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An Investigation Of Column Efficiency And The Relationship To Liquid Phase Distribution On Ultra-Low Loaded Glass Bead Gas Chromatographic Columns, Donald G. Nyberg

Theses and Dissertations

Studies have been made of column efficiencies, extra-column effects, the liquid phase mass transfer term (C_l), and liquid phase distribution at ultra-low liquid loadings on glass bead gas-liquid chromatographic columns. The advantages of using lightly loaded columns are described in detail along with a critical evaluation of the limitations of this liquid phase reduction ad infinitum. Theories have been presented by Giddings^22,23,25,30,32 which predict the mass transfer term (C_l) as a function of two extreme liquid phase distributions. The first equation assumes 100% "capillary" liquid held at the glass bead contact points and represents a very inefficient column. This prediction …

Isolation And Partial Characterization Of The Toxic Substance From Eremocarpus Setigerus Benth, Shuliang Lee

Loma Linda University Electronic Theses, Dissertations & Projects

The work on the active substance of Eremocarpus setigerus Benth has been previously performed by Naito and Noller. However, the investigation was not complete. Therefore we isolated and tested this substance by steam distillation and thin layer chromatography technique. A yellow sticky toxic substance was isolated with Rf values of 0.15 in benzene system and 0.57 in benzene-absolute ethanol (95:5 v/v) system.

The toxic substance which is free of halogen, nitrogen, and sulfur, is soluble in ethyl ether, ethanol, and concentrated sulfuric acid. It has a maximum absorption in the ultraviolet region that indicates the presence of unsaturation. Its infrared …

The Approximate Scf Lcao-Mo With Cndo Theory And Electronic Structures Of N-Heterocyclic Benzene Analogues, Jay Jea-Yong Rhee

Chemistry and Chemical Biology ETDs

The approximate MO theory in this study expIicitly refers to the Pople molecular orbitaI treatment. This consists of complete neglect of differential overlap (CNOO) in the self-consistent field treatment of the molecular orbitals, analogous to the Hartree-Fock treatment of atomic systems, which are constructed as Iinear combinations of atomic orbitals (LCAO). Furthermore, the only orbital functions considered in a basis set are those for the valence electrons and the atomic orbitals are Slater-type orbitals. The major investigation of this study is to apply this approximate MO theory to the series of nitrogen heterocyclic benzene analogues. The quantities that have been …

Kinetics Of The Thermal Decomposition Of Acetonitrile, Thomas William Asmus

Masters Theses

No abstract provided.

Fluorescence Studies Of Cobalt (Iii) Complexes, Arnold T. Weibel

Masters Theses

No abstract provided.

Radiolysis Of Liquid Propane: Radical Reactions, Robert D. Koob, Larry Kevan

Office of the Provost Scholarship

The radical reactions in the liquid phase γ-radiolysis of propane have been studied from –130 to 35°C and compared with the gas-phase radiolysis at 35°C. Oxygen was used as a scavenger to separate thermal radical yields, and effects of phase and temperature on the radical yields were assessed. The gas-liquid phase change(a) decreases total decomposition by about 14%,(b) increases disproportionation/combination (D/C) ratios for all radicals by 30% and (c) decreases the isopropyl/n-propyl radical ratio. The decrease in liquid temperature (a) changes the predominant reaction of H atoms from abstraction from propane to addition to product propylene below –78°C at doses …

An Investigation Of Amino Acid Decomposition, Jack H. Frost, E. Winston Grundmeier

Journal of the Minnesota Academy of Science

Amino acid decarboxylation studies generally show that extraneous reactions accompany CO, formation, especially at high temperature and when metal ion catalysts are used. In the present study some of these reactions are investigated in the reaction system, a- or ,a-amino acid and CuSO, at 130-155° C. Histidine, a- and .B -alanine, glycerine and norvaline were each studied for determination of products. The extent of formation of the products, NH,, CO,, aliphatic amines and Cu metal, was determined quantitatively. A near l: l correspondence in NH,:CO2 exists for the amino acids studied. No correspondence could be detected between Cu metal product …

The Phosphorus Fertilisers : How They Compare, Walter Jacob Cox

Journal of the Department of Agriculture, Western Australia, Series 4

ALTHOUGH 'double' or 'concentrated' superphosphate was first commercially manufactured in 1872 it was not until the 1950's that it became a major commercial fertiliser. In 1965 it accounted for about 15 per cent, of the world production of phosphatic fertilisers.

Heterocyclic Aromatic Fluorides By A Modified Schiemann Method (1), Frank L. Setliff

Journal of the Arkansas Academy of Science

No abstract provided.

N-P Compound Fertilisers, M G. Mason, W. J. Cox, R. N. Glencross

Journal of the Department of Agriculture, Western Australia, Series 4

FARMERS were able to buy the two compound fertilisers N-P Compound Fertiliser 28:14 and N-P Compound Fertilser 24:24 in the 1967 season.

Copper, Zinc And Molybdenum Fertilizers For New Land Crops And Pastures : 1969, J W. Gartrell, R. N. Glencross

Journal of the Department of Agriculture, Western Australia, Series 4

Four years of intensive research into soil deficiencies in developing areas have resulted in a more comprehensive understanding of the need for trace elements in Western Australia.

An Investigation Of The Feasibility Of Making Radiometric Titrations Of Precipitation Reactions, Harold Elmore Hammerstrom

University of the Pacific Theses and Dissertations

The purpose of the present work was to (1) determine the feasibility of performing radiometric titrations using low activity radioisotopes and inexpensive equipment; (2) develop a workable procedure for performing ·radiometric titrations in the classroom; and (3) assemble the basic radioactive concepts needed so the content could be used in a chemistry course of study.

The limited work done previously with radiometric titrations has used solutions of high specific activity and relatively large volumes of solution. The use of high activity radioisotopes creates problems of radioisotope procurement, shielding, handling and disposal. The use of high activity radioisotopes required special training …

A Spectrophotometric Study Of The System: Cobalt--2,2,8,8-Tetrakis (Hydroxymethyl)-3,7-Diaza-1,5,9-Nonanetriol, Pauline Frances Fones

Master's Theses

Spectrophotometric studies or solutions or 2,2;8;a. tetrakis(hydroxymethyl)-3, 7-diaza-1,5.9-nonanetriol, (HOCH₂),₃CHNCH₂CH(OH)CH₂NHC(CH₂OH)₃, with cobalt (II) gave evidence of complexes having metal-ligand ratios of 1:2 and 1:3. Complexation appeared nearly complete at pH 8 or greater. Between pH 8 and pH 11, the positions of the maxima in the absorbance spectra remained essentially constant and no precipitation was observed. The 1:2 complex formed rapidly, while the 1:3 complex formed more slowly, requiring one to two weeks to reach equilibrium, after which the solutions remained unchanged over a period or several months. Evidence …

Dehydration And Rehydration Behavior Of Zinc And Magnesium Sulfate Heptahydrates, Hanaa Youssef Ghorab

Archived Theses and Dissertations

No abstract provided.

Catalytic Decomposition Of Hydrogen Peroxide By Manganese-Doped Magnesium Hydroxide, Nabih Philobbos Kelada

Archived Theses and Dissertations

No abstract provided.

Active Magnesium Oxide Prepared From Magnesium Oxalate Dihydrate, Jehane Nour El Dine Ragai

Archived Theses and Dissertations

No abstract provided.

The Synthesis And Characterization Of 4-Cyanopyridine Complexes Of Chromium (Iii) Chloride, Marcus Alfred Haile

Dissertations and Theses @ UNI

The preparation of a 4-cyanopyridine complex of chromium(III) chloride by two methods is described. The first method involved the mixing of 1-butanol solutions of 4-cyanopyridine and chrornium (III) chloride 6-hydrate at so0 c and the second involved the addition of chromium(III) chloride 6-hydrate to molten 4-cyanopyridine. The complex has been determined by elemental analysis and conductivity measurements as dichloroaquotris (4-cyanopyridine)chromium(III) chloride, [CrCl2(H20)(C6H4N2)3JCl. The compound was studied using infrared spectroscopy in the wavelength range 4000-700 cm-1 , with the bonding site on the 4-cyanopyridine indicated as nitrogen of the pyridine ring but not nitrogen of the nitrile group. Additional 4-cyanopyridine complexes …

Surface Interactions Between Nickel Ions And Sodium Dodecyl Sulfate, Ralph Edward Coleman

Masters Theses

"In this research the interaction of nickel ions with the surfactant sodium dodecyl sulfate at the liquid-air interface was studied. Surface tension measurements were performed on pure sodium dodecyl sulfate solutions, with and without the addition of nickel ions. Results of these measurements showed that the addition of nickel ions lowered the equilibrium surface tension values of pure sodium dodecyl sulfate solutions and shifted the critical micelle concentration to lower concentrations. The foam fractionation technique was used to determine if the nickel ions could be removed from surfactant solutions. It was found that the removal of nickel ions was influenced …

The Effect Of Impurities On The Time Dependence Of The Surface Tension Of Aqueous Surfactant Systems, Elizabeth Ann Munson

Masters Theses

"In this study surface tension measurements were made on tetradecylpyridinium bromide (TPB) solutions both in water in solutions containing various concentrations of impurities. Three impurities were studied, dodecyl alcohol, decyl alcohol and dodecylpyridinium bromide. Surface tension vs. time plots were constructed and show a definite dependence on the concentration of the impurity added. As the concentration of the impurity increases the equilibrium surface tension decreases. The decrease in the equilibrium surface tension is also dependent upon the concentration of the tetradecylpyridinium bromide. As the concentration of the surfactant (TPB) increases the effect of the impurity is reduced"--Abstract, page i.

A Study Of Solvent Effects On The Reaction Between P-Nitrobenzyl Chloride And Hydroxide Ion In Aqueous Dioxane Homogeneous Media, Ken K. Ho

Masters Theses

"The kinetics and activation parameters of the reaction between p̲, p̲' - dinitrostilbene quantitatively, have been studied in five aqueous dioxane solvent systems at five different temperatures between 20⁰ and 40⁰C. At any one temperature the second-order rate constants are minimum in the 30% dioxane solvent mixture, reach a maximum in the 50% dioxane systems, and fall off slightly in the 60% and 70% dioxane systems. The Arrhenius activation energies are highest in the 30% dioxane and lowest in the 70% dioxane systems. The free energies of activation change in the same direction but the magnitude of change is much …

Geochemical Abundance Of Iodine, Jane Hanisch Bennett

Masters Theses

"The research reported herein includes unpublished iodine and uranium data on a group of United States Geological Survey standards and on a group of ultrabasic rocks. Data are also included for the major rock types, deep sea sediments, and for graphite and troilite inclusions in iron meteorites. Tellurium data for the troilite are also reported. Appendix I is a literature article (Bennett and Manuel, 1967a) on Canyon Diablo Graphite. Appendix II is a literature article (Bennett and Manuel, 1967b) on deep sea sediments. The results of this study show that most of the earlier estimates of the crustal abundance of …

A Kinetic Investigation Of The Reaction Of Ethylenedinitrilotetraacetic Acid (Edta) And Cerium (Iv) In Acid Solution, Sahmia K. Al-Hashimi

Masters Theses

"The reaction between Ce(IV) salt solutions and EDTA solution was followed titrimetrically and spectrophotometrically and found to occur in stages. Four equivalents of Ce(IV) are reduced per mole of EDTA almost instantaneously at room temperature or even lower. With increasing temperature and reaction time an ultimate of about 14 equivalents of Ce(IV) is consumer per mole of EDTA. Formaldehyde, carbon dioxide, and other unidentified compounds are the products of oxidation of EDTA with Ce(IV). The kinetics of the reaction in aqueous sulfuric acid (0.09 - 2.95 M̲) was studied over the temperature range 11.7-40⁰ by a spectrophotometric technique. In the …

A Study Of The Precipitation Of Lead Bromide Fluoride At Low Ph Values In The Presence Of Boron, David W. Freund

Bachelors’ Theses

The determination of fluorine has been an important analytical problem for some time. Volumetric, gravimetric and instrumental methods have been used with some degree of success. Each of these methods have been limited in some way and no completely satisfactory method for the determination of fluorine has been found. The most popular of these methods is the determination of fluorine as lead chloride fluoride. This method has the advantage of giving reasonably accurate results and the lead chloride fluoride precipitate gives an excellent conversion factor for fluorine due to its high molecular weight. The procedure requires no special or expensive …

The Function And Use Of Sulphur Dioxide In West Australian Winemaking, D Mann

Journal of the Department of Agriculture, Western Australia, Series 4

THE judicious use of sulphur dioxide is perhaps the most important of the fundamentals of winemaking in a hot climate.

Western Australia's vintage, centred in the Swan Valley just a few miles north-east of Perth, is subjected to some of the highest summer temperatures experienced by a quality wine producing district.

In this environment, it is important to make good use of sulphur dioxide to avoid wine spoilage.

The Dispersing Power Of Oxidized Starches On Aqueous Pigment Suspensions, Louis K. Wilhelm

Masters Theses

No abstract provided.

An Attempted Preparation Of Cis-Diiodobis (Ethylenediamine) Chromium (Iii) Iodide, Douglas J. Harper

Dissertations and Theses @ UNI

An investigation of the preparation of CIS-diiodobis (ethylenediamine) Chromium (III) iodide was made. All attempts to prepare and characterize the salt failed. The thermal matrix preparation described by Wendlandt and Sveum could not be duplicated.

A Short Route To Benzyl Beta-D-Glycosides Of 2-Amino-2-Deoxy-D-Glucose And -D-Allose And Elimination Of The 3-Sulfonate From Benzyl 4,6-O-Benzylidene-2-Benzyloxycarbonylamido-2-Deoxy-3-O-(Methylsulfonyl)- Beta-D-Glucopyranoside, William Denham Rhoads

University of the Pacific Theses and Dissertations

It is one purpose of this dissertation to introduce a facile method for the preparation of β glycosides of D-glucose and D-allose.

It is the second purpose of this dissertation to investigate the preparation of 2-oxazolidinones forming a bridge between C₂ and C₃ of allopyranose. This preparation, along with the facile preparation of β-benzyl glycosides of D-glucosamine and D-allosamine, should lead to compounds which, in a few steps, can conceivably be used for coupling at positions 1 and 4.

Mathematics Of The Variation And Mole Ratio Methods Of Complex Determination, James O. Wear

Journal of the Arkansas Academy of Science

No abstract provided.

A Study Of The Birch Reduction Of M-Methoxybenzamide, Luther Dickson

University of the Pacific Theses and Dissertations

This thesis is (1) an investigation in the identity of the unknown material Qazi (20) obtained when benzamide was reduced at the boiling point of ammonia with 3.3 equivalents of sodium and ethanol, (2) characterization of the components of the brown liquid obtained when m-methoxybenzamide was reduced with a large excess of sodium (8 equivalents of more), and (3) characterization of the compound formed when the latter is subjected to sudden heat.

Endogenous Metabolism Of Polyporus Sulfureus. : Utilization Of Exogenous Carbohydrates And Fatty Acids, Shu-Mei Wang

Masters Theses

"A strain of Polyporus sulfureus from the collection at the University of Missouri at Rolla was used in this investigation. Organisms of this genus have been reported to produce eburicoic acid in good yield and this was confirmed for the organism used in this study by the isolation and identification of eburicoic acid from the mycelium. Growth studies of this organism showed that 4% malt extract is a better medium than synthetic media containing asparagine, nitrate or nitrate plus 0.5% yeast extract as nitrogen sources. An examination of the pH of the culture medium led to the conclusion that regardless …