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1

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

100%
Bojanowski R., Pempkowiak J., Kupryszewski G.
Oceanologia
|
1977
|
tom 07
2
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Effect of the soil type on the molecular structure, properties and conditions of occurrence of humous acids

100%
Ksiezopolska A.
Acta Agrophysica
|
2000
|
tom 35
The study presented here concentrates on the characteristics of the humous compounds of humic and fulvic acid fractions of ß-humus, originating from the typologically differentiated soils (podzolic soil and chernozem). The soils were chosen so as to emphasize differences between chemical structure and degree of aromatic nucleus condensation in the humous acids isolated from them. It was found that the structure of the humous substances isolated from the podzolic soil is characterised by the lowest degree of condensation of the aromatic nucleus and the lowest polymerisation, while the humous acids from the chernozem are characterised by the highest degree of condensation of the aromatic nucleus and the strongest polymerisation.
3
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Effect of water regimes on sorptivity and organic matter humic components of soil

84%
Raut S., Sahoo N., Chakraborty H.
International Agrophysics
|
2012
|
tom 26
|
nr 1
The aim of the study was to find the effect of water regimes on soil sorptivity and humic components of organic matter. Physicochemical parameters were also determined. Steady state cumulative infiltration was the highest (60-100 mm) in non-irrigated upland soil and the lowest (8-10 mm) in waterlogged soil. The highest sorptivity of 4.0-4.5mmmin-1/2 was found in nonirrigated upland soil and the lowest in seasonally waterlogged soil (1.0-1.5 mm min-1/2). Organic carbon content of all soils was low (<1%), EC values were also low (< 4 dS m-1). Saturated moisture was high in waterlogged soil. The non-irrigated upland soils had a higher fraction of fulvic acid (0.15-0.2%), due to which they were more capable of infiltration, whereas waterlogged soils had a greater fraction of insoluble humic acid (0.29-0.35%) and exhibited less cumulative infiltration. Sorptivity decreased as the clay content, pH, EC, porosity and humic acid content of the soil increased.
4

The input of organic matter to the Baltic from the Vistula River

84%
Pempkowiak J., Kopryszewski G.
Oceanologia
|
1980
|
tom 12
5

Fungal biosolubilization of Polish lignite: the effect of substrate concentration

84%
Miszkiewicz H., Marchut-Mikolajczyk O., Mielcarz L., Bielecki S.
Electronic Journal of Polish Agricultural Universities. Series Agronomy
|
2018
|
tom 21
|
nr 1
6

Sulfur cycling and the sulfurization of humic and fulvic acids in the sediments of the rivers Rupel [Belgium] and Authie [Northern France]

84%
Lojen S., Cermelj B., Wartel M.
Oceanological and Hydrobiological Studies
|
2007
|
tom 36
|
nr 1
7

Metabolic activity of heterotrophic bacteria in the presence of humic substances and their fractions

84%
Donderski W., Burkowska A.
Polish Journal of Environmental Studies
|
2000
|
tom 09
|
nr 4
Metabolic activity of heterotrophic bacteria isolated from lakes Stęgwica, Jeziorak and Jasne were investigated. A humic substances of commercial preparation by Aldrich-Chemie, as well as natural humic substances, fulvic and humin acids isolated from lake Stegwica were used as a source of energy. The results indicate that 70-80% of bacteria strains are able to utilise the humus matter. The greatest metabolic activity was recorded in bacteria which were supported by natural humic substances isolated from lake Stęgwica; whereas the lowest was noted in the presence of humin acids.
8

The rate of microbial decomposition of soil humic compounds: the effect of acid rain induced Al depletion. Running head: Acid rain and the decomposition of humic substances

84%
Grodzinska-Jurczak M., Mulder J.
Polish Journal of Environmental Studies
|
1997
|
tom 06
|
nr 5
The effect of aluminum complexation on the net decomposition rate of purified humic acid (HA) and fulvic acid (FA), extracted from a podzol B horizon in the Netherlands, were studied at room temperature (20°C). Net decomposition rates were determined from C02 evolution from samples as measured by gas-chromatography. Increasing aluminum additions significantly reduced the decomposition rate of HA, of FA ,and of organic matter in podzol B horizons, whereas pH had no notable effect on decompostion rates. Results indicate that at the current high depletion rates of organically-bound soil Al, due to acid rain, the decomposition of soil humic compounds may increase significantly. This may have serious consequences for the ecologically relevant pool of humic compounds in forest soils.
9
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Peculiarities of the chemical composition and the molecular structure of peat humic substances

84%
Bambalov N., Smychnik T., Maryganova V., Strigutsky V., Dite M.
Acta Agrophysica
|
2000
|
tom 26
The main result of the investigation concerning pecularities of peat humic substances ( humic and fulvic acids)with the use of CNMR spectroscopy, thermal analysis, pyrolysis mass- spectrometry, oxidation destruction, gel- chromatography and electronic paramagnetic resonance are shown in this paper.
10

Badania preparatow borowinowych z wykorzystaniem spektrofotometrii absorpcyjnej UV-VIS

67%
Drobnik M., Latour T., Krawczyk B.
Roczniki Państwowego Zakładu Higieny
|
2007
|
tom 58
|
nr 4
657-666
11

Resources and fractional composition of humus in soils of convent gardens of Cracow

67%
Gasiorek M., Niemyska-Lukaszuk J.
Polish Journal of Soil Science
|
2008
|
tom 41
|
nr 1
1-11
Investigations were conducted to determine the impact of urban environment and cultivation on the content and fractional composition of humus in anthropogenically transformed soils of selected convent gardens in Cracow. Convent gardens in Cracow, mostly utilised as vegetable gardens, are located in densely built up city areas. On the basis of conducted research, it was established that hortisols of studied gardens are characterised by a high abundance of good quality humus. Humines and humic acids prevail over fulvic acids in humus compounds of these soils. Value of C:N ratio evidences advanced mineralisation of organic matter and good biological activity of soil.
12
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Characteristics of humic substances in humid subalpine forest soils in Central Taiwan

67%
Chen J. S., Chiu C. Y.
Acta Agrophysica
|
2001
|
tom 50
The study site, 2700 m a.s.l., is located in the central Taiwan. A globally rare combination of the mean temperature (ca. 9.5 °C) and total annual precipitation (ca. 4100 mm) makes studies on pedogenic and edaphic processes of the moist soils in this area worthwhile. The study was undertaken to investigate distribution and characteristics of humic substances in this subalpine forest ecosystem. Fulvic acids comprised a higher total organic carbon fraction (1.8 to 25%) than humic acids (1.1 to 13.4%). Fulvic acids were more mobile and migrated downwards to deeper horizons. Comparatively, humic acids were distributed more in the surface horizons. The hu- mification index, based on E4/E6, showed that humification varied in different horizons even in the same profile. The AlogK and RF values indicate that the types of humic acids extracted from Tsuga forest soil are grouped as P or A types, whereas Rp or B types are in Picea forest soil, suggesting a high degree of humification of humic acids in such soils. Features of the absorption spectra were consistent with the classification of humic acids with A logK and RF values. Humification indices and humic acid types in these subalpine soils indicate that they are similar to acidic soils elsewhere with abundant rainfall and cold climate.
13
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Investigation of iron status in Terric Histosols

67%
Matyka-Sarzynska D., Sokolowska Z.
International Agrophysics
|
2002
|
tom 16
|
nr 2
14
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Humus fractional composition of the selected soils in the Malopolska Province

67%
Kopec M., Gondek K.
Acta Agrophysica
|
2001
|
tom 50
Twenty different soils were investigated. The soils varied in their acidification degree, granulometric composition and a carbon content. The investigated soils were collected from arable land, meadows and forests. Humic compounds were extracted from the soil according to the Konowowa and Bielczikova's method. Very high quantitative and qualitative differentiation\was observed. It was related to the soil type and utilisation system. Low but differentiated quantities of humic compounds extracted by 0.05 M H2SO4 were found in the samples of the analysed soils. In the extract of pyrophosphate and sodium base as well as in the extract of sodium base, there were more fulvic acids than humic acids which was reflected in the narrow Ckh:Ckf ratio, particularly in the forest soils. In addition very high proportion of non-hydrolysing carbon was observed. Its content ranged from 52 to 84%. The highest proportion of this fraction was found in the soils agriculturally utilised.
15

The complexing capacities of humic substances isolated from Baltic sediments and their molecular weight fraction towards copper [II] and iron [III]

67%
Pempkowiak J., Szponar Z.
Oceanologia
|
1993
|
tom 34
16

Selected properties of different molecular size fractions of humic substances isolated from surface Baltic water in the Gdansk Deep area

59%
Grzybowski W.
Oceanologia
|
1996
|
tom 38
|
nr 1
17
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Ocena zawartosci utlenialnej frakcji wegla w glebach torfowo-murszowych o roznym stopniu wtornych przeobrazen

51%
Matyka-Sarzynska D., Sokolowska Z.
Acta Agrophysica
|
2000
|
tom 38
149-156
Badania przeprowadzono na 14 murszach o różnym stopniu wtórnych przeobrażeń. Dla każdej gleby określono ilość węgla ulegającego w ciągu 2 godzin utlenieniu 0,005 M roztworem KMnO4 o PH= 2,5. Generalnie obserwuje się wpływ stopnia wtórnego przeobrażenia na zawartość podatnej na utlenianie substancji organicznej, zwłaszcza dla utworów silnie i bardzo silnie wtórnie przeobrażonych. Ponadto otrzymane wyniki przeanalizowano uwzględniając zawartości kwasów fulwowych i huminowych w badanych murszach. Dla gleb o współczynniku W1>0.60 wraz ze wzrostem udziału w glebie kwasów fulwowych rośnie zawartość frakcji węgla utlenialnej KMnO4.
18

Wplyw borowiny naturalnej i roztworu izolowanych kwasow huminowych na niektore wskazniki przemiany materii i rownowagi kwasowo-zasadowej u zwierzat doswiadczalnych

34%
Banaszkiewicz W., Drobnik M.
Roczniki Państwowego Zakładu Higieny
|
1994
|
tom 45
|
nr 4
353-360
W badaniach doświadczalnych na szczurach, prześledzono wpływ wodnego homogenatu z borowiny naturalnej oraz wyizolowanych kwasów huminowych, zastosowanych w formie kuracji pitnej na wybrane parametry gospodarki: węglowodanowej, tłuszczowej białkowej, elektrolitowej oraz obraz morfologiczny i rozmaz krwi obwodowej i równowagę kwasowo-zasadową.
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