Chemical Destruction Research Articles

Regional Characteristics of Atmospheric Sulfate Formation in East Antarctica Imprinted on 17O‐Excess Signature

Abstract17O‐excess (Δ17O = δ17O − 0.52 × δ18O) of sulfate trapped in Antarctic ice cores has been proposed as a potential tool for assessing past oxidant chemistry, while insufficient understanding of atmospheric sulfate formation around Antarctica hampers its interpretation. To probe influences of regional specific chemistry, we compared year‐round observations of Δ17O of non‐sea‐salt sulfate in aerosols (Δ17O(SO42−)nss) at Dome C and Dumont d'Urville, inland and coastal sites in East Antarctica, throughout the year 2011. Although Δ17O(SO42−)nss at both sites showed consistent seasonality with summer minima (∼1.0‰) and winter maxima (∼2.5‰) owing to sunlight‐driven changes in the relative importance of O3 oxidation to OH and H2O2 oxidation, significant intersite differences were observed in austral spring–summer and autumn. The cooccurrence of higher Δ17O(SO42−)nss at inland (2.0‰ ± 0.1‰) than the coastal site (1.2‰ ± 0.1‰) and chemical destruction of methanesulfonate (MS–) in aerosols at inland during spring–summer (October–December), combined with the first estimated Δ17O(MS–) of ∼16‰, implies that MS– destruction produces sulfate with high Δ17O(SO42−)nss of ∼12‰. If contributing to the known postdepositional decrease of MS– in snow, this process should also cause a significant postdepositional increase in Δ17O(SO42−)nss over 1‰, that can reconcile the discrepancy between Δ17O(SO42−)nss in the atmosphere and ice. The higher Δ17O(SO42−)nss at the coastal site than inland during autumn (March–May) may be associated with oxidation process involving reactive bromine and/or sea‐salt particles around the coastal region.

The Durability of Large-Block Hollow Ceramics

Increased requirements for heat insulation of building enclosure contribute to widening of modern effective building materials. One of those items is large-block hollow ceramics. Large-block hollow ceramics is actively used for building enclosure because of high properties and increasing production. However, it’s usage in outer walls and material’s humidification significantly decreases the durability of ceramic blocks. This article is about durability of large-block hollow ceramics. The main scientific hypothesis is that the web’s material of the block has increased chemical destruction speed compared to shell’s material. Also, article include the results of laboratory experiments of material’s destruction based on the process of material’s chemical corrosion that were conducted by developed methods of determination the corrosive activity of moisture and material’s chemical durability. Based on the results of pilot researches at one of Russian factories, the method of large-block ceramic material’s research was developed. The first stage results of research are shown. The results of research confirms the decrease of web’s material strength compared to strength of shell’s material.

Патогенетические аспекты терапии воспалительных заболеваний урогенитального тракта у женщин репродуктивного возраста

This paper discusses one of the important gynecological issues, inflammatory diseases of the urogenital tract caused by opportunistic microbes. The treatment and long-term control over these conditions are challenging and depend on their occurrence and high risk of complications. Impaired local anti-infectious protection is one of the risk factors of chronic inflammation. Since the disease may recur even after successful treatment, domestic and foreign authors increasingly focus on immunotherapy as a part of complex strategy and isolated entity. Local immunotherapy may prevent recurrences and activate host defense. This paper describes the management of two women with mixed infections. The first woman with chronic recurrent inflammation (cervicitis caused by U. urealyticum, vulvovaginal candidiasis, and aerobic vaginitis) in whom prior etiological therapy was ineffective received immunotherapy which resulted in long-term remission. The second woman with coexistent papillomavirus infection (genital warts) and bacterial vaginosis received immunotherapy and topical etiological treatment. As a result, clinical symptoms, the size and number of genital warts reduced which greatly facilitated their chemical destruction. KEYWORDS: genital tract, urogenital infections, papillomavirus infection, bacterial vaginosis, local immunity, biofilms. FOR CITATION: Letyaeva O.I., Ziganshin O.R. Pathogenic treatment of the inflammatory diseases of the urogenital tract in women of reproductive age. Russian Journal of Woman and Child Health. 2021;4(1):59–64. DOI: 10.32364/2618-8430-2021-4-1-59-64.

ПРОЦЕССЫ ХИМИЧЕСКОЙ КОРРОЗИИ, ПРОТЕКАЮЩИЕ В МАТЕРИАЛЕ КРУПНОБЛОЧНОЙ ПОРИСТОЙ КЕРАМИКЕ

Large-block porous ceramics, which enter the market of building materials, have a number of undeniable qualities: low thermal conductivity, low density, high aesthetic qualities. According to its design features, this material is a modern prototype of hollow bricks used in construction since the nineteenth century. Field studies of the work of enclosing structures using hollow bricks have shown that in many cases, the bricks laid in the enclosing structures of buildings 60-80 years ago were significantly destroyed. In this case, the destruction mechanism does not depend on the polythermal load on the material. The hypothesis that the destruction is associated with the chemical destruction of the material was investigated using the developed method for determining the chemical resistance of the material of wall ceramics. The conducted studies confirmed the hypothesis. Studies of the chemical resistance of the material of large-block porous ceramics should be taken into account in the production technology of ceramics.

Ozone deposition to a coastal sea: comparison of eddy covariance observations with reactive air–sea exchange models

Abstract. A fast-response (10 Hz) chemiluminescence detector for ozone (O3) was used to determine O3 fluxes using the eddy covariance technique at the Penlee Point Atmospheric Observatory (PPAO) on the south coast of the UK during April and May 2018. The median O3 flux was −0.132 mg m−2 h−1 (0.018 ppbv m s−1), corresponding to a deposition velocity of 0.037 cm s−1 (interquartile range 0.017–0.065 cm s−1) – similar to the higher values previously reported for open-ocean flux measurements but not as high as some other coastal results. We demonstrate that a typical single flux observation was above the 2σ limit of detection but had considerable uncertainty. The median 2σ uncertainty of deposition velocity was 0.031 cm s−1 for each 20 min period, which reduces with the square root of the sample size. Eddy covariance footprint analysis of the site indicates that the flux footprint was predominantly over water (> 96 %), varying with atmospheric stability and, to a lesser extent, with the tide. At very low wind speeds when the atmosphere was typically unstable, the observed ozone deposition velocity was elevated, most likely because the footprint contracted to include a greater land contribution in these conditions. At moderate to high wind speeds when atmospheric stability was near-neutral, the ozone deposition velocity increased with wind speed and showed a linear dependence with friction velocity. This observed dependence on friction velocity (and therefore also wind speed) is consistent with the predictions from the one-layer model of Fairall et al. (2007), which parameterises the oceanic deposition of ozone from the fundamental conservation equation, accounting for both ocean turbulence and near-surface chemical destruction, while assuming that chemical O3 destruction by iodide is distributed over depth. In contrast to our observations, the deposition velocity predicted by the recently developed two-layer model of Luhar et al. (2018) (which considers iodide reactivity in both layers but with molecular diffusivity dominating over turbulent diffusivity in the first layer) shows no major dependence of deposition velocity on wind speed and underestimates the measured deposition velocities. These results call for further investigation into the mechanisms and control of oceanic O3 deposition.

TAFONOMÍA DE LOS CARBONATOS TEMPLADOS PLIOCENOS DE LA CUENCA DE ALMAYATE (MÁLAGA, S DE ESPAÑA)

Se analizan los procesos tafonómicos que afectan a las asociaciones de fósiles de los carbonatos templados del Plioceno que afloran en la Cuenca de Almayate (Málaga, S de España). El estudio tafonómico se ha realizado cuantificando varias propiedades tafonómicas. Los valores obtenidos han servido para realizar un análisis multivariante de agrupamiento de muestras, con objeto de establecer modelos de tafofacies. Los resultados obtenidos indican unas condiciones de depósito de alta energía donde los restos esqueléticos permanecieron durante prolongados períodos de tiempo en la zona tafonómicamente activa. En este contexto, durante los periodos de sedimentación normal se produjo un efecto combinado de destrucción tafonómica: 1) destrucción física, como consecuencia de la alta energía, 2) destrucción biológica, debido al efecto de los organismos bioperforadores, y 3) destrucción química, por disolución de las fases inestables del carbonato cálcico. Estos procesos tafonómicos son los que de forma habitual afectan a los carbonatos templados. Además de estos procesos normales, la acción esporádica de tormentas dejó señales sedimentológicas (presencia de niveles de tempestitas) y tafonómicas propias. En este sentido, el análisis cluster individualiza un conjunto de muestras tomadas en niveles de tempestitas. Finalmente, el análisis cluster separa un tercer grupo de muestras donde domina la presencia de moldes de organismos originalmente aragoníticos sobre restos que mantienen la mineralogía original de la concha. Una cementación temprana debió jugar un papel decisivo en la formación de esta asociación.

Modular Hydrogen Peroxide Electrosynthesis Cell with Anthraquinone-Modified Polyaniline Electrocatalyst

Advanced oxidation processes (AOPs) target the chemical destruction of a wide range of nonbiodegradable, toxic, and recalcitrant organic pollutants instead of removal via physical separation, which produces contaminant-laden concentrates or solids. Hydrogen peroxide (H2O2) is the most widely used precursor that produces a highly reactive and nonselective hydroxyl radical at the site of an AOP through activation by UV irradiation. The potential for AOPs to meet the growing demand of transforming a centralized treatment and distribution practice into a modular, small-scale, and decentralized treatment paradigm can be maximized by innovative technologies that can synthesize precursor chemicals also at the site of water treatment, eliminating the need for a continuous chemical supply. We here present an electrochemical H2O2 generation cell that produces a large quantity of H2O2 while consuming only 0.2 to 20% of the total electricity consumption of AOPs in various AOP application scenarios employing UV activation. We achieve high electrochemical H2O2 production efficiency by synthesizing an anthraquinone-modified polyaniline composite that enables an efficient two-electron oxygen reduction reaction. Polyaniline functions as a conductive support with abundant attachment sites, and anthraquinone ensures selective H2O2 generation. In a flow cell equipped with a gas diffusion cathode, H2O2 can be produced at a rate of 1.80 mol gcatalyst–1 hr–1 at 100 mA with a Faradaic efficiency of 95.83%. Finally, we examined the H2O2 production capability of the device with simulated drinking water and wastewater as feed electrolytes to demonstrate its potential for real-world operation scenarios.

Composition of High-Molecular-Weight Heteroatomic Components of Oil Shale Organic Matter

The composition of sulfur-bound compounds of asphaltic–resinous substances of bitumen from oil shale sampled from the Dmitrievskoe deposit (Kuzbass) has been studied using the technique of selective chemical destruction. It has been shown that the structure of asphaltenes and resins contains moieties represented by alkanes, phenylalkanes, phenanthrenes, fluoranthenes, pyrenes, and methyl esters of aliphatic acids that are linked to each other or to the polycondensed core of their molecules through alkyl sulfide bridges. A distinctive feature of asphaltene molecules is the presence of S-bound phenyl- and naphthene-substituted aromatic hydrocarbons and aromatic oxygen-containing compounds in their composition.

Prospects of the nasal spray in first aid tools for acute poisoning

The purpose of this review is to substantiate approaches for improving first aid in acute poisoning. Early administration of medical agents to the victims is advisable, but in injectable dosage form is problematic. An alternative is a nasal spray – dosage form that is suitable for systemic administration of pharmaceutical substances with small molecular weight (up to 1000 Da) and moderate hydrophilicity (log Poctanol/water ≥ 0), and a single dose of which can be contained in volume of up to 0, 3 ml. These criteria are met by the number of pharmaceutical substances used for the treatment of acute poisoning with substances that can form foci of mass destruction. This defines the perspective of nasal sprays as a medical device that allows to speed up, simplify and make it safer to use drugs when providing first aid in the centers of mass chemical destruction.

Mixed-matrix membrane reactors for the destruction of toxic chemicals

The extremely toxic synthetic organophosphates used as pesticides and chemical warfare agents (CWA) are capable of not only directly disrupting biological functions but also causing secondary contamination of water and soil. Among the proposed detoxifying materials, zirconium-based metal-organic frameworks (MOFs) have emerged as promising catalysts for CWA degradation. However, the practical application of MOFs is limited by their intractable powdery form, and requires complex instrumental settings. To address this issue, mixed-matrix membrane reactors (MMR) are developed based on Zr-based MOFs embedded in the porous polymer matrix. Such configurations also enable CWAs flowing through the nanochannels of MMR to easily access the catalysts, which is beneficial for enhancing the CWA degradation. A series of flat MMRs and hollow fiber MMRs containing UiO-66, UiO-66-NH2, and MOF-808 were evaluated. MMRs containing MOF-808 provided an extremely high conversion of 95% despite short residence times (<10 s) under continuous operation reflecting their promise for practical applications.

Brickwork Chemical Corrosion Features

The use of multilayer enclosing structures in modern construction poses a new task of studying the mutual influence of all materials of multilayer structures on the durability of the structure as a whole. Masonry is the oldest and most representative multi-component envelopes. This work is devoted to the study of the processes of chemical destruction, taking into account the mutual influence of building ceramics (clay bricks) and cement-sand mortar. The article deals with the main process of destruction of materials, based on the destruction of the amorphous part of the brick under the influence of calcium hydroxide, penetrating into the brick of cement-sand mortar, where it is produced in the process of dehydration of calcium silicates and aluminosilicates (leaching reaction). We consider the side processes of the first type, taking into account the presence in the amorphous phase of brick oxides of alkali and alkali-earth metals.

Оптимизация состава медноаммиачного травильного раствора в производстве печатных плат

Etching in the production of printed circuit boards is the process of chemical destruction of metal (mainly copper) as a result of the action of liquid or gaseous etchers on the areas of the surface of the workpiece unprotected by a protective mask (etching resist). Copper foil etching is used to form a conductive pattern of PCB by removing copper from unprotected etching resist areas. This is one of the main operations of manufacturing the PCB, since a pattern of printed elements is formed on it. During the etching process, unprotected copper from the printed circuit board by means of an oxidizer is converted into an ionic state and is connected to hydroxide and ammonium chloride, forming a solution of the copper-ammonia complex, which after oxidation with air ensures dissolution of copper. The etching solution in question contains three components: copper(II) chloride, which when reacted with metallic copper is an oxidant; Ammonia forming ammonia complexes with copper(II) and allowing copper(II) to be kept in a soluble state; Ammonium chloride, which accelerates the etching process and keeps the solution stable. Increased efficiency of copper etching in ammonia solutions is achieved at change of its composition. The purpose of the work was to study the etching rate of copper and to change the concentration of the etching solution depending on the initial concentration of copper(II) chloride in the original etching solution, as well as the effect of the pH of the etching solution on the etching rate of metallic copper. The double-sided foamed fiberglass was used as a starting material to study the etching process. The foil thickness was 30 μm. Etching of the copper foil was carried out with constant stirring of the sample in solution. The concentration of copper ions in the solution was determined by spectrophotometric method from the value of optical density of the ammonia-containing solution (D). The thickness of the release layer of metallic copper was determined by gravimetric method. As a result of this work, it has been shown that changes in the concentration of copper(II) in the solution, the etching rate, the thickness of the release coating and the pH of the solution can be used to characterize the copper etching process. It is established that the greatest increase in concentration of Cu2+ in solution is observed within the first minute with its further gradual slow increase. More obvious increase in concentration of Cu2+ in solution is observed at concentration of Cu2+ in initial solution 80 gl−1. At increase in concentration of chloride of copper(II) in solution from 40 gl−1 to values 100 gl−1 sharp increase in speed of etching of copper is observed. A further increase in copper(II) chloride concentration results in a decrease in etching rate. The pH of the etching solution is determined by the ratio of ammonia and ammonium chloride. This is due to the formation of a buffer mixture in the solution. Increasing the pH of the solution results in an increase in the etching rate followed by a decrease in the etching rate.

Production of Lithium Hydroxide and Lithium Carbonate from Spent Lithium Batteries

A disposal technology for lithium batteries with minimal environmental impact is proposed. Ground battery components are processed in five stages, to produce mechanically activated powder. Attention focuses on two stages: leaching; and purification and concentration of the lithium hydroxide and carbonate in a high-pressure membrane unit. Theoretical principles are outlined for mechanical–chemical destruction of the ground battery components with high product yield. Analysis of ball and product motion in a ball mill shows that waterfall motion of the balls is optimal. Formulas are given for the equivalent diameter of the particles and their specific surface.

АНАЛИЗ ДОЛГОВЕЧНОСТИ ИНЖЕНЕРНЫХ БАРЬЕРОВ БЕЗОПАСНОСТИ ИЗ БЕТОННЫХ ГЛИН

The durability and safety of the storage and burial sites of hazardous waste from metallurgical and chemical production should be ensured through the consistent implementation of the defense in depth concept. Engineering designs of safety barriers should meet the following requirements: limit contact of waste with natural waters; ensure the safety of waste under external influences; prevent the spread of hazardous industrial waste to the surrounding soil mass. Object safety indicators are durability and service life, which should be ta ken into account in scenarios of forecasting the durability of disposal systems.For an objective assessment of the degradation of engineering safety barrier s of radioactive waste disposal sites, evolution models of bentonite barriers are considered. The following models are considered: montmorillonite illitization model; bentonite chlorination model; model for calculating the swelling parameters; ion exchange model and a model of sorption of radionuclides by bentonite. Conclusions show that when assessing the long-term evolution of engineering safety barriers from bentonite during the chemical destruction of montmorillonite, changes can occur, in particular, an increase in the permeability of the barrier.

Особенности течения и терапии клинических форм папилломавирусной инфекции у беременных

The article contains some data from modern literature on the problems of the course and tactics of managing of manifested forms of human papillomavirus infection (HPI) in pregnant women. The following variants of clinical forms of HPI, such as intraepithelial neoplasia, genital warts, and respiratory papillomatosis in children are analyzed. The authors also characterized permissible during pregnancy methods of treatment, including diathermocoagulation, surgical excision, radio wave destruction, photodynamic therapy, chemical destruction, as well as the possibility of immunotherapy. The necessity of correcting immunological disorders, treatment of concomitant infections of the urogenital tract and the importance of examination of a sexual partner are emphasized.

Non-destructive DNA extraction from herbarium specimens: a method particularly suitable for plants with small and fragile leaves.

Protocols for DNA extraction from plants generally involve physical and chemical destruction of tissues. Use of these conventional methods precludes preservation of morphological information from herbarium specimens, especially for small plants with few leaves, and reduces the voucher value of specimens. Here, we developed a new, non-destructive DNA extraction protocol (Protocol 1) that only needs a small piece of leaf (< 25mm2) to obtain DNA suitable for DNA sequencing from fragile herbarium specimens. The protocol was very simple and rapid; an extraction buffer was placed on the leaf surface of an intact specimen for 30min at room temperature (20°C). The quality of extracted DNA was checked by PCR amplification of two standard plant DNA barcode regions, the maturase K gene (matK, ca. 850 bp) and the ribulose-1,5-bisphosphatecarboxylase/oxygenase gene (rbcL, ca. 550 bp), for 14 vascular plant species encompassing various taxonomic groups. The protocol retrieved sequences from 80.0% of specimens for matK and 46.2% of specimens for rbcL. Placing of the extraction buffer onto specimens did not cause any tears or deformation, but caused discoloration in some plants. To improve DNA yield for specimens incompatible with Protocol 1, we developed an alternative protocol for DNA extraction with minimally invasive destruction of specimens (Protocol 2). In this protocol, a cut leaf was immersed in the extraction buffer for 30min and stored subsequently in a fragment pocket on the specimen sheet. This alternative method retrieved matK sequences from 80.0% of specimens and rbcL sequences from 92.8% of specimens. The combination of Protocols 1 and 2 enabled us to obtain matK sequences from 90.0% of specimens and rbcL sequences form 92.8% of specimens. The new protocols facilitate the use of museum specimens for use of DNA of museum specimens while still preserving morphological information.

СОСТАВ И СТРУКТУРА СМОЛИСТЫХ КОМПОНЕНТОВ ЛЕГКОЙ И ТЯЖЕЛЫХ НЕФТЕЙ

Актуальность работы обусловлена отсутствием сравнительной характеристики состава и строения смол нефтей различной химической природы, так как особенности структуры смолистых компонентов оказывают существенное влияние на глубину их превращения в легкие углеводороды для производства светлых нефтепродуктов. Особое значение работы в этом направлении получили в последнее время из-за неуклонного роста в составе разведанных и извлекаемых запасов тяжелых высоковязких нефтей, которые отличаются от традиционных нефтей высоким содержанием высокомолекулярных гетероатомных соединений. Цель: сравнительное изучение состава, структуры и особенностей строения основных структурных блоков молекул и химического состава азоторганических оснований смолистых компонентов легкой и тяжелых нефтей. Методы: селективная химическая деструкция сульфидных и эфирных связей, элементный и структурно-групповой анализы, жидкостно-адсорбционная хроматография, криоскопия в бензоле, ЯМР 1Н-спектроскопия, хроматомасс-спектрометрия. Результаты. Проведен сравнительный анализ состава и структуры смолистых компонентов легкой и тяжелых нефтей. Определены сходства и различия их структурно-группового состава, строения азотистых соединений основного характера и структурных блоков, связанных в молекулах смол C-O и C-S связями. Установлено, что смолистые компоненты тяжелых нефтей отличаются большими общими размерами средних молекул за счет числа связанных воедино структурных единиц (1,79–1,86 против 1,25), имеющих более крупные средние размеры полиареновых ядер (число ароматических циклов 2,36–2,43 против 1,57); большее число алициклических фрагментов, сконденсированных с ароматическим ядром молекул (количество атомов С, находящихся в α-положении к ароматическим циклам 4,56–4,75 против 3,42), и большую распространенность длинных алкильных заместителей (2,42–2,59 против 1,97). К наиболее распространенным «связанным» фрагментам макромолекул исследуемых смол относятся н-алканы, циклогексаны, прегнаны, холестаны, хейлантаны и гопаны. Особенностью молекул смол тяжелых нефтей является присутствие в составе их «эфиросвязанных» фрагментов полициклических ароматических углеводородов и гетероорганических соединений, а особенностью смол легкой нефти – присутствие в составе «серосвязанных» фрагментов полициклоалканов, этиловых эфиров н-алкановых кислот, алифатических спиртов и бициклических сульфидов. Смолы тяжелых нефтей характеризуются более высоким суммарным выходом азоторганических оснований (38,4–40,8 против 26,0 %), в составе которых доминируют соединения, осаждаемые в виде нерастворимых хлористоводородных солей (36,5–37,6 против 10,9 %).

ЭКОТОКСИКОЛОГИЧЕСКИЙ МОНИТОРИНГ СОДЕРЖАНИЯ ОСТАТКОВ ИНСЕКТИЦИДОВ В ПЛОДАХ ГРУШИ

Experimental data from two years of research showed the perspective of using insecticides based on acetamiprid, thiacloprid, and aversectin C against pear psylla in the conditions of the Nonchernozem zone. The period of semi-decomposition (T 50 , days) of acetamiprid ranged from 7 to 22 days, tiakloprid from 8 to 21 days, aversectin C from 2-3 days, depending on air temperature, amount of precipitation and dose of the drug. The decrease in the active substance of insecticides from the fruit of pear occurred as a result of chemical destruction and biological destruction (dilution). The rate of decomposition of aversectin C in pear fruits was maximum and was equal to 0,4894 ± 0,0413 days -1 , compared with acetamipride 0,1042 ± 0,0230 days -1 and thiacloprid 0,0392 ± 0,0021 days -1 . The use of the studied drugs is hygienically safe. The waiting time of insecticides from the group of neonicotinoids and the natural complex of avermectins in the pear was: acetamiprid up to 3 (7) days., thiacloprid — 1-3 days, aversectin C 2-4 days.

Formation of COMs in Explosions—and Their Destruction

The method(s) by which complex organic molecules are formed is a subject of much debate. Specifically, if it is assumed that they are formed through gas–grain interactions, then it is necessary to identify a mechanism that is both efficient at forming the molecules and return them to the gas phase in quiescent clouds. In this paper, we review the recent models that are based on the catastrophic recombination of radicals, stored in ice, that leads to an explosion of the ice mantles and a vigorous high density radical–radical association chemistry. We identify the strengths and weaknesses of the models in recent applications. Finally, we address the often overlooked issue of complex organic molecule (COM) destruction channels and argue that our poor knowledge of the chemical destruction mechanisms is undermining the diagnostic power of COM studies.

Results of application of chemical destruction in complex treatment of focal hepatic pathology

Objective. To estimate the immediate results of application of chemical destruction with 10% solution of calcium chloride in complex of treatment in the patients, suffering focal hepatic pathology.&#x0D; Маterials and methods. In 2012 - 2019 yrs, using chemical destruction, the impact was delivered towards 104 tumoral foci (range from 1 tо 4) in the patients, suffering hepatocellular carcinoma (23.7%), colorectal cancer metastases (55.3%) and in noncolorectal cancer (21.1%). The foci diameter have constituted at average (2.60 ± 1.24) сm (in 1.0 - 4.0 сm range). Chemical ablation was performed, using injections of 10% solution of calcium chloride. Side-effects and answer of tumoral foci were estimated.&#x0D; Results. The specific postoperative complications rate (formation of abscesses in zone of destruction, development of hematomas and biliomas) have constituted 10.5%. There were observed a complete answer in the foci 1.0 - 1.5 сm in diameter, while the disease progress - concerning the foci 3,8 - 4,2 сm in diameter. Local recurrence have occurred in 15.8% patients. The answer degree trustworthily depended upon the tumoral foci density (r=0.529, р &lt; 0.001). Including, complete answering was observed in 76.9% hypodense, 23.1% іsodense foci, and partial - concerning 37.8% hypodense, 29.7% іsodense and 32.4% of the foci of mixed structure. Stabilization of the disease was diagnosed, concerning 15.0% іso- and hypodense, 40.0% hyperdense and 45.0% with the foci of mixed structure, while a progress - concerning 85.7% hyperdense and 14.3%of the foci of mixed density.&#x0D; Conclusion. Іntratumoral injection of 10% solution of calcium chloride in the treatment of focal hepatic pathology is not accompanied by severe specific complications and mortality, the patients are survive the procedure satisfactory, which may be applied as a local tumoral control of tumoral foci up to 3.0 сm in diameter.