Clay mineralogy as affecting disaggregation in some palygorskite containing soils of the Jordan and Bet-She'an Valleys

Soil Research ◽  
1999 ◽  
Vol 37 (5) ◽  
pp. 913 ◽  
Author(s):  
Alexander Neaman ◽  
Arieh Singer ◽  
Karl Stahr
Keyword(s):  
Calcium Ions ◽  
Clay Fraction ◽  
Clay Mineralogy ◽  
Sodium Adsorption Ratio ◽  
Exchangeable Sodium ◽  
High Quality ◽  
Low Sodium ◽  
Quality Water ◽  
Soil Clay ◽  
Intermediate Value

The influence of clay mineralogy on disaggregation in some palygorskite-containing soils of the Jordan and Bet-She'an Valleys was examined. The disaggregation potential of different minerals in the soil clay fraction was investigated by establishing differences in the mineral suite between the original and disaggregated clay fractions. By shaking the soil with distilled water, calcite, dolomite, feldspar, and palygorskite were disaggregated preferentially. The pattern for quartz was inconsistent. Among phyllosilicates, palygorskite was the most strongly, disaggregated, while smectite was the least disaggregated mineral. The disaggregation potential of kaolinite was of intermediate value. By shaking the soil with 0 ⋅ 01 N NaCl, calcite and dolomite were released preferentially, and were the dominant minerals in the disaggregated clay fraction. Scanning electron microscopy observations indicate that palygorskite fibres do not associate into aggregates in soils and suspensions, even when saturated with calcium ions. The present findings are relevant for soils with low exchangeable sodium percentage. These soils can be expected under rain-fed agriculture or irrigation with high quality water which has a low sodium adsorption ratio.

Exchangeable sodium, subplasticity and hydraulic conductivity of some Australian soils

Soil Research ◽  
1979 ◽  
Vol 17 (1) ◽  
pp. 115 ◽  
Author(s):  
DS McIntyre
Keyword(s):  
Hydraulic Conductivity ◽  
Clay Content ◽  
Packed Bed ◽  
Clay Soils ◽  
Exchangeable Sodium Percentage ◽  
Exchangeable Sodium ◽  
High Quality ◽  
A Value ◽  
Degree Of Swelling ◽  
Quality Water

The hydraulic conductivities of beds of packed fragmented material from a variety of clay soils (mostly normal plastic but including some subplastics) and some non-clay soils, have been measured using high quality water. The degree of swelling of each packed bed (originally air-dry) was also determined. The data have been examined in relation to the exchangeable sodium percentage (ESP), clay content and type, and the degree of subplasticity. For the normal plastic soils, ESP influenced the hydraulic conductivity more than any other property. Its influence was independent of clay content and type. The results support the premise that an ESP much less than 15 should be accepted as the value above which soils can be adversely affected physically; a value of 5 would be more relevant. For the subplastic soils, the hydraulic conductivity was independent of ESP, and swelling was small considering their clay contents.

scholarly journals Provenance and Sedimentary Context of Clay Mineralogy in an Evolving Forearc Basin, Upper Cretaceous-Paleogene and Eocene Mudstones, San Joaquin Valley, California

Minerals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 71
Author(s):  
Andrew Hurst ◽  
Michael Wilson ◽  
Antonio Grippa ◽  
Lyudmyla Wilson ◽  
Giuseppe Palladino ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Upper Cretaceous ◽  
Clay Fraction ◽  
Clay Mineralogy ◽  
Bulk Rock ◽  
X Ray Diffraction ◽  
Arc Volcanism ◽  
X Ray ◽  
Magmatic Arc ◽  
Tropical Weathering

Mudstone samples from the Moreno (Upper Cretaceous-Paleocene) and Kreyenhagen (Eocene) formations are analysed using X-ray diffraction (XRD) and X-ray fluorescence (XRF) to determine their mineralogy. Smectite (Reichweite R0) is the predominant phyllosilicate present, 48% to 71.7% bulk rock mineralogy (excluding carbonate cemented and highly bio siliceous samples) and 70% to 98% of the <2 μm clay fraction. Opal CT and less so cristobalite concentrations cause the main deviations from smectite dominance. Opal A is common only in the Upper Kreyenhagen. In the <2 μm fraction, the Moreno Fm is significantly more smectite-rich than the Kreyenhagen Fm. Smectite in the Moreno Fm was derived from the alteration of volcaniclastic debris from contemporaneous rhyolitic-dacitic magmatic arc volcanism. No tuff is preserved. Smectite in the Kreyenhagen Fm was derived from intense sub-tropical weathering of granitoid-dioritic terrane during the hypothermal period in the early to mid-Eocene; the derivation from local volcanism is unlikely. All samples had chemical indices of alteration (CIA) indicative of intense weathering of source terrane. Ferriferous enrichment and the occurrence of locally common kaolinite are contributory evidence for the intensity of weathering. Low concentration (max. 7.5%) of clinoptilolite in the Lower Kreyenhagen is possibly indicative of more open marine conditions than in the Upper Kreyenhagen. There is no evidence of volumetrically significant silicate diagenesis. The main diagenetic mineralisation is restricted to low-temperature silica phase transitions.

scholarly journals Remaining phosphorus and sodium fluoride pH in soils with different clay contents and clay mineralogies

2004 ◽  
Vol 39 (3) ◽  
pp. 241-246 ◽  
Author(s):  
Marcelo Eduardo Alves ◽  
Arquimedes Lavorenti
Keyword(s):  
Buffer Capacity ◽  
Ammonium Oxalate ◽  
Clay Mineralogy ◽  
Clay Content ◽  
Response Curves ◽  
Solution Ph ◽  
Ph Values ◽  
Soil Clay ◽  
Soil Clay Content ◽  
Discriminatory Capacity

The remaining phosphorus (Prem) has been used for estimating the phosphorus buffer capacity (PBC) of soils of some Brazilian regions. Furthermore, the remaining phosphorus can also be used for estimating P, S and Zn soil critical levels determined with PBC-sensible extractants and for defining P and S levels to be used not only in P and S adsorption studies but also for the establishment of P and S response curves. The objective of this work was to evaluate the effects of soil clay content and clay mineralogy on Prem and its relationship with pH values measured in saturated NaF solution (pH NaF). Ammonium-oxalate-extractable aluminum exerts the major impacts on both Prem and pH NaF, which, in turn, are less dependent on soil clay content. Although Prem and pH NaF have consistent correlation, the former has a soil-PBC discriminatory capacity much greater than pH NaF.

scholarly journals Wien effect of Cd/Zn on soil clay fraction and their interaction

2018 ◽  
Vol 19 (1) ◽  
Author(s):  
Tingting Fan ◽  
Chengbao Li ◽  
Juan Gao ◽  
Dongmei Zhou ◽  
Marcelo Eduardo Alves ◽  
...  
Keyword(s):  
Clay Fraction ◽  
Soil Clay ◽  
Wien Effect

Green and facile synthesis of high-quality water-soluble Ag-In-S/ZnS core/shell quantum dots with obvious bandgap and sub-bandgap excitations

2018 ◽  
Vol 753 ◽  
pp. 364-370 ◽  
Author(s):  
Yanyan Chen ◽  
Qiang Wang ◽  
Tianyong Zha ◽  
Jigang Min ◽  
Jingying Gao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Soluble ◽  
Core Shell ◽  
Facile Synthesis ◽  
High Quality ◽  
Quality Water
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