Clay behaviour in suspension is related to the ionicity of clay–cation bonds

Marchuk, Alla; Rengasamy, Pichu

doi:10.1016/j.clay.2011.05.019

Cited by 76 publications

(52 citation statements)

References 16 publications

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“…Dispersion is intensified in soils with higher monovalent cation concentration due to thickening of the electric double layer (Mahanta et al 2012), smaller zeta potential neutralization when compared to bivalent cations (Marchuk and Rengasamy 2011), and smaller interaction with soil organic molecules (Setia et al 2013), which reduces the clay-organic matter bonds (Roychand and Marschner 2014 ) and water-dispersible clay, which was in contrast to our expectations (Fig. 3b).…”

Section: Resultscontrasting

confidence: 99%

Physico-chemical attributes of a Cambisol under pasture managed with annual burns after sugarcane vinasse application

Melo

Ferreira

Navroski

et al. 2018

Int J Recycl Org Waste Agricult

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Purpose Sugarcane vinasse is generated in large amounts and can be utilized to improve soil attributes, especially in areas degraded by burns. The aim of the present study was to evaluate the effects of sugarcane vinasse on physico-chemical attributes of a Cambisol managed via annual burns. Methods Soil samples were collected from an annually burned area under pasture and used in an experiment in pots to evaluate the effects of dosages of vinasse (0, 18.8, 37.5, 56.3, 75.0, 112.5, and 150 ). The water-dispersible clay was reduced by the formation of bonds with organic matter, which overlapped the repulsive forces intensified by the increment of K + /(Ca 2+ + Mg 2+ ). The estimated vinasse dosage that provided the minimum water-dispersible clay (69 g kg −1 ) was 110 m 3 ha −1 . Conclusions Vinasse can be applied to improve the physico-chemical attributes of soils degraded by annual burns.

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Section: Resultscontrasting

confidence: 99%

Physico-chemical attributes of a Cambisol under pasture managed with annual burns after sugarcane vinasse application

Melo

Ferreira

Navroski

et al. 2018

Int J Recycl Org Waste Agricult

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“…Although very weak, the net force is still attractive and the particles are held by hydrated cations. If these cations are divalent, further hydration is restricted because of the low ionicity of the clay-cation bonding [25]; the particles are not separated beyond 2-3 nm. Mg-clays swell more than Ca-clays [26,27], presumably because of higher ionicity of Mg bonds than Ca bonds.…”

Section: Processes Leading To Structural Changes On Wetting Of Dry Agmentioning

confidence: 99%

“…Marchuk and Rengasamy [25] hypothesized that, because of both increasing charge and increasing size of a clay particle, the electron cloud in the bond formation will be less influenced by the clay anion, and thus the covalency or ionicity index of a cation alone will indicate the ionic character of a clay-cation bond. These authors derived the covalency index (CI) of a clay-cation bond, which is defined by:…”

Section: Repulsive Forces In Relation To Cations and Anionsmentioning

confidence: 99%

“…The ionicity index of a clay-cation bond indicates the reactivity of water molecules disrupting the bond. Marchuk and Rengasamy [25] reported that the clay behaviour in aqueous suspensions such as turbidity (i.e., clay dispersion), zeta potential, or mean particle size of different homoionic soil clays, e.g., Li + , Na + , K + , Mg 2+ , Ca 2+ , Sr 2+ , or Ba 2+ , was highly correlated to their respective ionicity indices. Ionicity of clay-cation bonds determines the dispersive power of the adsorbed cations.…”

Section: Repulsive Forces In Relation To Cations and Anionsmentioning

confidence: 99%

“…Further, these models do not take into account the roles of K and Mg in influencing clay dispersion. Several researchers have shown the dispersive effects of K and also the less flocculating effect of Mg compared to Ca (e.g., [25,46]). The use of EC (either as electrical conductivity of soil solutions or as total cation concentration) instead of the concentration of individual cations in these models neglects the fact that clay flocculation depends on the individual flocculating power of the cations involved [21,47,48].…”

Section: Deficits In the Models Based On Quirk-schofield Concept On 'mentioning

confidence: 99%

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Irrigation Water Quality and Soil Structural Stability: A Perspective with Some New Insights

Rengasamy

2018

Agronomy

Self Cite

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Abstract:The sustainability of irrigated agriculture depends on the quality of irrigation water used. The electrolyte concentration (EC) of irrigation water may lead to the accumulation of salts in the root zone layers and affect the physiological functions of the crop by osmotic and ion toxicity effects. Further, the cationic and anionic composition of the water may alter the exchangeable cation composition of the soil as well as its pH. Because of the dominance of sodium salts in many sources of irrigation water, parameters related to sodium such as exchangeable sodium percentage (ESP) of soils and sodium adsorption ratio (SAR) of soil solutions have been commonly used to study the effects of sodium in irrigation water on soil structural stability. Quirk and Schofield's concept of 'threshold electrolyte concentration' (TEC) has shown the importance of electrolytes in preventing the effects of sodium on soil structure. Based on this concept, several models have been proposed to relate ESP or SAR with EC to predict the possible impacts of irrigation water on soil structural stability. However, many research reports indicate that this relationship varies with soils, and a given model is not suitable for all types of soils. Further, the effects of potassium and magnesium in the processes leading to clay dispersion are disregarded in these models. This essay analyses all the factors involved in the structural failure of soils with different cationic composition, identifies the defects in these TEC models, and re-defines TEC on the basis of new insights on dispersive and flocculating charges of soils. This review does not deal with EC effects on crops nor the role of contaminant ions not involved with soil structural stability.

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Brine spill remediation utilizing capillary transport and wicking materials in loam and silty clay soils

Green¹,

DeSutter

Meehan

et al. 2022

Agrosystems Geosci & Env

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Oil and gas extraction from the Bakken and Three Forks shale‐oil reserves often produces large volumes of highly saline water, or brine. Brine releases often cause soils to exhibit poor structural and edaphic properties. Because of these negative effects, active remediation is often attempted through the use of in‐situ and ex‐situ techniques. Unfortunately, many conventional methods can be time intensive, costly, and only partially effective. This study sought to determine if salts could be efficiently removed from coarse‐ and fine‐textured soils through the surficial application of a wicking medium consisting of an engineered, paper‐based humidifier wick or ground wheat (Triticum aestivum L.) straw while soils were irrigated from the subsurface with either purified water or a gypsum solution. Over a 56‐d period, the humidifier wick with a gypsum solution reduced extractable Na by 82 and 23% in the loam and silty clay columns, respectively. The humidifier wick with purified water treatments reduced extractable Na by 77 and 8% in the loam and silty clay columns, respectively. Ground straw reduced extractable Na by <12% in all cases. The humidifier wick reduced the mean soil electrical conductivity (EC) by >9 dS m–1 with the largest reductions at deeper depths (i.e., >15 dS m–1 or >90% removal). Results show that evaporative wicks are comparable to other surficial remediation techniques in removing salt mass from soil.

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Clay behaviour in suspension is related to the ionicity of clay–cation bonds

Cited by 76 publications

References 16 publications

Physico-chemical attributes of a Cambisol under pasture managed with annual burns after sugarcane vinasse application

Physico-chemical attributes of a Cambisol under pasture managed with annual burns after sugarcane vinasse application

Irrigation Water Quality and Soil Structural Stability: A Perspective with Some New Insights

Brine spill remediation utilizing capillary transport and wicking materials in loam and silty clay soils

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