scholarly journals Anthropogenic and natural factors controlling the composition of bottom sediments of the Vaskovskoe Lake, Eastern Sihote-Alin, Primorye

2021 ◽  
pp. 65-73
Author(s):  
В.М. Шулькин
Keyword(s):  
Bottom Sediments ◽  
Mining Industry ◽  
Size Composition ◽  
Heavy Metal Concentration ◽  
Climatic Conditions ◽  
Pollution Levels ◽  
Natural Factors ◽  
Fold Reduction ◽  
Rate Of Sedimentation ◽  
The Vertical Distribution

Изучено вертикальное распределение Pb, Cd, Zn, Hg, Cu, Ni, Fe, Mn, Cорг, а также скорость осадконакопления, определенная по снижению 210Pb, в верхнем 50-сантиметровом слое донных отложений оз. Васьковского, расположенного на восточном макросклоне хр. Сихотэ-Алинь и находящегося под влиянием аэральных выбросов горно-рудных предприятий долины р. Рудная. Установлена скорость осадконакопления в центральной части озера 2.7±0.26 мм/год, что позволяет оценить изменение химического состава донных отложений за последние 160–180 лет. Верхний 8-сантиметровый слой, накопленный после 1983 г., обогащен Pb, Cd в 4.8–8.1 раза, а Zn, Cu, Mn и Hg – в 1.8–2.5 раза по сравнению с нижележащими отложениями, накопленными до 1960 г. В сочетании с данными по динамике добычи и переработки полиметаллических руд в долине р. Рудная это указывает на аэральное поступление техногенного газопылевого материала как на главный источник загрязнения верхнего слоя озерных донных отложений. Обнаружено, что даже при значительном, 2-кратном снижении объемов производства и выбросов в 90-х годах ХХ в., уровень загрязнения осадочного материала, накапливающегося в донных отложениях, остается высоким, и требуется дальнейший мониторинг для характеристики способности геосистем нижней части долины р. Рудная к самоочищению. Показано, что нормирование концентрации тяжелых металлов относительно Fe, учитывающее вариации гранулометрического состава и содержания гидроксидов Fe, позволяет отследить не только интенсификацию горнорудного производства в 70–80-х годах ХХ в., но и начало хозяйственной деятельности в конце ХIХ в. Установлено, что в отличие от тяжелых металлов, концентрация органического вещества (Сорг) в верхнем слое отложений отражает изменение природно-климатических условий на водосборе, соотношение автохтонных и аллохтонных источников Сорг и изменения трофического статуса водоема. The vertical distribution of Pb, Cd, Zn, Hg, Cu, Ni, Fe, Mn, Corg and the rate of sedimentation by 210Pb in the upper 50 cm layer of bottom sediments of the Vaskovskoe Lake has been studied. Vaskovskoe Lake is located on the eastern slope of Sihote-Alin range. It existed under the influence of the mining industry at the Rudnaya River Valley. The rate of sedimentation in the central part of the lake is set at 2.7±0.26 mm/year, which allows estimating the change in the chemical composition of bottom sediments over the last 160-180 years. The top 8 cm layer, accumulated after 1983, is enriched by Pb, Cd in 4.8-8.1 times, In the combination with data on the production and processing of polymetallic ores, it indicates the atmospheric deposition of technogenic dust material as the main source of pollution of the lake sediments. It has been found that even with a significant two-fold reduction in production and emissions in the 1990s, pollution levels of sediments remain high, and further monitoring is required to characterize the geosystem’s ability to self-purification. It is shown that the heavy metal concentration normalized by Fe, taking into account variations in the gran size composition and content of Fe hydroxides, allows us to track not only the intense mining production in the 70s and 80s of the twentieth century, but also the early beginning of economic activity at the Rudnaya R. valley at the end of the nineteenth century. It has been revealed that unlike heavy metals the concentration of organic matter (Corg) in the bottom sediments reflects the change in natural and climatic conditions at the catchment, the ratio of autochtonuos and allochtonuos sources of Corg and changes in the trophic status of the lake.

INFLUENCE OF THE ECOLOGICAL STATE OF THE SEREPOK RIVER (VIETNAM) ON ACCUMULATION OF HEAVY METALS IN ORGANS OF FISH

2017 ◽  
pp. 98-105
Author(s):  
Ngo The Cuong ◽  
Tran Hoan Quoc ◽  
Svetlana Vasilievna Zolotokopova
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
River Water ◽  
Bottom Sediments ◽  
Heavy Metal Concentration ◽  
Industrial Areas ◽  
Industrial Regions ◽  
Cadmium Lead ◽  
Sarotherodon Galilaeus ◽  
Water Bottom

The article focuses on the study of change of containing heavy metals (zinc, copper, iron, cadmium, lead, arsenic) in the abiotic and biotic components of the Serepok river (Vietman) influenced by wastewater discharge from industrial areas. Heavy metal content was determined in the river water and bottom sediments in the four zones: above and within the boundaries of industrial regions Xoa Phu and Tam Thang and in two water reservoirs situated below the boundaries of those industrial areas. Tilapia Galilean ( Sarotherodon galilaeus ), Hemibagrus ( Hemibagrus ), and sazan ( Cyprinus carpio ) caught in these areas were the hydrobionts under study in which liver, gills, skeleton and muscles accumulation of heavy metals was detected. In the organs of fish caught in the river within industrial region, heavy metals concentration was 3-7 times higher. The greatest concentration of heavy metals was found in the liver and gills of fish caught in the boundaries of industrial regions, the least concentration was in the muscles. In most cases, significant correlation between heavy metal concentration in organs of fishes and in river water, bottom sediments has been revealed.

ANALYSIS OF THE MODERN GRAIN-SIZE COMPOSITION VARIABILITY OF THE ANAPA BAY-BAR BEACH SEDIMENTS

2018 ◽  
Author(s):  
В. Крыленко ◽  
V. Krylenko ◽  
Р. Косьян ◽  
R. Kos'yan ◽  
М. Крыленко ◽  
...  
Keyword(s):  
Grain Size ◽  
Bottom Sediments ◽  
Size Structure ◽  
Size Composition ◽  
Potential Danger ◽  
Grain Size Composition ◽  
Beach Sediments ◽  
Sediment Particles ◽  
Sand Material

The results of realized in 2010 field researches of the spatial and time grain-size structure variability of beach and bottom sediments of the bay-bar Anapskaya southern part are presented in this paper. Irretrievable carrying out of sediment particles to depths more than 7 m intensifies with their size decrease to 0,1 mm. As over 70 % bottom and about 60 % beach sediments are presented by fractions less 0,16 mm on bay-bar Anapskaya southern part, namely at this part there is sand material massive carrying out to depth. Potential danger of the investigated site geosystem degradation is revealed.

scholarly journals Cloud scavenging of abundant anthropogenic refractory particles at a mountain site in North China

2018 ◽  
Author(s):  
Lei Liu ◽  
Jian Zhang ◽  
Liang Xu ◽  
Qi Yuan ◽  
Dao Huang ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
Size Composition ◽  
Climate Forcing ◽  
Pollution Levels ◽  
Aerosol Cloud ◽  
The North ◽  
The North China Plain ◽  
Transmission Electron ◽  
Cloud Scavenging

Abstract. Aerosol-cloud interaction remains a major source of uncertainty in climate forcing estimate. Our knowledge about the aerosol-cloud interaction is particularly weak in heavily polluted conditions. In this study, cloud residual (cloud RES) and cloud interstitial (cloud INT) particles were collected during cloud events under different pollution levels from 22 July to 1 August, 2014 at Mt. Tai (1532 m above sea level) located in the North China Plain (NCP). Transmission electron microscopy (TEM) was used to investigate size, composition, and mixing state of individual cloud RES and INT particles. Our results show that S-rich particles were predominant (78 %) during clean periods (PM2.5 

scholarly journals Development of placer deposits in the North using highwall mining systems

2021 ◽  
pp. 84-89
Author(s):  
I.I. Kovlekov
Keyword(s):  
Technology Implementation ◽  
Unit Cost ◽  
Mining Industry ◽  
Precious Metals ◽  
Climatic Conditions ◽  
The Arctic ◽  
Practical Case ◽  
Resource Base ◽  
Highwall Mining ◽  
Placer Deposits

The article studies various aspects of the highwall mining systems applicability for the development of productive sands in terms of the occurrence conditions as well as the mining and technical parameters of placer deposits. The harsh climatic conditions of the Arctic zone and the specific properties of frozen sands impose additional requirements on the operation of the mining complex. Positive and negative aspects of the practical application of mining complexes been analysed with reference to the development of precious metals and gemstones deposits. The most promising mining sites have been identified, where the use of highwall mining systems is technologically and economically feasible. Commercial mining of reserves in the boundary zones in high walls of depleted fields and in thin unconventional seams will substantially expand the mineral resource base of mining companies. A promising trend of this technology development is discussed that includes backfilling of the mined-out space in order to reduce the loss of mineral resources. The ice-rock mixture is proposed as the backfill material, which significantly reduces the unit cost of these operations. A practical case of this technology implementation is described for the development of substandard sands of a placer deposit in the Far North conditions. The possibility of developing the reserves of tin placer deposits on the Arctic shelf using the highwall mining systems has been identified as the most promising direction of scientific and practical research for the development of the mining industry in the region.

scholarly journals Heavy metals contamination of the sediments of the south-eastern Baltic Sea: the impact of economic development

Baltica ◽  
2019 ◽  
Vol 32 (1) ◽  
pp. 51-62
Author(s):  
Alexander Krek ◽  
Aleksandr Danchenkov ◽  
Marina Ulyanova ◽  
Darya Ryabchuk
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Baltic Sea ◽  
Metal Concentration ◽  
Bottom Sediments ◽  
Heavy Metal Concentration ◽  
South Eastern ◽  
Heavy Metals Contamination ◽  
The Impact ◽  
Eastern Baltic

The scope of the study was to assess the impact of potential sources of Cu, Zn, Co, Ni, and Cr on bottom sediments of the Russian sector of the south-eastern Baltic Sea. A total of 68 samples were taken and analyzed for grain-size (laser diffraction and sieve method) and heavy metal concentration (atomic absorption spectroscopy method). To avoid the influence of the sorption capacity of the fine-grained sediments to accumulate the pollutants, the normalization of the heavy metal concentration to Fe was applied. The environmental indices (contamination factor and modified degree of contamination) were calculated. The research has shown the contribution of oil platform, pipelines, ports and wastewater treatment facilities on the geochemical composition of bottom sediments. The authors have identified the level of heavy metals contamination of the middle parts of the Curonian and Vistula spits as a result of alongshore transport of pollutants.

scholarly journals Dynamics of the Regional Climatic Conditions over the Past 2000 Years on the Basis of Lithogeochemical Analysis of the Bottom Sediments of Lake Karakyol (Western Caucasus)

2019 ◽  
pp. 73-85
Author(s):  
M. Yu. Alexandrin ◽  
A. V. Darin ◽  
A. M. Grachev ◽  
O. N. Solomina
Keyword(s):  
Bottom Sediments ◽  
Transfer Functions ◽  
Climatic Conditions ◽  
Stable Relationship ◽  
Past 2000 Years ◽  
Regional Temperature ◽  
Meteorological Observations ◽  
Field Works ◽  
The One ◽  
Relationship Of

Reference section of the bottom sediments of Lake Karakyol (Caucasus) is built based on the cores obtained during the 2010 and 2014 field works, taking into account radiocarbon dating and the data of analytical microstratigraphy. Using the methods of scanning micro-XRF, solid preparations of bottom sediments were scanned in 1 mm increments with simultaneous determination of the content of more than 25 rock-forming and microelements. When building the master-core, the profiles of changes in the content of terrigenous elements were taken into account. This made it possible to precisely combine the two cores and remove from the section the sediment intervals corresponding to the “one-time” events – terrigenous material injections. Comparison of instrumental data of regional meteorological observations in the period 1927–2010 with the time series of geochemical indicators showed the presence of a stable relationship of the composition of bottom sediments with the average 11-year temperatures. Approximation of transfer functions to the depth of core testing allowed constructing a paleoclimatic reconstruction of regional temperature for the last 2 millennia with a time resolution of 5–10 years.

scholarly journals The Effect of Natural Factors on the Cultivation and Production of Sesame Crop in Al-Qadisiyah Governorate

2021 ◽  
Vol 32 (2) ◽  
pp. 131-146
Author(s):  
Kawthar Nasser Abbas
Keyword(s):  
Surface Water ◽  
Agricultural Production ◽  
Sand Dune ◽  
Climatic Conditions ◽  
Economic Importance ◽  
Comparative Approach ◽  
Study Approach ◽  
Natural Factors ◽  
Surface Water Resource ◽  
Dune Soil

Sesame crop, one of the very important oily, industrial, and summer crops that is economically important, has been investigated. The plantation and production of this crop has been studied in Al-Qadisiyah governorate during 2003-218. This is because this governorate is well-known by sesame plantation. Such a study helps to know the geographical distribution of sesame agricultural season in 2017-2018, and explore the most important natural factors that affect its plantation. Different research approaches have been adopted based on that facts that need to be met. A field study approach has been used in studying sesame crop descriptively and conceptually, shedding light on its nutritional and economic importance. Moreover, a descriptive comparative approach has been adopted when studying the geographical factors to know about the factors that affect its plantation and production in the area in question. Results have shown that climatic conditions of the area is suitable for its plantation and production. However, the soils of Al-Qadisiyah are of various categories. The best category is the riverbank soil, then comes river basin soil, and the depression soil of poor drainage. The latter has been invested after reclaiming it through planting the rice crop. Another type of soil is the sand dune soil which is unsuitable for agricultural production. Another type is the gypsum desert soil, which is agriculturally poor. Results have further revealed that rivers are considered the main surface water resource in the irrigation process as represented by the Euphrates Riverand its branches within the governorate. This is due to the lack of rain and its fluctuation. 

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