نتایج جستجو برای: smectite

تعداد نتایج: 982  

Journal: :Journal of the Mineralogical Society of Japan 1990

Journal: :Environmental pollution 2012
Liwen Zhang Elijah J Petersen Wen Zhang Yongsheng Chen Miguel Cabrera Qingguo Huang

Carbon nanotubes are often modified to be stable in the aqueous phase by adding extensive hydrophilic surface functional groups. The stability of such CNTs in water with soil or sediment is one critical factor controlling their environmental fate. We conducted a series of experiments to quantitatively assess the association between water dispersed multi-walled carbon nanotubes (MWCNTs) and thre...

Journal: :Bulletin of The Chemical Society of Ethiopia 2021

Solid-state intercalation was applied to prepare organo-smectites using cationic surfactants and natural clays containing smectite at various surfactant/smectite ratios. The enter the interlayers of smectites causing a swelling clays. used were collected in Siétougou Diabari villages located eastern part Burkina Faso. solid-state successful for all four applied, n-dodecyltrimethylammonium bromi...

Journal: :Emergency Medicine Journal 2006

Journal: :iran agricultural research 2008
h. abbaslou a. abtahi

pedogenesis and clay mineralogy of soils and rock samples were studied in a transect of calcareous, gypsiferous, saline soils and sediments of bakhtegan lake bank in southern iran. the main objectives of study were to determine the occurrence of clay minerals and factors controlling their distribution pattern and relative abundance in soils and parent materials. the soil parent material is high...

رفیعی, بهروز ,

Identification of randomly interstratified illite – smectite, the most abundant of the mixed-layer clay minerals, is occasionally difficult. The so-called magnesium chloride and ethylene glycol treatment does not always reveal all the peaks necessary for identification of these clay minerals. Therefore a new modality, lithium chloride treatment, is suggested. With the application of this treatm...

1996
SE Spain

AB STRACT: Glauconite and Ca phosphate peloids occur in Jurassic and Cretaceous bioclastic carbonate rocks from pelagic swell sequences of the Algayat-Crevillente Unit (Subbetic Zone). The size and morphology of the peloids are controlled by the bioclasts. The glauconite in both stratigraphic positions is K rich (>0.69 atoms p.f.u.) and shows well-defined 10 AÊ lattice fringes. Poorly crystalli...

Journal: :Environmental science & technology 2007
Michael G Roberts Clayton L Rugh Hui Li Brian J Teppen Stephen A Boyd

Nitroaromatic compounds (NACs) are prominent soil and sediment contaminants that are strongly adsorbed by smectites at extents that depend on hydration properties of the exchangeable cation. Potassium smectites adsorb nitroaromatics much more strongly than calcium smectites, so that adjustment of K+ versus Ca2+ occupation on cation exchange sites in smectites can be used to modulate the retenti...

ژورنال: علوم آب و خاک 2018
جعفری, سیروس, عبدلی, یونس,

This study was done to evaluate the effect of topography, water table, and irrigation on gypsc soil development and clay mineral diversity in Ram-Hormuz Plain, Khuzestan Province. To localize, 10 profiles in this region that covered all purpose irrigation and topography situation were described. The results showed that the soils could be classified in Entisols, Inceptisols and Aridisols orders....

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