Extracting photometric determination of antimony with 5–pyridylazo–2–monoethylaminoparacresol (PAAC)

The developed extraction-spectrophotometric method for the determination of antimony utilizing 5-(pyridylazo)-2-monoethylaminoparacresol (PAAC) stands out for its selectivity, sensitivity, and rapidity. This method proves to be effective in the determination of antimony in various complex matrices, including model solutions of silicate rocks and ores. The robustness of the method is evident as it successfully analyzes these samples without the need for preliminary separation of accompanying elements. PAAC is chosen as the complexing agent for antimony. Its selectivity and sensitivity contribute to the precision of the method. The method involves an extraction step, likely utilizing a suitable organic solvent, to selectively extract the antimony-PAAC complex from the sample matrix. The concentration of antimony in the extracted complex is determined spectrophotometrically. This involves measuring the absorbance of the complex at a specific wavelength, typically chosen based on the characteristics of the PAAC-antimony complex. The method is validated by analyzing model solutions of silicate rocks and ores. This step assesses the applicability and accuracy of the method in samples that simulate real-world conditions. The method demonstrates a reproducibility of 2-5%, indicating its reliability and precision across multiple analyses. The developed method is recommended for the analysis of chemically complex materials such as industrial wastewater, ores, concentrates, and rocks

Experimental study of the features of filtration of non-Newtonian oils in a porous medium

The current state of development of deposits with high-viscosity oils is characterized by a low value of the achieved oil recovery with a high water cut in the produced wells. However, ways to improve the implemented development systems in order to increase the recovery factor in conditions of high water cut in well production, especially in the late stage of operation requires further research. Therefore, this research intended to investigate features of filtration of non-Newtonian oils in a porous medium. Oil fields with a complex geological structure have been discovered in many oil and gas regions of the world. These fields are characterized by a small oil-saturated thickness of the reservoirs, low reservoir properties, high viscosity of reservoir oil and heterogeneity of productive horizons. To study the filtration process, a specially designed installation was used. Clearly, the main elements are a column (core holder) with a water jacket, an oil tank, a thermostat and a high-pressure air tank (compressor). A research experiment was undertaken in two oil fields, which are X and Y. The results of physicochemical properties of oil field X showed that the density was 0.878g/cm3, followed by sulfur content (1.51%), pitches (21.89), asphaltenes was 4.19, and paraffin was 5.18

History of tectonic development of the southeastern part of the Turan plate

The history of the tectonic development of the territory of the Turan Plate in the pre-Jurassic and Lower-Middle Jurassic times is considered. The development of stages of rifting on the territory of the Amudarya syneclise is analyzed. The structural elements of the rift are examined. The tectonic development of the eastern part of the Turanian plate in Neogene-Anthropocene time is analyzed in more detail. Its large structural elements are substantiated with detailed descriptions of its characteristic features