Results 131 to 140 of about 3,944 (185)

Adsorption of Atrazine on Smectites

Soil Science Society of America Journal, 1992
Abstract Smectites may strongly influence the fate of pesticides in soils due to their large surface area and abundance in agricultural soils. This research was undertaken to determine the effects of smectite properties on the affinity of smectitic clays for atrazine (2‐chloro‐4‐ethylamino‐6‐isopropylamino‐1, 3, 5
Laird, D.A., Barriuso, E., Dowdy, R.H., Koskinen, W.C.   +3 more
openaire   +2 more sources

Interaction of Rimsulfuron with Smectites

Clays and Clay Minerals, 1997
AbstractThe adsorption of the sulfonylurea herbicide rimsulfuron, [N-((4,6-dimethoxypyrimidin-2-yl)aminocarbonyl)-3-(ethylsulfonyl)-2-pyridinesulfonamide], on clay minerals with different saturating cations was studied. Three smectites with different lattice charge distribution (hectorite, montmorillonite and nontronite) were selected and made ...
CALAMAI, LUCA, PANTANI, OTTORINO-LUCA, A. Pusino, C. Gessa, P. Fusi   +4 more
openaire   +1 more source

Smectite Interactions with Flavomononucleotide

Clays and Clay Minerals, 1984
AbstractAdsorption isotherms and UV-visible and Mössbauer spectroscopic data point to specific interactions between flavomononucleotide (FMN) and Fe3+-smectite. The maximum amount of FMN adsorption was 0.3 mmole/g of Fe3+-smectite giving a 1:1 molar proportion of Fe3+ and FMN.
M M, Mortland, J G, Lawless, H, Hartman, R, Frankel   +3 more
openaire   +2 more sources

Change in Layer Charge of Smectites and Smectite Layers in Illite/Smectite During Diagenetic Alteration

Clays and Clay Minerals, 1996
AbstractThe changes in amount and location of layer charge during diagenetic alteration have been investigated for smectites and smectite layers of illite/smectite interstratified minerals (I/S) by X-ray powder diffraction analysis with various expansion behavior tests: 1) ethylene glycol (EG) solvation (XRD); 2) K-saturation and EG solvation; 3) Li ...
Tsutomu Sato, Takashi Murakami, Takashi Watanabe   +2 more
openaire   +1 more source

Adsorption of Imidazolinone Herbicides on Smectite−Humic Acid and Smectite−Ferrihydrite Associations

Journal of Agricultural and Food Chemistry, 2001
Adsorption of imazapyr (IMZ), imazethapyr (IMZT), and imazaquin (IMZQ) was studied on two smectite-humic acid and two smectite-ferrihydrite binary systems prepared by treating a Wyoming smectite with a humic acid extracted from soil (4 and 8% w/w of the smectite) and with just-precipitated synthetic ferrihydrite (8 and 16% w/w of the smectite ...
LEONE P, NEGRE M, GENNARI, Mara Maddalena, BOERO V, CELIS R, CORNEJO J.   +5 more
openaire   +4 more sources

Chemistry of Smectitic and Illitic Phases in Interstratified Soil Smectite

Soil Science Society of America Journal, 1991
Abstract The objective of this investigation was to determine the elemental composition and mineralogy of the smectitic and illitic phases in interstratified smectite‐illite from a typical upper Midwestern agricultural soil.
D. A. Laird, P. Barak, E. A. Nater, R. H. Dowdy   +3 more
openaire   +1 more source

Weathering of smectite and illite- smectite under temperate climatic conditions

Clay Minerals, 2001
AbstractWeathering profiles developed on the top surface of a bentonite (containing Al-Mg montmorillonite) and a K-bentonite (containing mixed-layer illite-smectite (I-S)) under Central European temperate conditions were studied by XRD, HRTEM, FTIR, K-Ar and chemical analyses.
V. Šucha, J. Środoń, N. Clauer, F. Elsass, D. D. Eberl, I. Kraus, J. Madejová   +6 more
openaire   +3 more sources

The variable charge of dioctahedral smectites

Journal of Colloid and Interface Science, 2013
One of the most important properties of smectites is the cation exchange capacity resulting both from the structural permanent charge and the pH depending variable charge. The variable charge, in turn, mainly results from the edge aluminol groups (in the case of dioctahedral smectites).
S, Kaufhold, R, Dohrmann
openaire   +2 more sources

Characterization of smectites synthesised from zeolites and mechanism of smectite synthesis

Clay Minerals, 1985
AbstractSmectites were synthesised hydrothermally from zeolites in an Mg-rich brine at 300°C under a confining pressure of 30 MPa and characterized by XRD using the Greene-Kelley Li-saturation test and the K+-saturation/glycolation test. The synthetic smectites were found to be dioctahedral with only tetrahedral negative layer charge; the layer charge ...
S. Komarneni, E. Breval
openaire   +1 more source

Phase relations among smectite, R1 illite-smectite, and illite

American Mineralogist, 1997
A variety of smectitic and illitic clays were studied by TEM and AEM, following ex- pansion by L.R. White resin, to define phase relations for clay minerals undergoing di- genesis and low-grade metamorphism. Samples included a prograde shale sequence from the Gulf Coast, a hydrothermal bentonite from Zempleni, Hungary, and shales from the Nankai Trough,
Hailiang Dong, Donald R. Peacor, Robert L. Freed   +2 more
openaire   +1 more source