Rostislav Y Gerasimov
Bauman Moscow State Technical University, Russia
Title: Determination of the isotopic composition of aqueous solutions radiospectroscopic method
Biography
Biography: Rostislav Y Gerasimov
Abstract
The proposed new method based on the spectra of radio wave radiation of the microwave range wideband scanning receiver. It is experimentally proved that this method has a high accuracy in the determination of the frequency spectrum. This allows to reach a sensitivity of 5-6 Hz/nm. The obtained spectra are analyzed for the particular program hardware-software complex. Practice has shown that the proposed method allows not only to detect the difference of the substances qualitative composition and concentration, but also to determine the presence of heavy and superheavy hydrogen isotopes in water. The method for determining the presence of substances in nanoscopic amounts is based on the registration of radio-wave emission spectra in the microwave region using a scanning wideband receiver [1]. This radiation arises owing to the excitation of alternate high-frequency displacement and conduction currents in an object subjected to testing between the flexible plates of a capacitive working sensor. The results from measurements (the obtained spectra) are analyzed using a hardware–software complex. For the research of aqueous solutions it is important to establish how the structure of water is influenced by temperature [2]. In Fig. 1 shows the changes in the spectra of water temperature. The spectral pattern changes when the water is frozen to ice (spectra 2). Additional peaks emerge in the right side of the spectrum, beginning at a frequency of 2456.54MHz. After the water returns to the liquid state (spectra 3) at the reference temperature (25°C), the spectra differ from the initial one by shifting toward an increase in the frequency of the spectra and a drop in the amplitudes of all peaks. Finally we have to say that:
1. The method of radioscopy in the microwave range, allows you to explore the fluid system, by comparing the spectra of the pure solvent (reference samples) and solutions.
2. In this work, the parameters of the spectra of the standard with bidistilled water and aqueous solutions: individual substances in the analyzed water; the difference of the concentrations of dissolved substances; evaluation of isotopic composition in the system of hydrogen isotopes.
3. It was established experimentally that this method can detect the presence of small quantities of heavy (D) and superheavy (T) hydrogen isotopes in ordinary (H2O) and heavy (D2O) water
Fig. 1 Spectra of water in different states: (1) initial state at 299 K, (2) frozen state at 273 K, (3) thawed state at 299 K.