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Showing 1 to 20 of 108 for “"Trace amounts"”.
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Removal of trace amounts of dieldrin from aqueous solution using electrochemically treated carbon
It had been shown that electrochemical activation of carbons increases the surface area. This investigation was conducted to find out whether or not electrochemical activation will improve the adsorptive capacity of carbon. Two types of carbons were used: Graphitar type grades 25 and 39. Aqueous …
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UV Laser and LED Induced Fluorescence Spectroscopy for Detection of Trace Amounts of Organics in Drinking Water and Water Sources
… of UV LIF spectroscopic measurements of trace contaminants in drinking water and other water sources. Fluorescence spectra of a number of water samples were studied, including those related to the reverse osmosis water treatment and membrane fouling, domestic and international drinking …
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Part I. Determination of Trace Amounts of Anionic Synthetic Detergents Inwater. Part Ii. Determination of Organic Nitro, Nitroso and Azo Compoundswith Copper
Made available in DSpace on 2014-12-05T19:38:07Z (GMT). No. of bitstreams: 1 6303243.pdf: 3501990 bytes, checksum: b8ef411b9ae6b6987c8d7ebfc5c60d06 (MD5) Previous issue date: 1962
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Flame spectroscopic studies of bismuth, lanthanum, lead and silver with particular reference to their determination in steels.
… and silver and describes the determination of trace amounts of the four metals in steel after the preliminary solvent extraction of the metals. A study of the interference effects of the matrix elements upon both the extraction and determination of each metal is included. The thesis also …
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ΜΕΛΕΤΗ ΚΑΤΑΛΥΤΙΚΟΥ ΠΡΟΣΔΙΟΡΙΣΜΟΥ ΙΧΝΟΣΥΓΚΕΝΤΡΩΣΕΩΝ ΙΟΝΤΩΝ ΣΙΔΗΡΟΥ (ΙΙΙ) ΚΑΙ ΒΑΝΑΔΙΟΥ (V)
… METHOD IS DESCRIBED FOR THE DETERMINATION OF TRACE AMOUNTS OF IRON (III) AND VANADIUM (V). THE METHOD IS BASED ON THE CATALYTIC EFFECT OF IRON (III) AND VANADIUM (V) ON THE OXIDATION OF 3,5-DIAMINOBENZOIC ACID DIHYDROCHLORIDE BY HYDROGEN PEROXIDE AND POTASSIUM BROMATE, RESPECTIVELY. THE …
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Hydrogen terminated silicon surfaces: Development of sensors to detect metallic contaminants and stability studies under different environments
… utilizes a silicon-based sensor to detect trace levels of metallic contaminants in hydrofluoric acid. The sensor performance with respect to two non-contaminating reference electrode systems was evaluated. In the first case, conductive diamond was used as a reference electrode. In the …
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Deposition of Metal Oxides and Metal Carbonyls on Silicon Surfaces Using Solution Chemistry
… detected the presence of the desired product and trace amounts of byproducts on the surface. Finally, numerical simulations of irreversible adsorption were used to calculate theoretical yields for comparisons to the experimental coverage values.
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Availability of Organochlorides and Accumulation in Populations of Tadarida brasiliensis (Free-Tailed Bat) and Eptesicus fuscus (Big Brown Bat)
… still present in the environment, although in trace amounts. A wide range of organochlorides was found in the livers. When T. brasiliensis and E. fuscus were compared using a Wilcoxon signed- rank test, no significant difference in the types of organochlorides was found between the species. …
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Total synthesis of a virotoxin and analogs for conformational studies
… the first total synthesis of alloviroidin in trace amounts, along with that of three analogs containing L-proline (Pro), trans-3-hydroxyproline (3-Hyp) or cis-4-hydroxyproline (4-hyp) residue substituting for 2,3-trans-3,4-trans-dihydroxyproline in the natural product. We report herein an …
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Investigation and Characterization of Composite Silica Aerogel Nanostructures Obtained Via Magnetron Sputtering
… a non-homogeneous nanocomposite material. Trace amounts of Cu penetrate up to 10 µm into the SA structure, as revealed by SEM-EDS analysis. The resulting nanocomposite, characterized by spectrophotometric examination, exhibited UV scattering, high transmittance, and absorption in the …
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Polarographic trace analysis of copper, lead and cadmium
… an accurate, reliable, and inexpensive method of trace analysis for copper, cadmium, and lead in foods. AT this time, the Association of Official Analytical Chemists Manual, eleventh edition, (4) has only official and recognized methods of analysis for copper (25.023), cadmium (25.018), and lead …
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Distribution of trace elements in olivines and proxenes - an experimental study
… system anorthite-forsterite-silica to which trace amounts of the transition metal ions Cr³⁺, Fe²⁺, Mn²⁺, Co²⁺, Ni²⁺, and Cu²⁺ had been added. The resulting concentrations of the transition metal ions in the liquid and crystalline phases were determined using the electron microprobe. The …
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Nuclear magnetic resonance studies of boron trihalide complexes of 1,1-BIS (dimethylamino) ethylene and related bases
… reaction in the DME-BF, system gives rise to trace amounts of a complex aSSigned as (DME)2BF2+. (DME)2BF2+ is produced in much larger quantities in t he DME-BF3-BC13 and DME-BF,-BBr, systems by reaction of free DME with DME:BF2X (X = Cl, Br). Restricted r otation about the C-N bonds of …
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Porous Gallium Nitride Generated by Electroless Etching: Morphology, Optical Properties, and Sensing Applications
… GaN, allowing the spectroscopic detection of trace amounts of analytes. The advantages of using porous GaN as a SERS substrate are the simplicity of substrate preparation and the consistency of the SERS response across the substrate. Ongoing studies are focused on using the innate properties …
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The crystal and molecular structures of some transition metal-barbiturate complexes
… metals, even though some are present in only trace amounts, generally appear in the active centres of enzymes that catalyze substrates to form aggregate molecules. The barbiturates on the other hand are members of a group of widely used drugs known as hypnotics, many of which are medicinally …
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Toxicity characteristic leaching procedure analysis of dye containing sludges
… which also leached were identified. Only small amounts of color were detected in the TCLP extracts; the mean ADMI color values for undigested and aerobically digested sludges were 240 and 156 ADMI color units respectively. Concentrations of individual dyes that may have leached into the TCLP …
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ΚΑΤΑΣΚΕΥΗ ΣΥΣΤΗΜΑΤΟΣ ΑΝΑΔΙΑΛΥΤΙΚΗΣ ΠΟΤΕΝΣΙΟΜΕΤΡΙΑΣ ΕΛΕΓΧΟΜΕΝΟΥ ΑΠΟ ΜΙΚΡΟΥΠΟΛΟΓΙΣΤΗ-ΓΕΝΙΚΕΣ ΜΕΛΕΤΕΣ ΣΤΗ ΜΕΘΟΔΟ ΚΑΙ ΑΝΑΛΥΤΙΚΕΣ ΕΦΑΡΜΟΓΕΣ
… OUT. 9. A PROCEDURE FOR THE DETERMINATION OF TRACE AMOUNTS OF INDIUM IN ZINC ORES HAS BEEN DEVELOPED.
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Water and fluorine contents in Mt. Hood magmas recorded by plagioclase phenocrysts
… of minerals and melts, even when present in trace amounts. They impact the phase equilibria (Wyllie 1979; Gaetani and Grove 1998), rheological properties (Dingwell et al. 1985; Hirth and Kohlstedt 1996), and volcanic eruption dynamics (Roggensack et al. 1997; Cashman 2004). H2O is the most …
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An investigation of factors influencing the bioavailability of silver nanoparticles within a terrestrial system
… 25 ppm or higher were found to contain at least trace amounts of silver. Root samples of both plant species were found to contain more silver than the other plant tissues analyzed. By comparing the results from all the various investigations it was found that nanoparticle concentration was the …
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Petrogenesis of the Springfield Granodiorite, southeast Pennsylvania Piedmont
… biotite, epidote (often with allanite cores) and trace amounts of hornblende. Accessory minerals include sphene, magnetite, apatite and zircon. The magmatic assemblage of quartz+two feldspars+biotite+sphene+hornblende+magnetite permits its utilization of AI-in-hornblende as a geobarometer …
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