Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"XAD"”.
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Développement de méthodes analytiques par chromatographie en phase gazeuse et chromatographie en phase liquide à haute performance pour le fenitrothion et sept de ses dérivés de l'eau et du sol à l'aide des résines XAD 2, 4 et 7
… de ses dérivés à l'aide des résines Amberlite(R) XAD a été étudié en utilisant la chromatographie en phase gazeuse (CPG) et la chromatographie en phase liquide à haute performance (CLHP) comme moyens d'analyse. Les synthèses du S-méthylfénitrothion, du formylfénitrothion, de l'aminofénitrothion, …
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Fate of Current-use Pesticides in the Canadian Atmosphere
… transport (LRT). We have applied and refined an XAD-2 resin-based passive air sampler (PAS) to study the concentrations of pesticides in the atmosphere. A set of laboratory experiments measured the equilibria sorption coefficients for chemicals on XAD-2 resin, allowing the determination of a new …
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Trennung von Ionen Seltener Erdelemente mittels Extraktionschromatographie unter Nutzung Solvent imprägnierter Harze
In dieser Arbeit wurde der Einsatz von Amberlite XAD 7 HP imprägniert mit Di-(2-ethylhexyl)phosphorsäure als Solvent imprägniertes Harz für die Trennung von Ionen Seltener Erdelemente in einer Trennsäule untersucht. Mittels Batchversuchen wurden die Extraktionsisothermen und Extraktionskinetiken …
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Toxicity mechanism of anthropogenic water contaminants: drinking water disinfection by-products (haloacetic acids) and particle associated contaminants from sealcoats (polyaromatic hydrocarbons) in lake sediments
… wastewater effluents extracted with XAD-8 and XAD-4 resins was evaluated. For chlorinated water, the organic extracts eluted from XAD-8 were more cytotoxic than that of the chloraminated wastewater extracts. However, the XAD-4 extracts of the chlorinated wastewaters and chloraminated …
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Ungesättigte Dithioetherliganden : selektive Extraktionsmittel für die Gewinnung von Palladium(II) aus Sekundärrohstoffen
… Kieselgel und organophilem Amberlite® XAD 2 adsorbiert. Die Oligo(dithioether)-Liganden basieren auf 1,2-Dithiobenzen oder 1,2-Dithiomaleonitril-Einheiten, welche über Tris(oxyethylen)ethylen- oder Trimethylen-Brücken miteinander verknüpft sind. Mit Hilfe von Batch-Versuchen konnte …
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Combustion emissions from conventional boiler firing coal and tire derived fuel
… with an ENERAC 2000 gas analyzer. Supelco XAD-2 resin was used in the modified method 5 sampling train to adsorb nonpolar, vapor phase hydrocarbons. The XAD-2 resin was extracted and the wash concentrated before High Performance Liquid Chromatography (HPLC) was used to quantify the presence …
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Separación de aminoácidos y derivados utilizando resinas impregnadas de extractante
… se ha empleado como soporte polimérico Amberlita XAD-4 y como extractante cloruro de tri-alquilmetilamonio (Tomac) para la separación selectiva de los aminoácidos y ácido dinonilnaftalensulfónico (DNNSA) para la de betaína. Este estudio se basa en los principios que gobiernan la transferencia de …
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Identifying iron-binding antioxidants in New Zealand honeydew honey
… of the antioxidants was first attempted with XAD-2 resin. The results of solid phase extraction using XAD-2 resin showed that the activity is mainly found in the honey effluent, the fraction not retarded by the resin, indicating that hydrophilic components contributed to the iron-binding …
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Halogenorganische Verbindungen in Umweltkompartimenten
… Molekülfiltration. Verwendet wurden Amberlite XAD-8, Duolite A-7 und Sephadex G 25. Nur eine kleine Fraktion besteht aus unpolaren, nicht ionischen und kleinen halogenierten Komponenten. Gerade diese Komponenten werden durch Gaschromatographie leicht nachgewiesen. Dieses ist der Grund für die …
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Effect of canopy manipulation and fermentation on grape aroma components
… on those components. A polymeric styrene resin (XAD-2) was evaluated for its ability to absorb and desorb five monoterpene alcohols, three monoterpene hydrocarbons, four monterpene oxides, two aromatic alcohols and a glucopyranoside from White Riesling juice at two different pH values. The …
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Method Development For Concentration Measurements of SVOCs and Analysis of Ambient Samples
… by GC-MS. In this project, the newly developed XAD-4TM SIF was modified, developed and tested to determine its suitability for ambient concentration measurements of other classes of SVOCs like PAHs and n-alkanes. The results of the method validation tests show that the XAD-4TM SIF technique can …
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Understanding of pesticides in waters and soils using a novel in situ dynamic sampling technique
… future. Two types of binding material (HLB and XAD 18) were used and compared. Laboratory testing was carried out with various controlled experiments. HLB showed higher binding capacity but with slower uptake than XAD 18. The principle of DGT was confirmed as the mass accumulated by DGT was …
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Primate-Plant Interactions in the Tropical Dry Forests of Northwestern Madagascar: Seed Dispersal and Sensory Ecology of Eulemur fulvus.
… a modified force gauge and fruit odor using XAD filtration and gas chromatography-mass spectrometry. I determine that many ripe fruits colors are conspicuous to brown lemurs against a background of leaves, and that ripe fruits are significantly different chromatically from unripe fruits. I …
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Strategies for reducing the mutagen content of chlorinated aqueous media
… the non-polar, polymeric resin, Amberlite XAD-4, was successful. As these system conditions are comparable to those present in drinking water treatment facilities, application of this resin to such systems should be investigated. However, typical concentrations of the chlorinated mutagen …
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Characterization of chemically fixed nitrogen-15-labeled liquid anhydrous ammonia and of biologically immobilized nitrogen-15 in typical Illinois mollisols
… nonhumic substances by sorption-desorption from XAD-8 resin. The results show that: (1) chemical fixation by soil organic matter accounted for 36% of the total fixed NH$\sb3$; clay fixation accounted for 52%; (2) of the chemically fixed NH$\sb3$-N, 55% was recovered in the FA fraction and 17% as …
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Removal of selected water disinfection byproducts, and MTBE in batch and continuous flow systems using alternative sorbents.
… with unique surface characteristics, Amberlite® XAD-16, a weakly basic anion exchange resin, Amberjet®, a strongly basic anion exchange resin, and granular activated carbon (GAC). Batch experiments were conducted on spiked Milli-Q® and lake water matrices. Results indicate considerable sorption …
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Dissolved Organic Matter Characterization and Impact on Mercury Binding in an Urbanizing Watershed
… collected and isolated using Amberlite DAX-8 and XAD-4 resins into operationally defined hydrophobic and hydrophilic acid fractions. Each fraction was characterized for chemical and spectral properties prior to an assessment of Hg-DOM fraction binding by measuring conditional stability constants …
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Profiling of urinary metabolites in human pregnancy
… by adsorption onto a neutral resin (Amberlite XAD-2). Steroid conjugates were hydrolyzed by enzymes from the digestive juice of the snail, Helix pomatia. Purified urinary organic acid and steroid extracts were methoximated and trimethylsilylated for gas-chromatographic analysis. Urinary acid …
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Development and application of fractionation procedure for drinking water organic matters
… protocol was presented with triple columns of XAD-8 adsorption resin, one column of AG-MP-50 cationic resin, and another column of WA 10 weak anionic resin in sequence. This protocol was experimented and confirmed for its efficiency (+/- 10% loss of mass) with samples from Canal Road (CR) and …
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Management strategy of landfill leachate and landfill gas condensate
… organic nitrogen species in landfill leachates. XAD-8 resin was employed to isolate the hydrophilic fraction of leachate samples, hydrophilic organic nitrogen was found to be more biodegradable/bioavailable than the hydrophobic fractions. Furthermore, biological and physical-chemical treatment …
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