Wyniki wyszukiwania - AGRO

1

X-ray fluorescence spectrometry in speciation analysis of bottom sediments

100%

Baranowski R., Rybak A., Sobczynski T.

Polish Journal of Environmental Studies

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2001

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tom 10

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nr 5

This paper presents results of speciation analysis of bottom sediments. In our examinations a five-step extraction procedure was applied. Direct analysis of sediments and analysis of extracts was carried out by X-ray fluorescence spectrometry with wavelength dispersion. Examinations were carried out with the use of lake sediments CRM.

2

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Differences in the chemical composition of bottom sediments in three lakes in the Polesie Lubelskie Region

100%

Misztal M., Szafran K.

Acta Agrophysica

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2002

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tom 68

3

Acoustic properties of the Pomeranian Bay bottom sediments

88%

Tegowski J., Klusek Z.

Oceanologia

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1999

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tom 41

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nr 3

4

The influence of some factors on phosphate solubilization by microorganisms in bottom sediments of different types

88%

Niewolak S., Korycka A., Krasnicki K.

Polish Journal of Environmental Studies

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1996

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tom 05

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nr 6

This work concerns the influence of temperature, the presence (lack of oxygen and different carbohydrates) on solubilization of tribasic calcium phosphate, iron phosphate and Thomas basic slag in samples of bottom sediments of gyttja, sapropel, "dy" and tyrfopel types from lakes of different trophic lakes of the Mazurian Lake District. In samples of 4 types of bottom sediments more PO4-P from phosphate compounds gathered at 25° C than at lower temperatures in situ in lakes; besides, there were more in anaerobic conditions than in aerobic ones, in bottom sediments samples with Ca3(P04)2 more PO4-P gathered at pH 4-5, in samples with FeP04 at pH 5-6, in samples with Thomas basic slag at pH 4-6. More PO4-P was in samples of bottom sediments with addition of glucose, saccharose, mannose and arabinose, less with the addition of xylose and cellobiose independently from used phosphate compounds. Greater amounts of PO4-P gathered in the samples of bottom sediments of gyttja and sapropel types, lower in the samples of "dy" and tyrfopel types. In all series of the experiments the highest amounts of P04-P gathered in a logarythmic phase of the development of natural population of bacteria.

5

Possible secondary mobilization of heavy metals from bottom sediments under conditions of anticipated climate change

88%

Rudzinska-Zapasnik T.

Geographia Polonica

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1998

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tom 71

6

Speciation of heavy metals in bottom sediments of lakes

88%

Zerbe J., Sobczynski T., Elbanowska H., Siepak J.

Polish Journal of Environmental Studies

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1999

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tom 08

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nr 5

The work reported in this paper deals with the content of trace metals (Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) in bottom sediments of Goreckie Lake, situated in Wielkopolski National Park, Western Poland. Apart from total concentration, the distribution of the above metals into five fractions: exchangeable, bound to carbonates, bound to Fe-Mn oxides, bound to organic matter, and residual was studied by means of an analytical procedure involving sequential chemical extractions.

7

Determination of selected sulphur speciation forms in fresh water lakes and bottom sediments

88%

Puacz W., Szahun W., Siepak J., Sobczynski T.

Polish Journal of Environmental Studies

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2001

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tom 10

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nr 5

Analytical procedures for the determination of selected speciation forms of sulphur have been proposed. The method for conversion of sulphur sols into homogeneous solutions sols allowing simultaneous determination of sulphur either in model solutions or in sols environmental samples has been described. The methods for determination of sulphur sols, elemental sulphur, soluble and insoluble sulphides, sulphates and total sulphur have been optimized. Selected speciation forms of sulphur were determined in the same samples of water and bottom sediments from the eutrophic lakes Lipno and Kiekrz, lying close to Poznan. The speciation analysis proposed is based on the catalytic, chromatographic, ion-selective methods and absorption spectrometry. The concentrations of the speciation forms of sulphur determined ranged from micrograms to milligrams per litre.

8

The Puck Bay as an example of deep dredging unfavorably affecting the aquatic environment

75%

Graca B.

Oceanological and Hydrobiological Studies

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2009

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tom 38

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nr 2

109-127

9

Year over year comparison of sediment quality in the rivers of Eastern Slovakia

75%

Singovszka E., Balintova M.

Przegląd Naukowy. Inżynieria i Kształtowanie Środowiska

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2020

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tom 29

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nr 3[89]

10

Humic substances in the Baltic sediments. I. Isolation and preliminary characterization of humic substances

75%

Bojanowski R., Pempkowiak J., Kupryszewski G.

Oceanologia

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1977

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tom 07

11

Analysis of heavy metals in particular granulometric fractions of bottom sediments in the Mala Welna River [Poland]

75%

Frankowski M., Ziola A., Siepak M., Siepak J.

Polish Journal of Environmental Studies

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2008

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tom 17

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nr 3

343-350

The paper presents the results of determinations of heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) in 24 samples of bottom sediments collected in six gauging cross-sections along the course of the Mała Wełna river (western Poland). The samples were collected once a month from May to August 2006. The determinations were made separately in the following granulometric fractions: >2.0, 2.0-1.0, 1.0-0.5, 0.5-0.25, 0.25-0.1, 0.1-0.063, and <0.063 mm, using 3M HCl as the extraction agent. The concentrations of the heavy metals studied were lowest in the 0.5-0.25 and 0.25-0.1 mm fractions, and the highest in the 0.1-0.063 and <0.063 mm fractions, and also in the larger fraction. The determinations were made using atomic absorption spectrometry with flame atomization (F-AAS).

12

Does inflow of water river shape the nutrient content of lake sediments?

75%

Potasznik A., Szymczyk S.

Journal of Elementology

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2016

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tom 21

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nr 2

This study evaluated the influence of the Symsarna River on the spatial distribution of organic matter, Kjeldahl nitrogen (NK) and total phosphorus in the surface layer of bottom sediments. The analyzed site was Symsar Lake in the Olsztyn Lakeland (north-eastern Poland) and the inflows. The results of this study indicate that the lake’s morphology and inflowing streams were largely responsible for the variations in the nutrient content of bottom deposits in the flow-through Symsar Lake. The NK content was significantly correlated with the lake’s depth, whereas TOC levels were determined mainly by the location in the lake. The surface layers of bottom sediments in Lake Symsar were characterized by an average organic matter content of 171.2 g kg-1 and near-neutral pH (6.78-7.77). The average contents of components in the analyzed sediments were determined at 62.01 gTOC kg-1 d.m., 6.08 gNK kg-1d.m. and 2.18 gTP kg-1d.m. Converted to fresh mass, the above contents expressed per square meter of the lake’s sediment reached 3.95 kgTOC m-2 f.m., 0.42 kgNK m-2 f.m. and 0.18 kgTP m-2 f.m. In turn, the average concentrations of components in sediments from the streams, likewise per square meter, equalled 12.4 gTOC m-2 d.m., 0.93 gNK m-2 d.m. and 0.9 gTP m-2 d.m. The highest contents of the analyzed components were observed in bottom sediments near the outflow of a river from the lake and in the lake’s region intersected by the river. The Symsarna River was responsible for the transport of and variability in the deposition of mineral fractions, and for the nutrient accumulation in the surface layer of bottom sediments. A flow-through water body in a river-lake system can contribute to retention in periods when it exerts a negative impact on the trophic status of a lake. From a broader, ecological viewpoint, it can inhibit the transport of pollutants outside the catchment.

13

Effect of bottom sediment on content, bioaccumulation and translocation on heavy metals in maize biomass

75%

Jasiewicz C., Baran A., Tarnawski M.

Journal of Elementology

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2010

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tom 15

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nr 2

281-290

The research aimed to assess the effect of bottom sediment on the content, bioaccumulation and translocation of heavy metals in maize biomass. The investigations were conducted in 2006-2007 as a pot experiment on light soil of the granulometric composition of weakly-loamy sand. The experimental design comprised 3 treatments: without sediment (I), a 5% sediment admixture (II) and a 10% sediment admixture to the soil (III). Bottom sediment was added to the soil in the first year of the investigations. The content of Zn, Cu, Ni. Pb, Cd and Cr was determined using the ICP-EAS method in the plant material after its dry mineralization and ash solution in HNO3. The uptake of the above-mentioned metals by maize was computed alongside their bioaccumulation and translocation coefficients. The effect of bottom sediment admixture on heavy metal concentrations in maize was determined to be varied, e.g. a 5% dose of sediment added to soil decreased the content of all the analyzed heavy metals in the biomass of maize aerial parts, whereas a 10% admixture increased the content of Cu, Ni, Pb and Cr. The values of bioaccumulation coefficients revealed that an admixture of both doses of bottom sediment led to a decreased accumulation of Zn, Cu, Cd, Cr and Ni (5% dose) in maize aerial biomass. Moreover, the plant more easily accumulated Zn, Cd and Cu than Cr, Ni or Pb. Permissible amounts of heavy metals in plants to be used as animal fodder were not exceeded in the maize biomass.

14

Heavy metals in beach deposits, bottom sediments of a Baltic fishing port and surface water

75%

Antonowicz J. P., Grobela M., Opalinska M., Motala R.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

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2017

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tom 21

Concentrations of metals, i.e. As, Cd, Cu, Mn, Ni, Pb, Zn were analysed in bottom deposits of a marine port in Ustka and within the adjacent beach sections. Metal concentrations within the port channel may be ordered in terms of increasing values as: Cd < As < Ni < Zn < Cu < Pb < Mn. Heavy metal concentrations detected in port sediments were much higher than those in beach deposits. Samples of surface waters were also collected from the port channel, harbour basins and nearby beaches and selected physico-chemical indexes were determined, including heavy metal concentrations.

15

Spectral structure of surface waves and its influence on sediment dynamics

75%

Divinsky B. V., Kosyan R. D.

Oceanologia

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2019

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tom 61

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nr 1

16

Internal loading of phosphorus from sediments of Swarzedzkie Lake [Western Poland]

75%

Kowalczewska-Madura K., Goldyn R.

Polish Journal of Environmental Studies

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2009

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tom 18

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nr 4

635-643

Sediments, being the most important source of phosphorus (P) in the shallow (max. depth 7.2 m), polymictic Swarzędzkie Lake during the summer, were thoroughly studied in laboratory experiments with intact cores sampled at 7 stations in four seasons of the year. Under anaerobic conditions P release rates peaked in the samples from the deepest part of the lake at 26.86 mgP m⁻²d⁻¹. However, the highest rates were determined at one of the littoral sites (near the mouth of a polluted stream) at 59.5 mgP m⁻²d⁻¹. Littoral P release coincided with occasionally low oxygen concentrations (0.2 mgO₂ l⁻¹) above the bottom. On the scale of the whole lake, P release from the littoral zone, where both temperature and oxygen concentration were highly variable, had the strongest influence on the trophic state. It accounted for 63% of the annual internal load but only 55% of total lake area.

17

Preliminary characteristics of some bottom sediments of the Baltic Sea

75%

Szponar Z., Rzechula J., Pielak A.

Oceanologia

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1985

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tom 20

18

Kelvin-Helmholtz instabilities in the Colorado River Delta, Gulf of California

75%

Carbajal N., Vargas J. T., Rodriguez J. H. G., Montano Ley Y., Salas de Leon D. A.

Oceanologia

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2021

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tom 63

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nr 3

19

Speciation analysis of phosphorus in bottom sediments - comparison of two methods

75%

Siwek H.

Journal of Elementology

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2010

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tom 15

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nr 1

161-170

The purpose of this paper was to compare two methods of fractionation of reactive phosphorus forms (RP) in bottom sediments of polymictic water reservoirs located in rural areas. As a criterion for estimation, quantities RP extracted in analyzed fractions versus the general content of Al, Fe and Ca were used. The sediments were collected in springtime, from rural areas with different land use in the drainage basin (arable fields, uncultivated land, farmyards). The sediments were collected with a KC-Denmark core sampler for bottom sediments, which makes it possible to collect samples leaving the upper structure of 6 cm in thickness intact. After mineralization, each sample was analyzed for the general phosphorus content and a speciation analysis was performed by two methods. With the first method (M1), the RP bonded to Al (Al_RP), Fe (Fe_RP) and Ca (Ca_RP) was determined. The second method (M2) was applied to determine fractions of reactive phosphorus released from the sediments under reduced conditions, mainly from bonds with iron and manganese (BD_RP), adsorbed on aluminium oxides mainly AL2O3 and other surfaces (NaOH_RP) and apatite phosphorus and bonds with carbonates. In almost all the sediments, most RP was determined in the phosphorus fractions with Ca extracted with acid solution. For the fractions obtained via the M1 method, more of the general RP, as well as phosphorus bonded to calcium and iron was found than for fractions obtained with the M2 method, and the differences might be attributed to translocation of phosphorus from organic to inorganic compounds during fractioning. The fraction of reactive phosphorus determined with the M1 method is correlated more strongly with the general content of the metal in the sediments than reactive phosphorus fractions determined with the M2 method. The strong correlation between the content of iron and the fraction of BD_RP in mineral sediments shows that it can be an indicator of the sensitivity of sediment to changes in the redox potential.

20

Internal phosphorus loading from bottom sediments of a shallow preliminary reservoir

75%

Dondajewska R.

Oceanological and Hydrobiological Studies

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2008

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tom 37

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nr 2

89-97

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