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1

Phosphate desorption from sediments in the Pomeranian Bay (Southern Baltic)

100%
Frankowski L., Bolalek J.
Oceanological Studies
|
1997
|
vol. 26
|
issue 1
205-214
EN
The paper discusses phosphate exchange across the sediment-water interface in the Pomeranian Bay in March 1996. The following parameters were additionally determined in the sediment cores sampled: humidity, ignition loss, organic carbon and organic nitrogen contents, content of phos-phorus inorganic forms (bound to calcium, aluminium and iron) and phosphate concentrations in interstitial waters, this last being measured at three sampling stations. The results indicate that a relationship exists between phosphate desorption and each of the above parameters, including the nature of the sediment. The sorption capacity was also found to be related to the location of the sediment sampling sites (distance from the mouth of the river Owina). At six stations phosphate fluxes from the sediment to water (obtained in a laboratory chamber experiment) ranged from 27 to 417 mmol?m-2?day-1. Phosphate concentrations in the near-bottom water were increasing during the incubation time.
2

Oxidation-reduction conditions in the bottom sediments of Puck Bay

100%
Bolalek J., Kowalewska M.
Oceanological Studies
|
1997
|
vol. 26
|
issue 2-3
117-126
EN
Chloride, phosphate, sulphate, ammonia, hydrogen carbonate concentrations, the redox potential Eh and the pH of bottom sediments were determined. The spatial distribution and profiles of selected species are presented. These parameters showed great variability (e.g. potential redox values ranged from -358 to 223 mV), which depended mainly on the penetration of underground waters and station location, and but only to an insignificant extent on the bottom type. Higher redox potentials were recorded for samples with low PO43-, NH4+, HCO3- and Cl- concentrations and with high SO42- concentrations. The relationship between redox potential and the concentration of species originating from the oxidation of organic matter, e.g. PO43-, NH4+ and HCO3-, was found.
3

Distribution of the Fe (II) and Fe (III) dissolved in the interstitial water of the Gulf of Gdansk

81%
Bialkowska I., Bolalek B. J., Bolalek J.
Oceanological Studies
|
2000
|
vol. 29
|
issue 4
43-54
EN
A sediment environment of the Gulf of Gdansk is reductive to the iron (III). The iron (II) is a dominant form of this element in the interstitial water, and a total reduction takes place in a sediment layer of up to 20 cm. A speciation of a dissolved iron as well as a total iron concentration is related to types of sediments in a measuring point. It could also be noted that a concentration of each iron form in the above-bottom water layer is much lower than in the interstitial water of the top sediment layer. To illustrate redox conditions in the environment a ratio Fe(III) : Fe(II) was introduced. In the waters, the iron (III) dominates and the Fe(III) : Fe(II) ratio is much higher than the relevant value in the interstitial water.
4

Interdependence between phosphorus forms in sediments and iron in interstitial waters in the Gulf of Gdansk

81%
Matuszewska K., Bialkowska I., Bolalek J.
Oceanological and Hydrobiological Studies
|
2003
|
issue 1
5-14
EN
The content of various phosphorus forms in sediments and the content of iron in interstitial waters were measured in sediment samples collected in the Gulf of Gdansk in March 2001. The studies showed that the greatest amounts of the total phosphorus and total dissolved iron were present in the uppermost sediment layer, and their respective concentrations ranged from 203,99 mumol?g-1d.w. to 1894,02 mumol?g-1d.w., and from 0,02 mumol?dm-3 to 4,68 mumol?dm-3. The contents of these parameters were directly connected with the type of sediment - the greatest concentrations were measured in fine sediments. The analysis of multiple correlation coefficients demonstrated that in over 90% of cases the concentration of phosphorus bound with iron depended on: the sediment type and its humidity, the content of organic matter, and the concentration of the total iron dissolved in the interstitial waters.
5

Short-term fluctuations in dissolved silicate concentrations in the Gdansk Deep

81%
Burska D., Falkowska L., Bolalek J.
|
EN
Diurnal fluctuations in dissolved silicate in the water column are discussed. The effect of temperature, salinity, depth and the time of day on silicate concentration was studied during the spring phytoplankton bloom. Maximum concentrations of silicate were recorded at night, minimal levels at noon and in the afternoon. Silicate was depleted down to a depth of 30 m. The sporadically recorded minimal silicate concentrations (0.07 - 0.28 *mol*dm-3) could have limited primary production. This observation is substantiated by the below-optimum Si:N and Si:P molar ratios in the euphotic layer. Silicate concentrations increased with depth, the maximum (30 - 60 *mol*dm-3) being measured in the near-bottom water. The pycnocline formed a barrier controlling silicate diffusion from the near-bottom water to the surface layer. Diurnal silicate fluctuations are also discussed with respect to biological processes.
6

Investigating the source of hydrogen sulphide in sediments of the Puck Bay in the vicinity of Hel port

81%
Bolalek J., Jankowska H., Leczynski L., Falkowska L.
|
EN
The paper presents results of analytical investigation on possible sources of hydrogen sulphide occuring in seawater supplied to marine laboratories of the Marine Station of Gdansk University in Hel.Seawater is pumped to aquaria system from the Puck Bay.Hydrogen sulphide concentration in pumped water was about o.25 mmol/ml, while in sediments surrounding the water intake it reached 2.64 mmol/ml.It turned out that hydrogen sulphide was produced in sediments by sulphste reducing bacterai from anthropogenic wastes.
7

Temporal variations in phosphorus species in the surface layer of bottom sediments from the Gulf of Gdansk - preliminary research

81%
Graca B., Bolalek B. J., Bolalek J.
|
EN
Temporal variations in phosphorus species [total phosphorus (Ptot), organic phosphorus (Porg), total inorganic phosphorus (Pmin), phosphorus bound to calcium (PCa), aluminium (PAl) and iron (PFe)] were studied in the surface layer of bottom sediments from the Gulf of Gda?sk. These changes were caused mainly by variability in Porg, PAl and PFe concentrations and were closely related to the growth cycle in the basin. The phosphorus concentration was higher in the spring and summer (April - September) that in the autumn and winter (November-March). For much of the year concentrations of Pmin were higher than those of organic phosphorus. The prevalent form of inorganic phosphorus was PCa, whose concentrations exceeded those of iron- and aluminium-bound phosphorus.
8

The occurrence of total and labile forms of lead and nickel in the sediments of the port of Gdansk

81%
Radke B., Dembska G., Aftanas B., Bolalek J.
|
EN
Sediment samples collected in 1997 and 1998 from the Wislane, Obroncow Poczty Polskiej or Siarkowe (Sulfur), Oliwskie and Paliw Plynnych (Liquid Fuels) quays were sorted into four grain size fractions, i.e., <2.00 mm; 2.00 - 0.063 mm; 0.063 - 0.032 mm; <0.032 mm. It was determined that the sediments in the port area are small-grained sands with a small admixture of silt. The analyzed benthic sediments contained different amounts of organic matter and displayed varying water content. The mean contents of the labile form of lead and its total concentration in the grain size fraction <2.00 mm were 6.4 mg.kg ?1 d.w. and 11.4 mg.kg ?1 d.w., respectively. These values for nickel were 2.9 mg.kg ?1 d.w. for the labile form and 7.1 mg.kg ?1 d.w. for total concentration. The widest range of values was noted in the sediment surface layer (0-20 cm) for total concentration and labile forms. Sediments collected from locations close to the Gulf of Gdansk (e.g., Liquid Fuels Quay) and from areas with low industrial activity (e.g., Sulfur Quay) exhibited Pb and Ni concentrations which were many times lower than those in other areas of the port which were investigated.
9

Pathways and determinations of organometallic compounds in the marine environment with a particular emphasis on organotin

81%
Radke B., Namiesnik J., Bolalek J.
Oceanological and Hydrobiological Studies
|
2003
|
issue 3
43-71
EN
Organometallic compounds are widely used in almost all sectors of industry. Some organometallic compounds are very potent toxins. Human activity releases organometallic compounds into the natural environment where they undergo various changes through compound-environment interactions. These compounds have a negative impact on living organisms. The most widespread, man-made organometallic compounds present in the natural environment are those of tin, mercury and lead.
10

Geological, geochemical and bacteriological conditions in a post- dredging pit in Puck Bay (Southern Baltic, Poland)

71%
Bolalek J., Piekarek-Jankowska H., Leczynski L., Frankowski L., Podg?rska B.
Oceanological Studies
|
1996
|
vol. 25
|
issue 3
111-122
EN
The paper presents the results of geological and geochemical studies carried out in an artificial pit which was formed after dredging the sediments up from the bottom of Puck Bay in 1991. It was found out that fine-grained classic sediments (d50 = 0.2 - 0.08 mm) as well as a great amount of organic matter (Pilayella littoralis) were deposited in the pit. The proc-esses of organic matter mineralization brought about reducing conditions. Ammonia concen-trations in near-bottom waters were higher than in the areas surrounding the pit 191.0 mmol?dm-3 compared to 3.97 mmol?dm-3. Phosphate concentrations in the waters and sedi-ments were elevated and reached values up to 1 mmol?dm-3. Intensive processes of organic matter mineralization caused both the temporary decline in sulphate concentration in near-bottom waters down to the value of 272 mg?dm3 (almost twice lower than the average concen-tration in Puck Bay waters) as well as sulphate deficiency in interstitial water. Below the 5 - metre isobath, the concentration of hydrogen sulphide varied between 0.11 and 0.49 mmol?kg-1w.w. The total number of bacteria in 1 cm3 of near-bottom water amounted to 107 and the number of sulphate-reducing bacteria ranged from 240-46000. The number of sulphate-reducing bacteria in 1 g d.w. of surface bottom sediments was estimated as 104 to 106.
11

Nutrients and oxygen in the Gulf of Gdansk

70%
Falkowska L., Bolalek J., Nowacki J.
Oceanological Studies
|
1993
|
issue 64/3
131-162
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