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Showing 1 to 20 of 56 for “"atomic absorption spectrometry"”.
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REACTIVE GASES IN ELECTROTHERMAL ATOMISATION ATOMIC ABSORPTION SPECTROMETRY
… been used as matrix modifiers in electrothermal atomic absorption spectroscopy (ETAAS). Oxidising gases such as air or nitrous-oxide, introduced during the charring stage, both thermally stabilised analytes such as lead, and improved the efficiency of pyrolysis by converting the normal charring …
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Atomic absorption spectrometry and its application in geochemistry
The atomic absorption method of analysis is reviewed. The theory describing the various phenomena such as atomic population, spectral line shapes, factors influencing absorption, analytical graph curvature, etc.are deduced. The practical aspects of atomic absorption are discussed with respect to: …
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Direct determination of cadmium and beryllium in coal and fly ash slurries using graphite furnace atomic absorption spectrometry
Graphite Furnace Atomic Absorption Spectrometry (GFAAS) was used for the determination of cadmium and beryllium in coal and fly ash slurries. Sample preparation involved grinding the sample to a fine powder and slurrying it in a suitable solvent. Stable slurries were maintained by magnetic stirring …
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Studies on the analytical chemistry of chromium in aqueous solutions
… can be directly determined by graphite furnace atomic absorption spectrometry since the technique has the same sensitivity for both oxidation states of chromium. Because of low concentrations of chromium in the aquatic environment, direct determination of the total chromium concentration in …
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Stroncio nustatymas vaistažolėse liepsnos atominės absorbcinės spektrometrijos metodu /
Determination of Strontium in Herbs by Flame Atomic Absorption Spectrometry Strontium is an alkaline earth metal. A mineral found in a lead mine, Scotland by A.Crawford in 1790. Strontium is a grey, silvery metal that is softer than calcium. Sr is well known from the minerals SrSO4 and SrCO3. …
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Acute dichromate poisoning following the use of toxic purgatives
… elevated levels of chromium were demonstrated by atomic absorption spectrometry in the blood and urine of this patient. Following this case there have been six further cases of acute renal failure resulting from use of dichromate containing traditional remedies. These remedies were obtained from a …
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Acute dichromate poisoning following the use of toxic purgatives
… elevated levels of chromium were demonstrated by atomic absorption spectrometry in the blood and urine of this patient. Following this case there have been six further cases of acute renal failure resulting from use of dichromate containing traditional remedies. These remedies were obtained from a …
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The Determination of Lead and Cadmium in Tobacco Using High Performance Liquid Chromatography and Dithiocarbamate Derivitization.
… The tobacco samples were also analyzed using atomic absorption spectrometry. Foreign tobacco brands that contained clove as a spice showed lower levels of cadmium and lead.</p>
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DESORPTION OF COPPER FROM ILLITE CLAY USING A CHELATING RESIN ENCAPSULATED BETWEEN POROUS MEMBRANES
… closely by experimental data obtained with atomic absorption spectrometry. To study the release characteristics of trace metals, illite clay was "contaminated" with known amounts of trace metals and suspended in aqueous solutions. Continuous agitation was provided. As the cassette removes …
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COMPARATIVE EFFECTS OF GIBBERELLIC ACID AND N(6)-BENZYLADENINE ON GROWTH AND DEVELOPMENT OF DWARF WATERMELON SEEDLINGS
… by a colorimetric procedure and cations by atomic absorption spectrometry confirmed that GA promoted the accumulation of osmotically active solutes in the cotyledons and hypocotyls.</p>
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The development of analytical methods to elucidate the chemical forms of Cu, Zn, Cd and Pb in soil contaminated by sewage sludge and other effluents.
… technique was interfaced to Graphite Furnace Atomic Absorption Spectrometry in order to detect the copper content of the various soil solution species. Chapter five extends the above technique to the studv of the long term partioning of copper in water extracts of sewage sludge and distillery …
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Monitoring Metal Containing Particulates Distribution on a College Campus Using Dandelion (<em>Taraxacum officinale</em>) Leaves as Receptors.
… from the long-term atmospheric deposition or absorption of metals from soil a seasonal plant, dandelion, was used to monitor the metal contents. The metals monitored are cadmium, calcium, copper, chromium, iron, lead, and zinc. Fourteen sites were monitored and samples were collected once a …
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CMB7 receptor modelling of airborne particulate matter in the Vaal Triangle
… (EDXRFS), inductively coupled plasma mass spectrometry (ICP-MS) and Atomic Absorption Spectrometry (AAS). The quartz fibre filters were used for the determination of water soluble ions and carbon by Ion Chromatography (IC), and Thermal Optical Reflectance (TOR) respectively. Elemental and …
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Arsenic contamination study of drinking water in Nepal
… to the U.S. for analysis using Graphite Furnace Atomic Absorption Spectrometry. Combined results from these tests indicate that no arsenic contamination was found above the World Health Organization (WHO) maximum contaminant level of 10ppb in the Kathmandu Valley. However, 18% of samples taken …
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Investigations concerning the reactions of small molecules with a series of pentacoordinate manganese complexes and the characterization of a solvent refined coal
… Solvent Refined Coal were made using flameless atomic absorption spectrometry. The Solvent Refined Coal was shown to contain substantial quantities of catalytic metals and metals of environmental concern. Electron Spin Resonance measurements yielded signals assignable to organic free radicals …
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ΜΕΛΕΤΗ ΠΡΟΣΔΙΟΡΙΣΜΟΥ ΕΝΩΣΕΩΝ ΥΔΡΑΡΓΥΡΟΥ ΜΕ ΤΗ ΦΑΣΜΑΤΟΜΕΤΡΙΑ ΑΤΟΜΙΚΗΣ ΑΠΟΡΡΟΦΗΣΗΣ ΨΥΧΡΟΥ ΑΤΜΟΥ ΚΑΙ ΒΕΛΤΙΣΤΟΠΟΙΗΣΗ ΜΕ ΠΑΡΑΓΟΝΤΙΚΟ ΣΧΕΔΙΑ...
… OF THIS WORK WAS THE OPTIMIZATION OF COLD VAPOR ATOMIC ABSORPTION SPECTROMETRY, WHICH IS USED AT MERCURY DETERMINATIONS. THE METHOD WAS OPTIMIZED EITHER AS DIRECT DETERMINATION WITHOUT PRECONCENTRATION AND WITH PRECONCENTRATIONON A AU-PT AMALGAMATOR . IN THE FIRST CASE THE OPTIMIZATION WAS …
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Metal ion removal by adsorptive bubble separation methods
… concentration was determined by cold vapour atomic absorption spectrometry. The effect of pH, admitted water volume, coagulation time, and nature and quantity of added tensides and polymeric flocculants was studied using experimentally established optimum removal conditions. The optimum …
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Environmental Impacts of Tin Mine Waste: A Case Study of the Zaaiplaats Tin Mine, Limpopo Province, South Africa
… the University of Venda using X-ray Fluorescence Spectrometry. The maximum values were 2842.4 ppm, 885.1 ppm, and 740.7 ppm for lead from Heap B followed by copper, and zinc from the river channel respectively. The distribution pattern of some metals like lead, zinc and copper were increasing with …
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Entwicklung und Anwendung eines neuartigen Analysenverfahrens zur Bestimmung von Quecksilber(II) mit Hilfe der FI-CVAAS
In the instrumental atomic absorption spectrometry (Cold Vapour AAS), the conventional use of sodium hydroxide for the quantitative determination of mercury was limited to its function as a stabilizing reagent for the hydrid forming reductant sodium tetrahydroborate. An unique property of hydroxyl …
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