Search
Results:
Vol. 19 (2016 year), No. 1, DOI: 10.21443/1560-9278-2016-1/2
Kashulina T. G., Kashulin N. A., Dauvalter V. A.
The long-term dynamics of hydrochemical indices of low-mineralized subarctic lakes in reducing the acid load
The results of long-term studies (1990–2013) of dynamics of the main hydrochemical indices of the subarctic Shuonijavr Lake located in the zone of airborne pollution from a metallurgical plant have been considered. The following facts have been revealed: significant increase of alkalinity and acid neutralizing capacity (ANC) of the lake water; reduction in the range of seasonal fluctuations of ph and alkalinity; reduction of in the lake water during the observation period as a result of reducing the acid load due to the decrease of SO2 emission. Despite the stabilization of the lake water ANC the pollution indicators in six elements of polluters foreground for the region remain high values
(in Russian, стр.0, fig. 0, tables. 0, ref 0, Adobe PDF, Adobe PDF 0 Kb)
Vol. 21 (2018 year), No. 1, DOI: 10.21443/1560-9278-2018-21-1
Dauvalter V. A., Kashulin N. A.
Distribution of background contents of elements in sediments of Lake Imandra
The background contents of the elements in the sediments of the largest lake of the Murmansk region – Imandra – have been investigated. The background concentrations values of the elements have been determined in the deepest parts of the collected sediment cores. The sedimentation rate in the lakes of North Fennoscandia, including the Murmansk region, is on average 1 mm per year, and the range is between 0.3 and 3 mm/year. The collection of sediment cores 20–25 cm long has been carried out during the study of Lake Imandra. Industrial development of unique deposits of sulfide and apatite-nepheline ores on the watershed of Lake Imandra started in the early 30s of the last century. Consequently, the natural background element contents are fixed in the lower layers of the collected sediment cores. Two groups of elements have been identified by the mathematical statistics methods (correlation and factor analysis): the first group is heavy metals, the second group is alkaline (Na and K) and alkaline-earth metals (Ca, Mg and Sr), Al and P. These elements are in elevated contents in the rock-forming minerals on the catchment area of Lake Imandra: the first group is in the northern part of the catchment area (sulfide copper-nickel ores of Monche Tundra), the second group is in the southeastern part of the catchment area (apatite-nepheline deposits of the Khibiny Alkaline Massif). The largest average background contents of heavy metals (except Co, Pb and As) are noted in the northern part of the Bolshaya Imandra; Ca, Na, Sr, Al and P – in the southern part of the Bolshaya Imandra; Mn – in the Yokostrovskaya Imandra, and Fe – in the Babinskaya Imandra, which is associated with specific conditions for the formation of oxides and hydroxides of these metals in the sediments. The highest background contents of K and Mg are noted in the Babinskaya Imandra, which may be due to the wide distribution of clay minerals with a high content of these metals.
(in Russian, стр.10, fig. 0, tables. 4, ref 27, adobe PDF, adobe PDF 0 Kb)
Vol. 22 (2019 year), No. 1, DOI: 10.21443/1560-9278-2019-22-1
Dauvalter V. A.
Lakes hydrochemistry in the zone of influence of iron-mining industry waste waters
To assess the current ecological state, a study has been conducted on the chemical composition of the lakes' waters which to varying degrees are influenced by the effluents of Olkon JSC (the town of Olenegorsk, the Murmansk region) mined and processed iron ores. The composition of the water of nearby reservoirs has undergone significant changes with the beginning of the activities of Olkon JSC. Mineralization (up to 100 mg/l) and pH values (up to 7.6) of the water of the studied lakes have increased. The qualitative composition of the water of these lakes also changed – the water class has changed from bicarbonate to sulphate. The biotites that make up the gneisses to which the ore bodies of ferruginous quartzites are confined are the main sources of cations K+ and Mg2+, and amphiboles – Ca2+ and Na+. Therefore, the increase in the content of basic ions and the mineralization of lake water is caused by the inflow of filtration water from tailing and waste dumps of Olkon JSC. The advanced content of the nitrogen group compounds (nitrate ion, ammonium ion and total nitrogen) has been recorded in the lakes' water. This increase is associated with the use of explosives containing nitrogen compounds during drilling and blasting operations for the extraction of iron ores. The content of NO3– in water of some lakes is higher than the content of the basic ions Na+, K+, Cl– in terms of equivalent concentrate ion. The flow of pollutants in the composition of wastewater has led to the suppression of biological activity and a decrease in the content of organic matter in the lake water. The highest levels of Ni, Cu, Co, Al, and Sr are recorded in lakes that receive iron ore production effluent. At the same time Fe concentrations are the smallest, which is associated with the pH value increase in the lake water (which decreases the solubility of Fe ions), and with the decrease in the content of organic material, as far as Fe in the lake waters of the Murmansk region is found mainly in the composition of organo-mineral compounds
(in Russian, стр.10, fig. 1, tables. 4, ref 18, Adobe PDF, Adobe PDF 0 Kb)
Vol. 23 (2020 year), No. 1, DOI: 10.21443/1560-9278-2020-23-1
Glazova V. A., Gaponenkov I. A., Fiodorova O. A., Dauvalter V. A.
Fadeev Stream and spring of the same name: Water quality and geo-ecological characteristics
Research of the geoecological and hydrochemical characteristics of the water of the Fadeev Stream (surface source) and the spring "Fadeev Stream" (underground source) located in the Kola District of the Murmansk Region has been carried out in order to identify the influence of the anthropogenic factor on the formation of its hydrochemical composition, caused primarily by the consequences of construction and reconstruction of Eastern bypass highway located around the city of Murmansk. The sampling has been taken accounting the requirements of regulatory documents to perform measurements; the tests have been carried out according to standard methods of hydrochemical analysis. In the course of the study, it has been found that the waters of the Fadeev Stream and the underground source are of natural origin; there is no influence of technogenic factors. The Fadeev Stream water is very soft, slightly mineralized, with significant variations in color depending on the season, there is swamp nutrition of water bodies. The spring water can be described as slightly acidic, very soft, ultra-unleavened with a variable chemical composition depending on the season of the year. The increase in the content of pollutants in the spring water is observed during periods with the most intense precipitation and heavy snowmelt. Precipitation can wash out pollutants from the soil or parent rock. A comparison of the qualitative composition of water from surface and underground water sources has shown that at the sampling points, natural waters have a natural genesis and are not affected by anthropogenic factors.
(in Russian, стр.5, fig. 1, tables. 4, ref 9, AdobePDF, AdobePDF 0 Kb)