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.
Results
Showing 1 to 20 of 73 for “"exchange resin"”.
-
A study of the decay of acid cationic ion exchange resin
A study was undertaken on the decay of acid ion exchange resin from both a qualitative and quantitative perspective. The qualitative study concentrated on observing the impact on resin strength of varying electrolyte concentrations and varying di-vinyl benzene contents, during the loading phase. …
-
Measuring Bioavailable Copper in Estuarine Waters using an Ion Exchange Resin
Anion exchange methods were used to measure the percent of weakly bound and strongly bound copper in estuarine waters and agricultural drainage. Copper bound to an ion exchange resin has been operationally defined as bioavailable copper, or copper that is available for uptake by aquatic organisms. …
-
The effect of cross-linkage on internal diffusion in Dowex-50 ion exchange resin
… agricultural chemists, that the idea of actual exchange of ions was proposed. Ion exchange has been investigated extensively, resulting in applications to softening of water, purification of sugar, separation of compounds, recovery of metals, many pharmaceutical separations and many …
-
Separation and purification of uranium and thorium from organic liquids on an anionic exchange resin
Digitized by Kansas State University Libraries
-
Separation and purification of uranium and thorium from organic liquids on an anionic exchange resin
Digitized by Kansas State University Libraries
-
The catalytic conversion of low chain length hydrocarbons to liquid fuels using ion exchange resin
The use of ion exchange resins in the polymerization of a c 4 -mixture to liquid fuels has shown that the catalyst is highly active, deactivates at a slow rate and selectively produces mainly dimers. Macropore diffusion resistance strongly influences the overall rate of the reaction. An increase in …
-
Improving the selectivity of the radio-labelling of ion exchange resin tracers for positron emission particle tracking
… activity of radionuclides. Organic ion exchange resins are suitable tracer materials for PEPT experiments, and are usually labelled with ⁶⁸Ga at the laboratories of PEPT Cape Town. The labelling performance relies on the chemical and physical properties of organic strongly acidic cation …
-
Part One: Catalytic Reactions of Anion-Exchange Resin Bound Dodecarhodium Triacontacarbonyl Dianion and Its Derivatives and Part Two: Properties and Reactions of Neutral Non-Polar Solvent Soluble Binuclear Complexes
The resin support was the Dowes 1-X8 anion exchange resin in the chloride form. Exchange of the cluster at room temperature under an inert atmosphere leads to intact Rh(,12) (CO)(,30)('2-) being bound. This material exhibits only limited activity for the hydroformylation of of 1-hexene, accompanied …
-
LITERATURE REVIEW: The Use of Cation-Exchange Resins in Natural Water Trace Metals Research. ARTICLE: Determination of Free Ion Trace Metal Concentrations in Freshwaters Using Cation-Exchange Resin Equilibrium. A Preliminary Investigation.
… ligands and colloidal surfaces. Use of cation exchange resins, particularly Chelex-100, has been developed over the past few decades and enables preconcentration to yield, upon elution, measurable concentrations of trace metals. These resins can also yield data on the speciation (by measuring …
-
Silica Based Solid Phase Extraction Sorbent with a Removable Alkyltrimethylammonium Surfactant Phase
… immobilized onto hydrophilic strong cation exchange resin. The surfactant chain through hydrophobic interactions extracts hydrophobic analytes in the same manner as conventional bonded alkyl moieties on silica based non-polar sorbents. For the extraction of very hydrophobic species with …
-
An investigation on the removal of escherichia coli by ion exchange resins
… evaluate the ability of typical cation and anion exchange resins to remove Escherichia coli from water. The objective was to obtain a method of purifying slightly polluted, private well water supplies. The investigation consisted of passing water samples, inoculated with known concentrations of …
-
An Immobolized Surfactant Extraction Technique Compatible with High Performance Liquid Chromatography-Ultraviolet Visible Detection
… are immobilized onto a strong cationic exchange resin through ion exchange. This surfactant-resin material is placed in a column and aqueous solutions containing analytes are passed through. The analytes are retained by the long carbon chain of the surfactant molecules and by the …
-
An Investigation of the destruction of ion exchange resins
Ion exchange resins are used for many purposes in various areas of science and commerce. One example is the use of cation exchange resins in the nuclear industry for the clean up of radioactively contaminated water (for example the removal of 137Cs). However, during removal of radionuclides, the …
-
Understanding the nonaqueous partitioning of per- and poly-fluoroalkyl substances (PFAS)
… a potential PFAS removal technique using ion exchange resin received attention. However, the natural or recycled water environments are complex and the water matrix components, such as inorganic ions and organic matter, influence the removal efficiency of ion exchange resin. Given this, the …
-
Removal of selected water disinfection byproducts, and MTBE in batch and continuous flow systems using alternative sorbents.
… 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 of TCE (68.9%), slight …
-
The cross-flow chromatographic separation of carbohydrate mixtures
… 12mm wide. The annular space is filled with ion-exchange resin. The upper and lower surfaces of the annulus are enclosed by stainless steel flanges. The entire bed is rotated slowly at speeds of up to four revolutions per hour. Feed solutions are introduced via a Stationary inlet distributor into …
-
Chloramine and MIEX control of disinfection by-products formed from an alluvial aquifer water source
… Distribution System (SDS) tests. Magnetic Ion Exchange Resin, namely MIEX[copyright]DOC, is a strong-base anion exchange resin containing quaternary amine functional groups that serve for anion exchange. Its small size, macroporous structure, and innovative integration of iron oxide allow it to …
-
Polymer-supported reagents for disinfection of water
A macroporous poly(styrene-co-divinylbenzene) resin having redox N,N-dichlorosulfonamide group, was modified for use in small-scale chlorination of potable water. The resin was synthesized via sulfonyl chloride by modification of the strong acid cation exchange resin, Amberlyst-15. The products …
-
Resin-based method for concentration of enteric viruses and F-RNA coliphages from water samples
… of water microbiological safety. Here, a resin-based virus concentration method was developed and tested. The method is based on adsorption of the viruses to an anion exchange resin dispersed in the water sample, followed by direct isolation of nucleic acids from the resin to provide a …
-
The Separation of Carbohydrates by Continuous Production Scale Chromatography
… operation of the SCCR has been reported. An ion exchange resin, Zerolit 225, which was charged in the calcium form, was used as the stationary phase. Deionised water was the mobile phase. For what is believed to be the first time, a complete separation of a fructose-glucose mixture into two 99.9% …
Page 1 of 4