scholarly journals URANIUM AND OTHER TOXIC ELEMENTS IN TRANSBOUNDARY WATERS NEAR KAMYSHANOVSKY DEPOSIT

2020 ◽  
Vol 5 (443) ◽  
pp. 172-180
Author(s):  
Solodukhin Vladimir, ◽  
◽  
Jenbaev Bekmamat, ◽  
Lennik Svetlana, ◽  
Zholboldiev Baktyiar, ◽  
...  
Keyword(s):  
Toxic Elements ◽  
Negative Impact ◽  
Chemical Elements ◽  
Irrigation System ◽  
Irrigation Canal ◽  
Control Points ◽  
Kyrgyz Republic ◽  
River Contamination ◽  
River Bed ◽  
Water Canal

The paper is devoted to revealing the signs of negative impact from the territory of the Kamyshanovskoye deposit (Kyrgyzstan) on the level of contamination with uranium and other hazardous elements in transboundary water bodies, in the first place in the Shu River. For this, six control points along the irrigation canal at this territory were chosen together with 9 control points along the Shu river within the area. The elemental composition of water samples was studied employing MS-ICP and OES-ICP; concentration values of 22 elements were determined. The calculations were performed based on the obtained contents of toxic elements of the 1st and 2nd classes. Corresponding sanitary standards exceed the corresponding values by 1.5 – 6.7 times. At that, uranium makes the main contribution to the toxicity level of the studied water in the Shu River (46%) and in the canal (61%). The toxicity of the water canal is for ~3 times higher than that of the Shu River. The highest toxicity indicator was found in the water delivered to the agricultural irrigation at the territory of the Kamyshanovskoye deposit. This peculiarity and the obtained data may be of interest to the Ministry of Agriculture of the Kyrgyz Republic. The distribution of chemical elements in water along the irrigation canal and along the Shu River bed was studied. It is established that the canal water do not become contaminated with toxic elements while passing through the deposit lands. It was established in the 3 control points of the Shu River that an increase (by 28 – 130%) in the concentration of Ca, Ni, Li, Sr, U, Mg, Cr, Ba over their concentrations at the control points is higher upstream of this river. The results obtained convincingly indicate the presence of a serious influence of the Kamyshanovskoye deposit territory on the Shu River contamination with these elements. It is unlikely that such significant contamination is caused by the irrigation system discharge waters. One of the possible mechanisms of water contamination in the Shu River in its segment may be the entry of groundwater in contact with the ore body of this deposit.

Primary Teeth and Hair as Indicators of Environmental Pollution

2016 ◽  
Vol 40 (2) ◽  
pp. 152-155 ◽  
Author(s):  
TE Shishniashvili ◽  
NN Suladze ◽  
VV Margvelashvili
Keyword(s):  
Environmental Pollution ◽  
Toxic Elements ◽  
Chemical Elements ◽  
Epidemiological Survey ◽  
Essential Elements ◽  
World Health ◽  
Dental Tissues ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Health Organization

Objectives: To study the influence of environmental pollution on the mineralization of dental hard tissues by using biosubstrates: teeth and hair. :Study design: At the first stage epidemiological survey was conducted in polluted and less polluted areas of Tbilisi (Georgia). We studied 525 children aged 3 and 4 years. Caries prevalence and intensity was defined by the methodology of World Health Organization. At the second stage the chemical elements content was studied in hair and teeth hard tissues of 24 children by X - ray fluorescent spectroscopy method. Results: The prevalence of dental caries in the polluted region was 46%, caries intensity − 1.92 (± 2.842). In the less polluted region prevalence was 37%, caries intensity − 1.47 (± 2.571). These data are statistically reliable (p < 0.05). The study of hair and tooth tissues showed that the toxic elements (Pb, Hg, Sn, Ti) content in these tissues was higher in environmentally unfavorable than in favorable conditions. Conclusion: Hair and dental tissues can be used as indicators of environmental pollution. Our survey showed that toxic elements content in dental hard tissues was higher and the level of essential elements was less in polluted than in less polluted areas of Tbilisi.

Theoretical and practical aspects in determining the current geochemical status of the Crimean peninsula and anthropogenic risk to public health

2021 ◽  
Author(s):  
Elena Evstafeva ◽  
Svetlana Tymchenko ◽  
Anna Bogdanova ◽  
Olga Zalata ◽  
Yuliia Boyarinceva ◽  
...  
Keyword(s):  
Human Body ◽  
Negative Impact ◽  
Chemical Elements ◽  
Ecological Monitoring ◽  
Crimean Peninsula ◽  
Mercury Analysis ◽  
Geographical Regions ◽  
Wide Range ◽  
Biological Substrates ◽  
Cadmium Selenium

<p>The implementation of basic principles of medical and ecological monitoring programs in Crimea previously reported in EGU proceedings consists of determining the content of a wide range of toxic, essential and rare earth elements in various biological substrates: soil, plants, water, human body. Biosubstrates are sampled in different locations with contrast natural and anthropogenic conditions: urbanized-rural, industrial-agricultural, natural resources. Lichens and poplar leaves are used as indicators of environmental contamination, particularly atmospheric pollution; liquid precipitation is used as an indicator showing the negative impact of air pollution on ecosystems; hair is used as an indicator of the total body intake of chemical elements. The update of databases, on some of the territories (Simferopol, Sevastopol, geographical regions with different soil characteristics, etc.) with regard to some of the elements (mercury, lead, cadmium, selenium, etc.) at this stage allowed to determine their biogeochemical status in conditions of intensive growth of anthropogenic load in recent years, and to compare it with the elemental status of the humans living in this territory. The databases for other types of territories continue to be extended, the relationship between morbidity to estimate of the environmental burden of disease for environmentally determined diseases (neurodegenerative, endocrine, respiratory, etc.) and chemical load on the territories, based on USEtox model; the functional state of target systems (nervous, immune, cardiovascular) and level of chemical elements in the human body and the overall elemental imbalance, is established. This has provided us with a degree of understanding on how the degree of population and individual health risk could be determined.</p><p>Mercury analysis was funded by RFBR according to the research project № 18-29-24212\19 entitled “Development of neutralization of mercury-containing waste without heating and the formation of wastewater”, 2018–2021 years; elemental composition was possible to determine due to RFBR project № 18-45-920042\20 entitled “Bioecological monitoring of heavy metals at board of Black Sea of Crimea”, 2018–2020 years. Physiological part of research was possible to accomplish due to funds by the V.I. Vernadsky Crimean Federal University (Project No VG2019/15, АААА-А20-120012090158-7).</p>

scholarly journals Geopolitical Aspects of Channel Processes

2011 ◽  
Author(s):  
Keyword(s):  
Negative Impact ◽  
Eastern Region ◽  
Channel Processes ◽  
Republic Of China ◽  
River Bed ◽  
Boundary Position ◽  
State Boundary ◽  
Far Eastern ◽  
Water Work

When using the Far-Eastern Region as a study case the paper deals with the issues of political tensions between neighboring states (Russia and People’s Republic of China) caused by coinciding of state boundaries with rivers. Main forms of negative impact of channel processes that cause reconsideration (demarcation) of the boundary position have been described. The role of water work facilities that influence the river bed regime transformation and, consequently, fairway/state boundary position alteration is being assessed.

scholarly journals Microscopic fungi sorption of chemical elements from multicomponent solution

2019 ◽  
Vol 488 (4) ◽  
pp. 425-428
Author(s):  
L. M. Pavlova ◽  
L. P. Shumilova ◽  
V. I. Radomskaya ◽  
A. P. Sorokin ◽  
V. V. Ivanov
Keyword(s):  
Toxic Elements ◽  
Chemical Elements ◽  
Multicomponent Solution ◽  
Microscopic Fungi ◽  
Mineral Formation ◽  
Strain Specificity ◽  
Multicomponent Solutions

The data of micromycetes species and strain specificity in the process of toxic elements extracting from multicomponent solutions were obtained as results of modal experiments. The results also indicate the capability of biogenic mineral formation in organic strata.

SOIL MICROBIAL BIOMASS AND ENZYME ACTIVITIES RESPONSE TO COPPER AND MOLYBDENUM POLLUTION IN THE VICINITY OF ZANGEZUR COPPER AND MOLYBDENUM COMBINE, ARMENIA

2020 ◽  
Vol 54 (3 (253)) ◽  
pp. 235-245
Author(s):  
K.A. Ghazaryan ◽  
H.S. Movsesyan
Keyword(s):  
Microbial Biomass ◽  
Enzymatic Activity ◽  
Enzyme Activities ◽  
Soil Microbial Biomass ◽  
Negative Impact ◽  
Chemical Elements ◽  
Extracellular Enzyme ◽  
Soil Biological Activity ◽  
Soil Enzymatic Activity ◽  
Soil Microbial

The aim of this study was to define a relationship between heavy metal (Cu, Mo) pollution of soil and various extracellular enzyme activities. Six enzymatic activities involved in cycles of carbon, nitrogen, phosphorus and sulfur (β-glucosidase, chitinase, leucine-aminopeptidase, acid phosphomonoesterase, alkaline phosphomonoesterase, and arylsulphatase) as well as microbial biomass were determined in soil samples collected in the surroundings of Zangezur Copper and Molybdenum Combine. The investigations showed that pollution of soil with copper and molybdenum led to a decrease in microbial biomass and soil enzymatic activity, which in turn had a negative impact on cycles of chemical elements, in particular C, P, N and S. This gives reason to conclude that the changes in soil microbial biomass and enzymatic activity may act as indicators of soil biological activity and quality.

STALE GOLD-BEARING TAILINGS OF THE BALEIZOLOTO PLANT AND THE PROBLEM OF THEIR DISPOSAL

2021 ◽  
Vol 27 (4) ◽  
pp. 45-54
Author(s):  
G. Yurgenson ◽  
◽  
L. Shumilova ◽  
А. Khatkova ◽  
◽  
...  
Keyword(s):  
Negative Impact ◽  
Chemical Elements ◽  
Raw Materials ◽  
Precious Metals ◽  
Gold Content ◽  
Residential Areas ◽  
Extraction Technology ◽  
Useful Components ◽  
Technogenic Raw Materials ◽  
Gold Bearing

The relevance of the research is the need to recultivate the waste from the enrichment of gold-bearing ores that lie in the immediate vicinity of the residential areas of Baley city, which have a negative impact on the environmental situation in it, as well as to develop a technological approach to the extraction of gold and silver. The purpose of the study is to study the material composition and develop a technology for extracting precious metals. The object of the study is the stale tailings of the ZIF-1 plant “Baleizoloto”. The subject of the study is mineral composition of stale tailings, content of useful components and their extraction technology, the method and methodology presented by mineralogical and chemical analyses of enrichment tailings. Results. The analysis of the tailings dumps’ state of the gold recovery factories of the Baleizoloto plant was carried out. The contents of gold and other chemical elements, among which arsenic, zinc, copper, antimony, and lead predominate, were determined. The gold content prevails in the stale tailings of the ZIF-1 factory, which processed the ores of the Baley deposit, and is in the range of 1.09-1.37 g / t, on average – 1.17 g/t. This determines the prospects for their primary processing. The gold in the clay-sand fraction of the stale tailings is mainly found in thin accretions with quartz, carbonates, pyrite, arsenopyrite, sulfosols, and tellurides. The field of application is processing of technogenic raw materials. Conclusions. It was determined that the sizes of gold inclusions are in the range of 0.7-0.03 mm, the gold penetration varies from 63 to 91.15, and on average is 82.13; the main impurity in gold is silver with a content of 8.85-37%; the average silver content in the tailings of the ZIF-1 factory is 1.85 g/t; the recommended technological scheme for processing stale tailings of ZIF-1 of the Baleizoloto plant has been developed, including the following operations: photoelectron-activation preparation, pelletizing with active solution, heap leaching, two-stage sorption with bubbling with ozone

scholarly journals It’s Time to Replace the Term “Heavy Metals” with “Potentially Toxic Elements” When Reporting Environmental Research

2019 ◽  
Vol 16 (22) ◽  
pp. 4446 ◽  
Author(s):  
Olivier Pourret ◽  
Andrew Hursthouse
Keyword(s):  
Heavy Metals ◽  
Toxic Elements ◽  
Chemical Elements ◽  
Natural Sciences ◽  
Potentially Toxic Elements ◽  
Toxic Element ◽  
Environmental Research ◽  
Environmental Sciences ◽  
Common Term ◽  
Pollution Impacts

Even if the Periodic Table of Chemical Elements is relatively well defined, some controversial terms are still in use. Indeed, the term “heavy metal” is a common term used for decades in the natural sciences, and even more in environmental sciences, particularly in studies of pollution impacts. As the use of the term appears to have increased, we highlight the relevance of the use of the term “Potentially Toxic Element(s)”, which needs more explicit endorsement, and we illustrate the chemical elements that need to be considered.

scholarly journals New data about the distribution of nickel, lead and chromium in the coal seams of the DonetskMakiivka geological and industrial district of the Donbas

2020 ◽  
Vol 29 (4) ◽  
pp. 722-730
Author(s):  
Mykola A. Kozar ◽  
Valerii V. Ishkov ◽  
Yevhen S. Kozii ◽  
Pavlo S. Pashchenko
Keyword(s):  
Toxic Elements ◽  
Negative Impact ◽  
Weighted Average ◽  
Coal Industry ◽  
Potentially Toxic Elements ◽  
Ash Content ◽  
Coal Extraction ◽  
Industrial Districts ◽  
Coal Seams ◽  
Nickel Lead

A modern and scientifically based indicators forecast of toxic and potentially toxic element concentrations allows us to develop and plan organizational and technicaltechnological measures aimed at reducing the negative impact of the coal industry and heating enterprises on the ecological state of the environment. For this purpose it is necessary to have data about concentration, character and features of the distribution of toxic and potentially toxic elements, including nickel, lead and chromium in coal and the rocks that contain it. Toxic elements are one of the main sources of environmental pollution thatnegatively affects human health. Research in this direction is conducted to reduce the degree of negative effects and additional pollution of the environment. Increasing requirements for environmental protection in the coal-mining industry sector of Ukraine stipulates the need for new scientifically grounded methods for forecasting the content of toxic and potentially toxic elements in the rock mass which is extracted by mines, the waste of coal extraction and coal enrichment and also the influence of the coal-heating enterprises on the environment. In the article, the results of investigations of toxic elements in coal seams of the Donetsk-Makiivka geological and industrial area of the Donbas are considered. The research covered the whole territory of one of the most studied geological and industrial districts of the Donbas – Donetsk-Makiivka. As a result of the study, correlation coefficients were calculated that allow us to predict the concentration of nickel, lead and chromium in the products and wastes of coal enrichment and correct the technological schemes of coal enrichment taking into account their content. We also calculated the regression equation between these elements and the ash content of the coal, which will allow us to predict their concentration in the main working coal seams of the DonetskMakiivka geological and industrial districts relative to the values of coal ash content. The character of the distribution is established and the weighted average concentrations and basic descriptive statistics for nickel, lead, and chromium in the coal seams and suites are calculated. The composition and character of their typomorphic geochemical associations, as well as the features and regularities of their accumulation in the coal seams of the Donetsk-Makiivka geological and industrial districts are revealed.

scholarly journals ASSESSMENT OF THE HEAVY METAL DISTRIBUTION IN SOILS WITHIN THE AREASFOR THE MUNICIPAL SOLID WASTE DISPOSAL

2019 ◽  
pp. 76-80 ◽  
Author(s):  
O. Azimov ◽  
I. Kuraeva ◽  
V. Bakhmutov ◽  
Yu. Voytyuk ◽  
S. Karmazynenko
Keyword(s):  
Heavy Metal ◽  
Surface Water ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Heavy Metal Contamination ◽  
Negative Impact ◽  
Chemical Elements ◽  
Soil Layer ◽  
Practical Significance ◽  
Solid Waste Disposal

The aim of the study was to identify the ecological negative impact of municipal solid waste Landfill № 5 located near the city of Kyiv on the environment. The complex geoecological studies are carried out within the area. They included the field works with the sampling of different elements of landscape (soil, surface water, vegetation) and the further laboratory and geochemical analyses. The acute pollution with copper-zinc of soils has been detected. Moreover, in vicinity of the north-eastern contour of Landfill area the anomalies for Cu content (10000 mg/kg that is in 300 times higher than the maximum allowable concentrations – MAC), Zn content (5000 mg/kg that is in 90 times higher than the MAC), Pb content (1000 mg/kg that is in 30 times higher than the MAC) are revealed in the samples taken from the surface soil layer of 0–5 cm. These soil samples are characterized by maximal specific magnetic susceptibility (572.1 SІ´10-8 m3/kg). The heavy-metal contamination of soil has shown that their mobility increased tenfold in comparison with the background sites. The elements of significant accumulation in the grass vegetation are Cu and Cr at the biological absorption coefficients of 1.25 and 1.0, respectively. The contents of analyzed chemical elements and compounds in the surface water samples taken from the background sites don't exceed the MAC. The indicated results characterize the scientific novelty of the studies. Their practical significance is the making management decisions by the administrative authorities with regard to the further waste facilities maintenance.

scholarly journals Influence of the Indicators of Carbohydrate Metabolism on the Elemental Status

2021 ◽  
Author(s):  
Olga Marshinskaia ◽  
Tatiana Kazakova ◽  
Svetlana Notova ◽  
Maksim Molchanov
Keyword(s):  
Diabetes Mellitus ◽  
Trace Elements ◽  
Toxic Elements ◽  
Normal Values ◽  
Chemical Elements ◽  
Serum Parameters ◽  
Glucose Levels ◽  
Icp Ms ◽  
Elemental Status ◽  
Elevated Glucose

This study examined the elemental status of the hair and blood biochemistry of young men in the Orenburg region (n=38) with different glucose levels. Estimation of the element status was carried out through the study of the chemical composition of the hair by ICP-AES and ICP-MS. It was found that the studied serum parameters (Ca, Mg, Fe, P cholesterol, thyroxine, TSH and testosterone) were within normal values, and no statistically significant differences were obtained when comparing the groups. The concentration of chemical elements in the hair of the men in each group was in the range of physiologically acceptable values for this region. In the group with elevated glucose levels, there was a tendency for the men to have lower values of Ca and Mg, and higher levels of K, Na, P and a number of toxic elements (Al, Cd, Sn, Hg, Pb). Keywords: elemental status, trace elements, diabetes mellitus, metabolism

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