PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 5

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Temporal changes in Hg, Pb, Cd and Zn environmental concentrations in the southern Baltic Sea sediments dated with210Pb method
Zalewska T., Woroń J., Danowska B., Suplińska M.
Oceanologia
|
2015
|
No. 57 (1)
32--43
EN
The article presents data on heavy metal – Hg, Pb, Cd and Zn – distribution in the layers of marine sediments from the off-shore areas of the southern Baltic Sea: Gdańsk Deep, SE Gotland Basin and Bornholm Deep. Depth profiles of metal concentrations were converted to time-based profiles using the 210Pb dating method and verified by 137Cs distribution in the vertical profile. The linear sedimentation rates in the Gdańsk Deep and SE Gotland Basin are similar, 0.18 cm yr-1 and 0.14 cm yr-1, respectively, while the region of the Bornholm Deep is characterized by a greater sedimentation rate: 0.31 cm yr-1. Regarding anthropogenic pressure, Gdańsk Deep receives the largest share among the analyzed regions. The maximal metal concentrations detected in this area were Zn – 230 mg kg-1, Pb – 77 mg kg-1, Cd – 2.04 mg kg-1 and Hg – 0.27 mg kg-1. The least impact of anthropogenic pressure was noticeable in SE Gotland Basin. The combination of sediment dating with the analysis of vertical distribution of heavy metals in sediments benefited in the determination of target metal concentrations used in environmental status assessments. Reference values of heavy metal concentrations in marine sediments were determined as: Zn – 110 mg kg-1, Pb – 30 mg kg-1, Cd – 0.3 mg kg-1 and Hg – 0.05 mg kg-1 from the period of minor anthropogenic pressure. Basing on the determined indices: enrichment factor (EF), geoaccumulation indicator (Igeo) and contamination factor (CF) the status of marine environment was assessed regarding the pollution with heavy metals.
2
Content available remote Anthropogenic radionuclides 137Cs and 90Sr in the southern Baltic Sea ecosystem
Zalewska T., Suplińska M.
Oceanologia
|
2013
|
No. 55 (3)
485--517
EN
The radioisotopes of caesium (137Cs) and strontium (90Sr) make the greatest contribution to the radioactivity level due to artificial radionuclides in the Baltic Sea, where the level of 137Cs contamination is higher than in any other part of the world ocean. The main sources of man-made radionuclides are the Chernobyl accident in 1986 and the nuclear weapons tests carried out in the 1950s and 1960s. This study discusses the distribution patterns and trends in activity concentrations of 137Cs and 90Sr recorded in various compartments of the marine environment of the southern Baltic Sea. It is based on an investigation of radioactive substances as part of the Polish National Environmental Monitoring Programme. In 2010 the average concentration of 137Cs in the southern Baltic was 35 Bq m-3, while the level of 90Sr in these waters has remained at much the same level in recent years (ca 8 Bq m-3). The distribution of isotopes in the bottom sediments reflect historical events that can be identified in sediment profiles. The activity concentrations of the caesium isotope are the highest in sediments from the Gulf of Gdansk, whereas the least polluted sediments are found in the Bornholm Basin, in the western part of the southern Baltic. The highest concentrations of 137Cs in benthic plants were measured in the red alga Polysiphonia fucoides: 22.3 Bq kg -1 d.w. in June and 40.4 Bq kg-1 in September. These levels were much higher than those found in the bivalve Mytilus trossulus (7.3 Bqkg-1 d.w.). 137Cs concentrations in fish have decreased in time, reflecting the trends recorded in seawater. In 2010 the respective 137Cs activities in Clupea harengus, Platichthys flesus and Gadus morhua were 4.7, 4.9 and 6.6 Bq kg-1w.w.
3
Content available remote Reference organisms for assessing the impact of ionizing radiation on the environment of the southern Baltic Sea
Zalewska T., Suplińska M.
Oceanological and Hydrobiological Studies
|
2012
|
Vol. 41, No. 4
1-7
EN
Assessing the impact of ionizing radiation on the marine environment requires a well-defined methodology, which includes, among other elements, the analysis of exposure and effects. One of the most important components of the assessment system is the choice of reference organisms specific for the assessed area that fulfill requirements such as radioecological sensitivity, widespread distribution, and amenability to research and monitoring. The following species specific to the southern Baltic Sea that represent diversified ecological niches were proposed as reference organisms. Polysiphonia fucoides was proposed as a representative of macroalgae. Pelagic and benthic fauna were represented by Crangon crangon (crustacean), Saduria entomon (crustacean), Hediste diversicolor (polychaete), and Mytilus trossulus (mollusc). Fish were represented by Clupea harengus (pelagic planctotrophic fish), Gadus morhua (pelagic carnivorous fish), and Platichthys flesus (benthic fish). Activity concentrations of 137Cs were determined in reference biota as well as in seawater, as required for the total dose-rate evaluation, and relevant concentration factors were calculated.
4
Content available Vertical distribution of 137Cs, 210Pb, 226Ra and 239,240Pu in bottom sediments from the Southern Baltic Sea in the years 1998-2000
Suplińska M.
Nukleonika
|
2002
|
Vol. 47, nr 2
45-52
EN
This paper presents vertical distribution of 137Cs, 226Ra and 239,240Pu in bottom sediments collected from the Southern Baltic Sea in the years 1998-2000. In the southern part of Baltic Sea the highest concentrations of 137Cs and 239,240Pu were observed at the Gulf of Gdansk. Deposition of 137Cs ranged from 1990š402 Bq m-2 in the Bornholm Basin to 3260š820 Bq m-2 in the Gulf of Gdansk. Depositions of 239,240Pu in the Bornholm Basin were 28.1-30.4 Bq m-2 and in Gulf of Gdansk 162-174 Bq m-2. The concentration peaks of long-lived radionuclides, owing to the sedimentation processes, show the maximum fallout period in different sediment layers. The observed differences in distribution of radiocaesium and plutonium along the profile confirm two main sources of contamination - Chernobyl fallout for 137Cs and global fallout in case of 239,240Pu. In chosen core samples from the Gdansk Basin vertical distribution of 210Pb concentrations were determined. Evaluated sedimentation rates based on decrease of unsupported 210Pb ranged in the Gdansk Basin from 1.9 to 2.3 mm year-1. Calculations based on 239,240Pu peaks show sedimentation rate, in the range from 1.6-2.2 mm year-1 for P110 region.
5
Content available remote Monitoring skażeń promieniotwórczych w wybranych składnikach ekosystemu Bałtyku południowego
Grzybowska D., Suplińska M.
Postępy Techniki Jądrowej
|
2000
|
vol. 43, z. 3
35-44
PL
W prezentowanym artykule autorki przedstawiają wynika badan prowadzone nad skażeniem promieniotwórczym w osadach dennych Bałtyku południowego.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.