C. Sc. Dissertations
Valerii V. Chernysh, 2002, "Application of Thermal-Lens Spectrometry for Studying Peculiarities of Chemical Interactions at the Trace Level of Components (by the Examples of Several Analytical Systems)"
Mikhail A. Proskurnin, 1993, "Analytical Thermal Lens Spectrometry: the Development of the Instrumentation and Data Handling Methods by the Example of Determination of Organic Substances and Metal Cations under Batch Conditions and in the Flow"
The study overviews the possibilities of thermal-lensing in analytical chemistry and chemical analysis.
(1) The instrumentation aspects include the optimization of the optical-scheme designs with a single-channel and multichannel schemes providing the maximum reproducibility of thermal-lensing and the longest calibration ranges.
(2) The possibilities in inorganic analysis are illustrated by the determination of bismuth with iodide and molybdenum with thiocyanate with the limits of detection of pg/mL -- ng/mL and the analysis of real samples of seawater and high-purity metals. It is shown that the determination of bismuth by thermal lensing is more selective and reproducible than its photometric counterpart.
(3) The possibilities in organic analysis are exemplified by the analysis of theophylline as a well-known pharmaceutical substance and acetylcholine as an important agent in nerve system.
(4) Flow applications of thermal lensing include flow-injection determination of 16 transition metals using several analytical reagents like dithizone, xylenol orange and TAR.
Vera A. Filichkina, 1993, "The Application of Thermal-Lens Spectrometry for the Determination of Ultratrace Amounts of Cobalt, Iron, and Nickel"
The main idea of this study is the use of binary organo-aqueous mixtures for enhancing the limits of detection and determination of metal chelates by thermal lensing. The theoretical calculations of thermal-lens effect in several binary mixtures were made, and experiments showed good concordance with the theory. The parameters---solvent properties, cell pathlength, the difference between pump laser wavelength and absorption-band maximum, etc---affecting the accuracy and precision of thermal-lens measurements of transition-metal chelates were studied. The procedures for determining cobalt with nitroso-naphthols, iron with 1,10-phenanthroline, and nickel with dimethylglyoxime were developed. The limits of determination are in pg/mL -- ng/mL range.
Dissertations in Progress
|
Author |
Provisional Title |
Started |
Reference |
| Vera V. Kuznetsova | The Hyphenation of Thermal Lensing and Kinetic Methods of Analysis as a New Hyphenated Method | 1998 | See current topics |
| Mikhail Yu. Kononets | The Application of Photothermal Spectroscopy for Studying Sorption at the Level of Nanogram Amounts at Glasses and Silica | 2000 | See current topics |
| Adelina P. Smirnova | The Use of Thermal Lens Spectrometry for the Investigation of Solvent-Extraction Equilibria at the Nanogram Level | 2000 | |
| Svetlana N. Bendrysheva | The Hyphenation of Thermal Lensing with Capillary Electrophoresis | 2001 | |
| Nataliya V. Orlova | The Determiantion of Trace Endotoxins by Thermal Lens Spectrometry | 2001 | See current topics |
