amorphous material. CEC MB was found to provide a more precise distinction between montmorillonite and vermiculite than CEC K//NH~. Synthetic aluminosilicate gels showed CEC K//NH4 > CEC Ca/Mg > CEC MB, but no relation to the behavior of the two soil clays with a large content of amorphous material was found.

show abstract

“…The mineralogy of the amorphous-free clay fractions was determined by the methods outlined by Rengasamy et al (1975). The soil clays had fair amounts of smectite (30-45 %) and mica (15-30 %) with smaller amounts (15-20 %) of kaolinite and quartz.…”

Section: Mineralogy Of Amorphous-free Claysmentioning

confidence: 99%

“…The soil clays of the ferruginous soils of Mysore are dominant in kaolinite (50-80 %) with small amounts of mica and quartz (Rengasamy et al 1975). The model of Krishna Murti et al (1976) was tested for its applicability for the amorphous materials in the alluvial soils of Delhi which contain considerable amounts of clay minerals (30-45 % smectite) of high cation exchange and other surface properties.…”

Section: Mineralogy Of Amorphous-free Claysmentioning

confidence: 99%

The nature of amorphous materials in alluvial soils

Rão

Singh

Murti

1977

J Plant Nutrition & Soil

View full text Add to dashboard Cite

Die Natur des amorphen Materials in alluvialen Böden Die Natur von amorphem Material in der Tonfraktion (≤2μ) einiger alluvialer Böden Indiens wurde untersucht. Die Bodentone hatten beträchtliche Anteile an Smectit (22–40 %), Illit (10–28 %), Kaolinit (13–18 %) und Quarz (22–40 %). Das amorphe Material wurde auf der Basis des von Krishna Murti et al. (1976) vorgeschlagenen Modells charakterisiert. Der berechnete OH‐Wasser‐Gehalt betrug durchschnittlich 15,7 %, die Kationen‐Austauschkapazität (gemessen bei pH 7,0) variierte von 65,2 bis 255,3 mval/100g und zeigte eine hohe negative Korrelation zu der äußeren Hydroxyaluminiumpolymer‐Komponente, die die Brauchbarkeit des Modells für das amorphe Material in diesen Böden bestätigt.

show abstract

Quantitative Mineralogical Analysis of Soil Clays Containing Amorphous Materials: A Modification of the Alexiades and Jackson Procedure

Cited by 13 publications

References 7 publications

Isomorphous Substitution of Iron for Aluminium in Some Soil Kaolinites

Isomorphous Substitution of Iron for Aluminium in Some Soil Kaolinites

Cation-Exchange Behavior of Clays and Synthetic Aluminosilica Gels

The nature of amorphous materials in alluvial soils

Contact Info

Product

Resources

About