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 14 of 14 for “"Dithizone"”.
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Studies with dithizone : the extraction of thallium (III)
Thallium(III) reacts with dithizone(I) in a complicated way through a number of intermediate products which depend on the relative proportions of reactants, the pH of the aqueous phase, the order of mixing of reactants, the time of phase equilibrium and the nature of the organic solvent used. The …
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Structural and spectroscopic studies with dithizone and its derivatives
… in the visible absorption spectrum of S-methyldithizone, PhN:N•C(SCH3):N•NHPh, have been shown to arise from syn-anti isomerization about the fonnal C=N double bond and rotation about the C-N single bond by considering the evidence provided by i. r. and n.m.r. spectroscopic studies combined …
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Ferrocenyl derivatives of dithizone : photochromic properties and potential as electrochemical sensors
New ferrocenyl derivatives of dithizone were successfully prepared and characterised by various analytical techniques. In the first part of this project interactions between photochromic and redox properties were investigated for the new ferrocenylmercury dithizonate complexes (N,S-dithizonato …
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Transition metal complexes of bis(diphenylphosphino)methane, dithizone and dithiolenes: structural, spectroscopic, electrochemical and computational studies
… X-ray crystallographic studies were performed on dithizone and its corresponding salt in an attempt to resolve or explain the often debated tautomerism of this molecule in the solid state and in solution. The structure of the parent molecule showed the co-existence of the two tautomeric forms in a …
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The synthesis and investigation of alizan-based functional chromogenic probes for heavy mental sensing in aqueous medium
… organic dye, as well as two organic reagents, dithizone and phenylfluorone for heavy metal detection in borehole water and commercially available water. Sensor AB and EF showed strong colorimetric response upon the molar addition of various cations (including Fe2+, Fe3+, Hg 2+, Co2+, Ag+, Zn2+, …
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Neutron Activation Analysis of Zinc in Biological Samples
… time and remote control manipulation of a dithizone extraction. Dithizone is used on a cellulose acetate column for the method devised by Pierce, et al. After elution of zinc from the column, quinaldic acid is used to precipitate the zinc for counting. Another procedure for determining zinc …
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The Determination of Trace Metals by High Performance Liquid Chromatography with Photometric Detection
… also showed promise. Two photometric reagents, dithizone and eriochrome black T were used as post-column reagents, sensitivity and calibration characteristics are determined. A novel method of photometric detection, observes the decrease in absorbance of the metallochromic indicator used. Using …
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Studies on photochromic and potentially mesogenic mercury(II) dithizonates
… 12, 14 or 18), were prepared by complexation of dithizone (1,5-diphenyl- thiocarbazone, H 2 Dz) with the corresponding 4-(4'-n-alkoxybenzylideneanilino)mercury(II) acetates. The 4-( 4 '-n-alkoxybiphenyl)mercury(II) dithizonates, CₙH₂ₙ₊₁ OC6H4 C6H4- Hg(HDz) (n = 4, 5, 10, 14 or 18), were similarly …
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Identification of the products and mechanism of decomposition of thiazate
… of the compound were somewhat different than dithizone. The purpose of this thesis is to explain the nature of the decomposition of thiazate.</p>
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THE DETERMINATION OF TRACE METALS BY CAPILLARY ELECTROPHORESIS
… of inorganic and organo mercury species as their dithizone sulphonate (DzS) complexes using coated capillary columns is described. The complexes were pre-formed before injection and detection was by direct measurement of the visible absorbance of the complexes. Dithizone sulphonate was used in …
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Development of quantitative methods for quality assessment of islets of Langerhans
… after staining with a zinc-specific binding dye (dithizone, DTZ) and manual counting with normalization on the basis of an islet equivalent (IE), an islet with volume equivalent to that of a sphere with a 150 Pm diameter. Islet viability is based on a live/dead staining test with two fluorescent …
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Some aspects of the analytical chemistry of malathion
… use of a ligand exchange reaction involving dithizone. The resulting final organic extract in this case is bright orange in colour, the absorbance of which can be measured even with simple photometers. The usefulness of the modified colorimetric method has been demonstrated by determining …
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Mineral requirements of selected species of aquatic hyphomycetes
… were purified by the phosphate adsorption and dithizone methods. In addition to nutrient salts and purified water, the media contained only glucose. Since all the species except Clavariopsis aquatica DeWildeman grew well for many transfers and approximately two years on this completely defined …
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Investigations on the development of a novel hybrid sensor for environmental monitoring applications.
… of evanescent waves in optical fibre with dithizone to detect heavy metal ions. A U-bent sensor geometry has been investigated to enhance the optical sensitivity of the sensor through higher evanescent field near the surface. Further, optical field confinement to the surface has been …