scholarly journals Physical-chemical characterization of uranium containing sediments

2021 ◽  
Vol 9 (3) ◽  
Author(s):  
Lucia Závodská ◽  
Eva Kosorínová ◽  
Juraj Lesný ◽  
Dušan Bodiš
Keyword(s):  
Chemical Characterization ◽  
Uranium Content ◽  
Stream Sediments ◽  
Uranium Mine ◽  
Mountain Range ◽  
Sequential Fractionation ◽  
Sediment Samples ◽  
Physical Chemical ◽  
Groundwater Outflow

The presented paper is intended to study the chemical behaviour of combined geogenicanthropogenic uranium content in specific stream sediments. The sampling points have been chosen with respect to the natural conditions in the locality of groundwater outflow from a former uranium mine adit in Považský Inovec mountain range, near Kálnica village. Besides the total uranium determination and physical-chemical characterization of the relevant water- and sediment samples we carried out modified Tessier type sequential fractionation extractions of natural- and artificially contaminated sediment samples after time dependent agitation in air and in the atmosphere of argon. The obtained results have been compared with those fulfilled with montmorillonite K-10. The total uranium concentrations of the relevant groundwater samples as well as of stream sediments have been determined by ICP-MS using HP 4500. The determinations of uranium in extracts have been accomplished according STN757614, utilizing arsenazo III as a selective complex forming reagent for spectrophotometric determination of uranyl-ions at 650 nm. The total uranium concentration of the groundwater outflow and in the sediment taken in its immediate vicinity has been 31.75±0.35 μg dm-3 and 38.0±2.7 μg g-1 respectively. Unlike montmorillonit K-10, in which the carbonate-bound fraction of uranium after 1 week aeration and agitation in argon atmosphere represents 22.8% and 18.6% respectively, uranium in investigated sediments has been present predominantly in carbonate-bound fraction-reaching under similar conditions 38.6% and 26.6%, respectively.

scholarly journals Editorial for Special Issue “Historical Mineral Pigments”

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 237
Author(s):  
Carolina Cardell ◽  
Jose Santiago Pozo-Antonio
Keyword(s):  
Chemical Characterization ◽  
Glass Enamel ◽  
Special Issue ◽  
High Quality ◽  
Physical Chemical ◽  
Scientific Disciplines ◽  
Natural And Synthetic

The physical–chemical characterization of natural and synthetic historical inorganic and mineral pigments, which may be found embedded in paintings (real or mock-ups), glass, enamel, ceramics, beads, tesserae, etc., as well as their alteration under different decay scenarios, is a demanding line of investigation. This field of research is now both well established and dynamic, as revealed by the numerous publications in high-quality journals of varied scientific disciplines. [...]

Physical-Chemical Characterization of Fruit Purees and Relationship with Sensory Analysis Carried out by Infants (12 to 24 mo)

2015 ◽  
Vol 80 (5) ◽  
pp. E1005-E1011 ◽  
Author(s):  
A.M. Inarejos-García ◽  
V. Mancebo-Campos ◽  
P. Cañizares ◽  
J. Llanos
Keyword(s):  
Sensory Analysis ◽  
Chemical Characterization ◽  
Physical Chemical

Physical–chemical characterization of binary systems of metformin hydrochloride with triacetyl-β-cyclodextrin

2007 ◽  
Vol 45 (3) ◽  
pp. 480-486 ◽  
Author(s):  
Giovanna Corti ◽  
Gaetano Capasso ◽  
Francesca Maestrelli ◽  
Marzia Cirri ◽  
Paola Mura
Keyword(s):  
Binary Systems ◽  
Chemical Characterization ◽  
Metformin Hydrochloride ◽  
Physical Chemical

Two- and Three-Dimensional Physical–Chemical Characterization of CER[AP]: A Study of Stereochemistry and Chain Symmetry

2021 ◽  
Vol 125 (35) ◽  
pp. 9960-9969
Author(s):  
Fabio Strati ◽  
Joana S. L. Oliveira ◽  
Lukas Opalka ◽  
Tetiana Mukhina ◽  
Bodo Dobner ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Chemical Characterization ◽  
Physical Chemical

Electron microscope and physical chemical characterization of C-phycocyanin from fresh extracts of two blue-green algae

1973 ◽  
Vol 19 (7) ◽  
pp. 831-836 ◽  
Author(s):  
Martin Kessel ◽  
Robert MacColl ◽  
Donald S. Berns ◽  
Mercedes R. Edwards
Keyword(s):  
Red Light ◽  
Chemical Characterization ◽  
Thylakoid Membranes ◽  
Sedimentation Velocity ◽  
Particulate Material ◽  
Thin Sections ◽  
Blue Green Algae ◽  
Physical Chemical ◽  
Sedimentation Velocity Centrifugation

The particulate material (intact and dissociated phycobilisomes), adjacent to the thylakoids of Plectonema boryanum and Calothrix parietina, was examined in thin sections and in freshly prepared C-phycocyanin extracts. For the latter a method was developed using spheroplasts of log-phase cells. When examined by sedimentation velocity centrifugation, the sedimentation coefficients of the rapidly extracted C-phycocyanin were found to be 18 S and 5 S. Also, a 10-S boundary was observed with P. boryanum. When C. parietina was grown under red light the 18-S aggregates increased to 20 S. The 18 S particles, in electron micrographs of negatively stained preparations, displayed eight subunits surrounding a central one. The possibility that some subunits fall out of the plane of view is contemplated in proposing a dodecamer arrangement for such particles. The 20-S particles were also examined by electron microscopy. However, the precise number of monomer units associated with either the 18-S or 20-S particles has not yet been ascertained. Thin sections of intact algal cells are presented to demonstrate the presence of phycobilisomes along the outer faces of the thylakoid membranes.

Characterization and destabilization of spent filter backwash water particles

2002 ◽  
Vol 2 (2) ◽  
pp. 115-122 ◽  
Author(s):  
A. Adin ◽  
L. Dean ◽  
F. Bonner ◽  
A. Nasser ◽  
Z. Huberman
Keyword(s):  
Water Treatment ◽  
Chemical Characterization ◽  
Physical Parameters ◽  
Ph Measurements ◽  
Particle Count ◽  
Water Treatment Plants ◽  
Physical Chemical ◽  
Organic Particles ◽  
The Impact

Inorganic and organic particles, including bacteria, viruses and parasites, which are retained within a granular filter during surface water filtration, are removed by backwashing the filter with clean water or water and air. The objective of the study was to characterize SFBW and determine its treatability by coagulation. Microbial and physical-chemical characterization of SFBW collected from a number of different water treatment plants was performed. Experiments to determine the impact of coagulation/flocculation on the SFBW samples were also conducted. SFBW was collected from six different water treatment plants and analyzed for microbial and physical parameters. Physical characterization was done on SFBW collected from all of the treatment plants. Turbidity and pH measurements were taken over the course of the backwash run, and the backwash samples were collected in two to four 20 L containers. A number of parameters were measured for the samples in each container, as well as for SFBW composites made by mixing equal portions of the container contents. The measured parameters included: turbidity, pH, TSS, DOC, UV-254 and alkalinity. Jar tests were carried out on individual containers, on SFBW composite and on SFBW composite that was allowed to settle for one hour. Turbidity and particle count data was collected for both settled and filtered samples.

Physical-chemical characterization of microplastics present in some exfoliating products from Spain

2019 ◽  
Vol 139 ◽  
pp. 91-99 ◽  
Author(s):  
V. Godoy ◽  
M.A. Martín-Lara ◽  
M. Calero ◽  
G. Blázquez
Keyword(s):  
Chemical Characterization ◽  
Physical Chemical
Sign in / Sign up

Export Citation Format

Share Document