Wyniki wyszukiwania

1

Clay minerals of brown rendzina soils from the Male Pieniny Mts.

100%

Zagorski Z.

Annals of Warsaw Agricultural University. Agriculture

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1999

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nr 35

21-29

2

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Electron microscope study of NaCl- and Pb[CH3COO]2-treated kaolinite

100%

Kharitonova G. V., Manucharov A. S., Chernomorchenko N. I., Pavluykov I. A.

International Agrophysics

|

2006

|

tom 20

|

nr 3

3

The influence of mineralogical composition of soil on the consolidation coefficient value

86%

Zablocka K., Lendo-Siwicka M., Wrzesinski G.

Acta Scientiarum Polonorum. Architectura

|

2020

|

tom 19

|

nr 3

4

Interaction of Pb2plus and Zn2plus salts with clay minerals

86%

Kharitonova G. V., Manucharov A. S., Chizhikova N. P., Zemlyanukhin V. N., Chernomorchenko N. I.

International Agrophysics

|

2004

|

tom 18

|

nr 3

5

Surface heterogeneity effects in water vapour adsorption on clay minerals

86%

Sokolowska Z., Stawinski J., Sokolowski S.

International Agrophysics

|

1992

|

tom 06

|

nr 3-4

6

Clay minerals of some European chernozems

72%

Ciolkosz E. J., Uziak S.

Polish Journal of Soil Science

|

2003

|

tom 36

|

nr 2

153-162

Five profiles of chernozems from several European countries were examined in the present study. The chernozems developed from various rocks and differed in their morphology and chemical properties. Mineralogical studies were carried out on the fraction <2 ľm by an X-ray method, using a diffractometer with a proportional recorder. It was found that all European chernozems examined in this study had a similar mineral complex of the clay fraction. Its major components were montmorillonite and illite usually forming mixed structures, whereas kaolinite, quartz, vermiculite and chlorite were present in smaller amounts, and feldspars occurred as trace minerals. Basically, differences in the mineral composition of various profiles and various soil horizons lie in different quantitative relations between the minerals listed above.

7

An attempt of using soil grain size in calculating the capacity of water unavailable to plants

72%

Brogowski Z., Kwasowski W.

Soil Science Annual

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2015

|

tom 66

|

nr 1

8

Comparison of receding contact angles and solid surface free energy components of modified kaolin from thin-layer wicking technioque and sessile drop method

72%

Hajnos M., Matyka-Sarzynska D.

Polish Journal of Soil Science

|

1997

|

tom 30

|

nr 1

9

The importance of mineralogical and micromorphological investigations for the assessment of soil structure

72%

Rampazzo N., Blum W. E. H., Strauss P., Curlik J., Slowinska-Jurkiewicz A.

International Agrophysics

|

1993

|

tom 07

|

nr 2-3

10

Influence of humic acid on the structural properties of kaolin - mercury porosimetry studies

72%

Hajnos M.

International Agrophysics

|

1998

|

tom 12

|

nr 3

11

Structure assessment of two agricultural soils of Lower Austria

72%

Rampazzo N., Blum W. E. H., Strauss P., Curlik J.

International Agrophysics

|

1993

|

tom 07

|

nr 1

12

Chemical forms and distribution of heavy metals in core sediments from the Gdansk Basin, Baltic Sea

58%

Belzunce S. M. J., Szefer P., Wilson M. J., Bacon J., Bolalek J.

Polish Journal of Environmental Studies

|

2007

|

tom 16

|

nr 4

505-515

Short sediment cores (30 cm length) were taken along a transect of the Gdansk Basin from the mouth of the Vistula River out into the Baltic Sea in June 1996. The chemistry and mineralogy of surficial and buried sediments were determined and Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn were analyzed in total and in fractions using a sequential extraction procedure. The bulk and clay mineralogy of the sediments were determined by XRD and SEM. The concentrations of some of the trace metals in sediments are above pre-anthropogenic background. In particular, the surficial samples are substantially enriched in Cu, Pb and Zn, suggesting an anthropogenic origin. The concentrations of Cu, Pb and Zn range from 21-71 ^g-g"1, 56-210 ^g-g"1 and 21-83 ^g-g-1, respectively. Unexpectedly, the concentrations of trace metals increase seawards within the Gdańsk Basin. The forms of binding are different for each metal. Cobalt, Cr and Fe are mainly associated with the residual mineral fraction of the sediment, although in samples with high Fe concentrations there is a significant correlation with organic compounds. In contrast, Mn, Ni, Pb and Zn are predominantly associated with oxides and the organic fractions, with a significant percentage associated with the carbonate and exchangeable cation fractions, whilst Cu is mainly bound with the organic fraction.

13

The role of free iron oxides in the association of lead and cadmium in gleyic phaeozems [black earths]

58%

Dabkowska-Naskret H.

Acta Agrophysica

|

2001

|

tom 50

Twelve samples, collected from four pedons of cultivated soils (black earths) were analyzed by sequential extraction to characterize the role of free iron oxides in the association of lead and cadmium. Amounts of lead and cadmium retained varied from 11 to 89.3% of the total Pb and from 4.8 to 48.7% of the total Cd. Metals associated with amorphous Fe oxides are at least ten times higher than with crystalline Fe forms. Under the existing soil conditions (high pH and CaCO3 content) free iron oxides are components of great importance in the Pb and Cd binding process. However, the results may indicate a stronger association of Pb than Cd with iron oxides in the studied black earths.

14

Powierzchnia wlasciwa jako parametr charakteryzujacy stopien przereagowania kwasow humusowych z bentonitem i illitem

51%

Ksiezopolska A.

Acta Agrophysica

|

1999

|

tom 23

59-64

Mając na względzie fakt, że kwasy humusowe w bardzo małym procencie występują w sianie wolnym w glebie, lecz tworzą połączenia z mineralną częścią gleby, dokonano próby syntetyzowania preparatów kwasów humusowych z bentonitem i illitem oraz scharakteryzowano wybrane właściwości fizykochemiczne tych preparatów jak również określono ich stopień prze reagowania przy różnych wartościach pH, W preparatach tych wykonano pomiary powierzchni właściwej metodą adsorpcji pary wodnej BET oraz molowej energii adsorpcji na podstawie izoterm w dwóch temperaturach (20 i 40 °C). Powierzchnia właściwa illitu i bentonitu po dodaniu kwasów humusowych (kwasu huminowego i p-humusu) przy wszystkich wartościach pH uległa zmniejszeniu. Świadczy to o różnym stopniu ich przereagowania oraz prawdopodobnie o częściowej hydrofobizacji minerałów. Okazało się. że stopień przereagowania preparatów kwasów humusowych z minerałem jest uzależniony od wartości ph oraz, że dla wszystkich kombinacji jest on największy przy pH 4.

15

Distribution of heavy metals in the River Ulla and its estuary [North-West Spain]

51%

Belzunce Segarra M. J., Helios-Rybicka E., Prego R.

Oceanological Studies

|

1997

|

tom 26

|

nr 2-3

16

Zmiany wlasnosci powierzchniowych gleb i mineralow ilastych w procesach zakwaszania i alkalizacji. Badania modelowe

44%

Jozefaciuk G.

Acta Agrophysica

|

1998

|

tom 15

1-115

Acidification has become recently an important environmental problem in many countries. Despite huge amount of papers published in this topic, there exist many knowledge gaps, particularly in the area of surface properties of soils and minerals and their alteration after acidic degradation of soils. Alkalization of soils, being a problem of arid zone countries, has been studied mainly from the point of view of soil amelioration and no results of the detailed studies on surface reaction with alkali are available as well. The aim of the studies performed in the present paper was to observe the changes of the surface properties of soils and clay minerals under acid and alkaline conditions in more details. Particular attention was directed upon surface inhomogeneity. Samples of most abundant clay minerals and soiJs of various mineralógica) composition were acidified and alkalized with extreme concentrations of HCL and NaOH, and studied via water vapor adsorption-desorption, mercury intrusion porosimetry and back-titration experiments. Adsorption, porous and variable surface charge properties were studied by estimations of surface areas, average adsorption energies, adsorption energy distribution functions, micro and mesopores radii and volumes, pore size distributions, fractal dimensions, amount of variable charge and apparent surface dissociation constants distributions. The general changes of the selected materials were registered also, using XRD patterns, solubility, CEC, Mossbauer spectra, magnetic susceptibility, clay and organic matter content measurements. Marked changes of the studied surface characteristics were observed in most of the materials investigated. The general tendencies of these changes for all of the samples were difficult to establish due to the great variability of natural materials, however, a few of the surface characteristics (e.g. surface areas, fractal dimension of micropores, amount of variable charge, average value of apparent surface dissociation constant) changed in a given direction with pH of acidification and/or alkalization. These characteristics may possibly be used for monitoring of environmental processes accompanied with changes of soil reaction.

17

Energia powierzchniowa i wielkosci jej skladowych jako parametry okreslajace zwilzalnosc i stan agregacyjny wybranych mineralow ilastych i gleb

44%

Hajnos M.

Acta Agrophysica

|

1999

|

tom 17

1-112

In the present work problems related to surface free energy of different agricultural materials such as clay minerals, mineral soils, organic soils and forest litter were considered. Methodical investigations of surface free energy determination as well as fundamental investigations connected with the influence of the surface cations and organic substance on the wettability, free energy and interaction forces between clay minerals and soil particles were undertaken. The interaction forces between clay minerals and soil particles perform a fundamental role in aggregation, flocculation and forming of solids structure. In case of solids the surface free energy can be determined indirectly for example from the measured contact angles or from the adsorption values (by determination of film pressure jt) with appropriate theoretical assumptions. Such methods were applied in this paper to determine surface free energy components for clay minerals and soils. Because of difficulties in contact angle measurements by sessile drop method (especially for organic soils and humus) thin layer wicking or thin column wicking technique were applied. The investigations of penetration rates of water and organic liquids carried out for clay minerals and their mono ionic forms showed the close dependence between the kind of mineral and surface cation. The linear dependence of penetration rates was obtained at the lowest penetration times for bentonite and the highest for kaolin. The kind and properties (e.g. radius of hydrated ions) play in this case an important role. The empiric series of wettability, depending on clay mineral and surface cation were determined experimentally. Similar measurements were performed for clay minerals with increasing additions of humic acid and for different soils. On the basis of the measurements the surface free energy components apolar and polar (electron-acceptor and electron-donor) were calculated and correlated with the kind of clay mineral, surface cation and humic acid content. The investigations for soils show that the penetration times depend on the soil samples. Contact angle values for investigated samples were also calculated. From the water vapour adsorption measurements on the surfaces of modified clay minerals and soils the water film pressure values were calculated for one or three monolayers and compared with the work of adhesion and immersion. For soil materials surface free energy had real influence on structure formation or its changes. The organic matter and surface cations had an important role in creation of soil structure.

18

Wplyw ekstremalnych zmian odczynu na niejednorodnosc energetyczna i geometryczna powierzchni muskowitu.

44%

Jozefaciuk G., Sokolowska Z.

Acta Agrophysica

|

1999

|

tom 23

47-57

Muskowit o dobrze zdefiniowanej strukturze krystalicznej poddano reakcji z kwasem solnym i zasadą sodową o różnych stężeniach. W wyniku reakcji, sieć krystaliczna minerału nie ulegała destrukcji (brak zmian w widmach rentgenowskich), natomiast wyraźnym zmianom ulegały właściwości powierzchni minerału. Zmiany powierzchniowe były inne w warunkach zakwaszania i w warunkach alkalizacji. Słowa kluczowe; adsorpcja, energia adsorpcji, mikroporowatość, muskowit, niejednorodność, stała dysocjacji, wymiar fraktalny jego powierzchni. W obu środowiskach następuje roztwarzanie zanieczyszczeń o charakterze amorficznym. W środowisku kwaśnym - głównie tlenków glinu i żelaza, natomiast w zasadowym - tlenków glinu oraz krzemu.

Ograniczanie wyników

Clay minerals of brown rendzina soils from the Male Pieniny Mts.

Electron microscope study of NaCl- and Pb[CH3COO]2-treated kaolinite

The influence of mineralogical composition of soil on the consolidation coefficient value

Interaction of Pb2plus and Zn2plus salts with clay minerals

Surface heterogeneity effects in water vapour adsorption on clay minerals

Clay minerals of some European chernozems

An attempt of using soil grain size in calculating the capacity of water unavailable to plants

Comparison of receding contact angles and solid surface free energy components of modified kaolin from thin-layer wicking technioque and sessile drop method

The importance of mineralogical and micromorphological investigations for the assessment of soil structure

Influence of humic acid on the structural properties of kaolin - mercury porosimetry studies

Structure assessment of two agricultural soils of Lower Austria

Chemical forms and distribution of heavy metals in core sediments from the Gdansk Basin, Baltic Sea

The role of free iron oxides in the association of lead and cadmium in gleyic phaeozems [black earths]

Powierzchnia wlasciwa jako parametr charakteryzujacy stopien przereagowania kwasow humusowych z bentonitem i illitem

Distribution of heavy metals in the River Ulla and its estuary [North-West Spain]

Zmiany wlasnosci powierzchniowych gleb i mineralow ilastych w procesach zakwaszania i alkalizacji. Badania modelowe

Energia powierzchniowa i wielkosci jej skladowych jako parametry okreslajace zwilzalnosc i stan agregacyjny wybranych mineralow ilastych i gleb

Wplyw ekstremalnych zmian odczynu na niejednorodnosc energetyczna i geometryczna powierzchni muskowitu.