Physical, chemical, and mineralogical properties of Mexico City sediments: a geotechnical perspective

1998 ◽  
Vol 35 (4) ◽  
pp. 600-610 ◽  
Author(s):  
JA Díaz-Rodríguez ◽  
R Lozano-Santa Cruz ◽  
VM Dávila-Alcocer ◽  
E Vallejo ◽  
P Girón
Keyword(s):  
Mexico City ◽  
Lacustrine Sediments ◽  
Chemical Properties ◽  
Structural Features ◽  
Exchange Capacity ◽  
In Situ Tests ◽  
Physical Chemical ◽  
Mineralogical Properties ◽  
Ramon Lopez Velarde ◽  
Seismic Tests

Geotechnical, physical, chemical, and mineralogical properties of the sediments of Ramón López Velarde Park were examined. The site is located in the ancient lacustrine zone of Mexico City. In situ tests included a resistivity survey, soundings with an electric cone, and cross-hole seismic tests. In addition, a continuous core was obtained for the upper 40 m. This core was extensively studied in the laboratory to determine the variation of mineralogy, pH, organic matter, cation exchange capacity (CEC), and structural features with depth. The information is unique with respect to previous studies which focused on specimens at a single depth. Results facilitate the interpretation of the deposit evolution, leading to the current properties of this unique lacustrine sequence.Key words: Mexico City, geotechnical properties, lacustrine sediments, physical properties, mineralogy, chemical properties.

scholarly journals COMPOSITION, MICROSTRUCTURE AND PROPERTIES OF QUATERNARY CLAYS OF THE PRIKHANKAYSKAYA DEPRESSION (PRIMORYE)

2019 ◽  
Vol 14 (1) ◽  
pp. 20-34
Author(s):  
T. G. RYASHCHENKO ◽  
N. N. UKHOVA ◽  
S. I. SHTELMAKH ◽  
N. I. BELYANINA ◽  
P. S. BELYANIN
Keyword(s):  
Clay Minerals ◽  
Laboratory Data ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Climatic Conditions ◽  
Water Soluble ◽  
Laboratory Studies ◽  
Microstructural Parameters ◽  
Physical Chemical ◽  
Study Results

The article considers the study results of composition, microstructure and physical-chemical properties of the quaternary clays of the Prikhankayskaya depression in district of the lake Khanka (Primorye) on the example of air-dry samples of geological borehole 45-b in the range of 18–62 m. The objective of research was to obtain new information about the properties of widespread clay sediments in this area using geologic-lithological materials and laboratory data. The schematic geologic-lithological column was composed with the selection of various zones in the quaternary clay sediments section and the border with sediments of the Neogene System. The methodological scheme of laboratory studies of clays was proposed. This scheme includes the determination of chemical and microelement composition, clay minerals, contents of carbonates, water-soluble salts, mobile forms of aluminum oxide, humus, as well as microstructural parameters (method «Microstructure») and some physical-chemical properties. Geochemical coefficients (Kz, CIA, CIW, ICV) determined the degree of chemical maturity of clays and confirmed the results of palynological studies reflecting the fluctuations of the climatic conditions of their formation. For the group of toxic microelements for the first time the special indicator (Zc) was calculated. Which was the criterion for a degree of pollution of the clay sediments section. Clay minerals of the quaternary clays are represented by smectite and hydromica. The clear change in the mineral association was found when passing to the Neogene sediments (kaolinite prevails). The method «Microstructure» revealed the aggregated type of clays microstructure, the domination of the particles of coarse dust fraction among the primary (free) particles and the almost complete absence of the particles of fine-grained sand fraction, the participation of various fractions in the composition of aggregates. The variants of the formation of certain types of aggregates (on sizes) in the fluviolacustrine «khankayskiy» clays are presented. Solid part density, water resistance (soaking time), sedimentation volume, plasticity, relative swelling (samples-pastes) were determined using standard methods for clays. By special methods, the cation exchange capacity was measured and the calculated values of the plasticity index were obtained from forecasting formulas using the yield limit. The proposed methodological scheme of complex laboratory studies of clay sediments can be recommended for problematic geologic-lithological and engineering-geological sections.

Physical, chemical, and mineralogical properties of Mexico City sediments: a geotechnical perspective: Reply

2000 ◽  
Vol 37 (1) ◽  
pp. 276
Author(s):  
JA Díaz-Rodríguez ◽  
R Lozano-Santa Cruz ◽  
VM Dávila-Alcocer ◽  
E Vallejo ◽  
P Girón
Keyword(s):  
Mexico City ◽  
Physical Chemical ◽  
Mineralogical Properties

scholarly journals Infrared spectroscopy as an alternative methodology to evaluate the effect of structural features on the physical-chemical properties of inulins

2018 ◽  
Vol 109 ◽  
pp. 223-231 ◽  
Author(s):  
Nelson Romano ◽  
Cuauhtémoc Araujo-Andrade ◽  
Javier Lecot ◽  
Pablo Mobili ◽  
Andrea Gómez-Zavaglia
Keyword(s):  
Infrared Spectroscopy ◽  
Chemical Properties ◽  
Structural Features ◽  
Physical Chemical ◽  
Alternative Methodology

scholarly journals Relationship between Metabolic Fluxes and Sequence-Derived Properties of Enzymes

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Peteris Zikmanis ◽  
Inara Kampenusa
Keyword(s):  
Metabolic Pathways ◽  
Chemical Properties ◽  
Structural Features ◽  
Kinetic Properties ◽  
Net Charge ◽  
Metabolic Fluxes ◽  
Physical Chemical ◽  
Glycolysis Pathway ◽  
Derived Properties ◽  
Linear Regressions

Metabolic fluxes are key parameters of metabolic pathways being closely related to the kinetic properties of enzymes, thereby could be dependent on. This study examines possible relationships between the metabolic fluxes and the physical-chemical/structural features of enzymes from the yeast Saccharomyces cerevisiae glycolysis pathway. Metabolic fluxes were quantified by the COPASI tool using the kinetic models of Hynne and Teusink at varied concentrations of external glucose. The enzyme sequences were taken from the UniProtKB and the average amino acid (AA) properties were computed using the set of Georgiev’s uncorrelated scales that satisfy the VARIMAX criterion and specific AA indices that show the highest correlations with those. Multiple linear regressions (88.41% < Radjusted2< 93.32%; P<0.00001) were found between the values of metabolic fluxes and the selected sets of the average AA properties. The hydrophobicity, α-helicity, and net charge were pointed out as the most influential characteristics of the sequences. The results provide an evidence that metabolic fluxes of the yeast glycolysis pathway are closely related to certain physical-chemical properties of relevant enzymes and support the view on the interdependence of catalytic, binding, and structural AA residues to ensure the efficiency of biocatalysts and, hence, physiologically adequate metabolic processes.

scholarly journals Synthesis, Characterization, and Metal Adsorption Properties of Formaldehyde-Based Terpolymeric Resins Derived from Anthranilic Acid, Salicylic Acid, and Catechol

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
S. Arasaretnam ◽  
U. P. Dilshani Jayarathna
Keyword(s):  
Salicylic Acid ◽  
Metal Ions ◽  
Anthranilic Acid ◽  
Ph Value ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Time Intervals ◽  
Ion Exchange Capacity ◽  
Ph Variation ◽  
Physical Chemical

Two formaldehyde-based terpolymeric resins (anthranilic acid-catechol-formaldehyde (ACF) and salicylic acid-catechol-formaldehyde (SCF)) have been synthesized by condensing anthranilic acid with catechol and salicylic acid with catechol at 80 ± 5°C using dimethylformamide as a solvent. The resins were characterized by spectral analysis using Fourier-transform infrared (FTIR) spectroscopy. The physical-chemical properties of the resins have been studied. The exchange behavior of various metal ions, namely, Cd2+, Cr3+, Ca2+, and Mg2+, towards the synthesized resins has been studied depending on contact time and pH. Chelating properties of two resins were pH dependent, and with an increase in pH value from 1 to 5, the exchange capacity of metal ions was increased. The increasing rate of ion-exchange capacity was greater in ACF than that in SCF. Cd2+ showed higher rate of exchange at different time intervals in both cases, ACF and SCF. Cr3+ had higher exchange capacity with pH variation in both resins.

scholarly journals PREPARATION SOME ACID-ACTIVATED MONTMORILLONITES FROM CU CHI CLAY AND USING AS CATALYST IN ONE-POT CONVERSION OF BENZALDEHYDE INTO BENZONITRILE

2011 ◽  
Vol 14 (4) ◽  
pp. 43-53
Author(s):  
Dung Duc Pham ◽  
Dat Thanh Vu ◽  
Thach Ngoc Le
Keyword(s):  
Chemical Composition ◽  
Cation Exchange Capacity ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Solid Catalyst ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Physical Chemical ◽  
The One

Montmorillonite is a "green" solid catalyst and support used in many organic reactions. In this paper, we have prepared some acid-activated montmorillonites from Cu Chi clay. Then, we determinated physical-chemical properties such as specific surface area, cation exchange capacity, X-ray diffraction, chemical composition and acidity of these samples. Finally, we chose the best from these montmorillonites and used as catalyst in the one-pot conversion of benzaldehyde into benzonitrile under solvent-free and microwave irradiation.

Chlorinated Organics in Nearshore Waters and Tributaries of the St. Clair River

1986 ◽  
Vol 21 (3) ◽  
pp. 344-350 ◽  
Author(s):  
Barry G. Oliver ◽  
Klaus L.E. Kaiser
Keyword(s):  
United States ◽  
Suspended Sediment ◽  
Waste Disposal ◽  
Large Volume ◽  
Water Samples ◽  
Chemical Properties ◽  
Low Level ◽  
Chemical Company ◽  
Physical Chemical ◽  
The Individual

Abstract The concent rat ions of hexachloroethane (HCE), hexachlorobutadiene (HCBD), pentachlorobenzene (QCB), hexachlorobenzene (HCB) and octachlorostyrene (OCS) in large volume water samples show that the major sources of these chemicals to the St. Clair River are Dow Chemical Company effluents and, to a lesser degree, Sarnia’s Township ditch which drains one of Dow’s waste disposal sites. Tributaries entering the river on both sides of the Canada/United States border contain measurable concentrations of these chemicals indicating low level contamination throughout the area. The degree of water/suspended sediment partitioning of the chemicals (Kp) was studied. Kp values for the individual chemicals changed in a manner consistent with changes in their physical-chemical properties.

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