7 research outputs found

    Nitrogen behavior in the shallow groundwater–soil system within agricultural landscapes

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    The research is devoted to the analysis of the changes in the chemical composition of shallow groundwater within the agricultural landscapes of the Poyang Lake area taking into account the peculiarities of soil composition. The analysis is based on field data collected during 2011–2017 by the sampling of the shallow groundwater from the private and public wells and adjoining soils. Correlations between the content of the N-compounds and the Eh values in autumn as well as a relationship of the NH4+ concentration with the DOC content reflect the processes of the organic matter transformation in the aquifer. Correlations between the N content in the upper soil horizon and the concentrations of the N-compounds in the shallow groundwater indicate a strong connection of the origin of the groundwater chemical composition with the soil composition

    Size fractionation of trace elements in the surface water and groundwater of the Ganjiang River and Xiushui River basins, China

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    The research of trace element behaviour and size fractionation is significant to understand the processes in the water-rock system. Moreover, the aqueous speciation of trace elements is strongly related to their distribution and toxicity. In this research, trace elements behaviour and their size fractionation are investigated in the natural water (the surface water and shallow groundwater) of the Ganjiang River and Xiushui River basins. Trace element concentrations were measured by ICP-MS. The authors estimated the size fractionation of the trace elements between suspended forms (>0.45 [mu]m) and dissolved fractions, which included truly dissolved (1 kDa) and colloidal particles (0.45 [mu]m-1 kDa)), after filtration through a 0.45 [mu]m acetate cellulose membrane filter. The distinct features of the trace element size fractionation were identified. The size fractionation of the trace elements under different conditions (in the surface water and shallow groundwater) was studied

    Water–rock interaction within the oligotrophic peat bog (part of the Vasyugan Swamp, Western Siberia)

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    Geochemical conditions of the formation of various minerals were studied within the oligotrophic pine-shrub and sphagnum peat bog. It was shown that at least two complex barriers function within the peat deposit. These barriers correspond to the changes in the advective and diffusion transfer of substances and promote the immobilization of Fe and a number of other chemical elements. The upper complex geochemical (redox, sulfide and sorption) barrier occurs approximately at the depths of 0.40 to 1.25 m. The lower complex geochemical (alkaline and sorption) and mechanical barriers are located at the bottom part of the peat deposit (the depth of 2.25–2.50 m)

    Preliminary studies of surface water quality in Damodar River basin (West Bengal, India)

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    The purpose of the research was to study the main parameters of the chemical composition of surface water and its quality in the Damodar River basin near the Durgapur city where the surface water is used for water supply of the local community. During fieldwork water of the Damodar River, its tributaries (Tamla River and small streams - receivers of industrial wastewater and drainage water) and the Maithon Reservoir was sampled from the layer 0.1-0.5 m. Preliminary studies have shown that the main pollutants in the study area are organic compounds, ammonium, phosphate and fluoride ions. Deterioration of water quality in some sampling points is connected with a low content of dissolved oxygen and high concentrations of nitrite, chloride and sulfate ions

    Preliminary studies of surface water quality in Damodar River basin (West Bengal, India)

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    The purpose of the research was to study the main parameters of the chemical composition of surface water and its quality in the Damodar River basin near the Durgapur city where the surface water is used for water supply of the local community. During fieldwork water of the Damodar River, its tributaries (Tamla River and small streams - receivers of industrial wastewater and drainage water) and the Maithon Reservoir was sampled from the layer 0.1-0.5 m. Preliminary studies have shown that the main pollutants in the study area are organic compounds, ammonium, phosphate and fluoride ions. Deterioration of water quality in some sampling points is connected with a low content of dissolved oxygen and high concentrations of nitrite, chloride and sulfate ions

    Isotopic composition ([delta]{18}O and [delta]D) of the shallow groundwater in the Poyang Lake basin

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    The article is focused on the identification of evaporation and other natural processes which affect the isotopic composition of shallow groundwater in the Poyang Lake basin, such as water-rock interaction and mixing of the shallow groundwater and surface water. For this purpose the dual isotope approach ([delta]D–H[2]O and [delta]{18}O–H[2]O) was used. The samples were collected from domestic wells around the Poyang Lake. The value of [delta]D obtained for the shallow groundwater ranges from -21.5 to -42.6/. The [delta]{18}O value varies from -3.5 to -7.1/. It was found that the shallow groundwater of the Poyang Lake catchment is of meteoric origin. The influence of evaporation on the isotopic composition of shallow groundwater is negligible and observed mainly during the dry season. The deviation from the local meteoric water line, especially during the rainy season, may be explained by the processes in the water-rock system, but this issue is required further research

    Conditions of transformation of municipal wastewater in bog ecosystems (on the example of Obskoe bog, Western Siberia)

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    Актуальность. Проблема охраны и использования болот является весьма актуальной во всем мире, в том числе в Западной Сибири, на территории которой добывается значительная часть углеводородного сырья в Российской Федерации, что сопровождается изменением окружающей среды, в том числе и болотных экосистем. В свою очередь, это определяет необходимость разработки методологии и технологий природоохранных мероприятий на болотах, подвергающихся антропогенному воздействию. В рамках такой методологии требуется достоверная оценка изменений состояния болотной экосистемы под влиянием поступления веществ антропогенного происхождения. Цель: анализ и обоснование условий трансформации коммунально-бытовых сточных вод в низинном болоте на примере типичного для Западной Сибири евтрофного Обского болота. Методы. Химический и микробиологический составы вод и торфов исследовались в Проблемной научно-исследовательской лаборатории гидрогеохимии (ТПУ), зарегистрированной в Системе аналитических лабораторий Госстандарта России. Для проведения полного химического анализа использовались традиционные методы. Микробиологический анализ производили после отбора проб, как правило, в течение суток. Доставка проб в лабораторию осуществлялась в сумке-холодильнике. Для выявления микроорганизмов использовали жидкие и твердые элективные питательные среды. Микрокомпонентный состав определялся при помощи масс-спектрометрического метода с индуктивно-связанной плазмой (ICP-MS). Структурно-групповой состав растворенных органических веществ изучался методом хромато-масс-спектрометрии в лаборатории разработки месторождений нефти и газа (ТПУ). Для изучения гидрогеохимических процессов применялись статистические методы и математическое моделирование. Результаты и выводы. Установлено, что болотные воды относительно ПДК характеризуются повышенными содержаниями органических веществ, продуктов их трансформации, а также некоторых химических элементов, с которыми органические вещества способны образовывать комплексы. Среди растворенных органических соединений в болотных водах доминируют сложные эфиры, карбоновые кислоты, которые способствуют не только накоплению некоторых элементов (Ni, Ba) в водах, но и развитию микроорганизмов. Показано, что накопление веществ, поступающих с коммунально-бытовыми сточными водами с. Мельниково, происходит в основном на границе деятельного и инертного горизонтов торфяной залежи. Показано, что сброс коммунально-бытовых сточных вод в болото (с. Мельниково) не приводит к существенному изменению химического состава болотных вод, а антропогенное воздействие лимитируется микробиологическими и геохимическими условиями в болоте. На основе полученных данных предложено скорректировать природоохранные мероприятия, ограничивающие рост заболоченности территорий за счет увеличения лесных угодий вследствие осушительных мелиораций и дополнительного внесения соединений азота и кальция, входящих в состав сточных вод жилищно-коммунального хозяйства и нефтегазодобывающего комплекса.Relevance. The issue of conservation and use of bogs is very urgent throughout the world, including Western Siberia, where a large part of hydrocarbon raw materials in the Russian Federation are extracted. It is accompanied by environmental changes, which concern bog ecosystems. This determines the relevance to develop a methodology and technology for environmental protection of bog ecosystems subjected to anthropogenic impact. For this methodology, a reliable assessment of changes in the bog ecosystem under the influence of the influx of substances of anthropogenic origin is required. The aim of the research is to analyze and interprete the conditions of municipal wastewater transformation in lowland bog on the example of typical Western Siberian eutrophic bog Obskoe. Methods. Chemical and microbiological composition of natural waters were analyzed in the Fundamental research laboratory of hydroge-ochemistry (TPU), which is registered in the System of analytical laboratories of Gosstandart of Russia. To carry out the comprehensive chemical analysis the authors applied the traditional methods. The microbiological analysis was carried out after sampling, basically during the day. The samples had been kept in the cooling bag until they were delivered to the laboratory. To identify the microorganisms the authors used liquid and firm elective nutrient mediums. The trace elements were determined by inductively coupled plasma mass-pectrometry (ICP-MS). The structural-group composition of dissolved organic matter was determined by gas chromatography-mass spectrometry method. Statistical methods and mathematical modeling were applied to study hydrogeochemical processes. Results and conclusions. It was found that the bog waters are characterized by high contents (relative to maximum permissible concentrations) of organic matters, products of their transformation, as well as some chemical elements, which are able to form complexes with organic matters. Among the dissolved organic compounds esters, carboxylic acids are dominated in the bog waters. They contribute not only to accumulation of certain elements (Ni, Ba) in the waters but to development of microorganisms as well. It was shown, that accumulation of the elements entering the bog waters from municipal wastewater of Melnikovo settlement takes place mainly on the boundary of active and inert horizons of the peat deposit. It was shown, that the discharge of municipal wastewater to the bog near Melnikovo settlement does not significantly change the chemical composition of the bog waters, and anthropogenic impact is limited by microbiological and geochemical conditions of the bog. Based on the data obtained, it was proposed to adjust environmental measures to limit the expansion of boggy areas by the increase in forest land due to drainage reclamation and the addition of nitrogen and calcium compounds that are part of municipal wastewater and wastewater of oil and gas industry
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