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Bioaccumulation of gamma emitting radionuclides in Polysiphonia fucoides.

Zalewska T - J Radioanal Nucl Chem (2013)

Bottom Line: The article presents the results of a study on the bioaccumulation abilities of Polysiphonia fucoides, a red algae specific to the southern Baltic Sea, towards (of) gamma emitting isotopes.Having reached the maximal concentration level, a statistically significant decline in radioactivity concentrations of the five isotopes in the plant tissue was observed.A half-life of biological removal of the isotopes from the plant tissue was established at: 3.8 days in the case of (54)Mn, 4 days-(57)Co, 4 days-(60)Co, 4.2 days-(137)Cs and (241)Am-3.5 days.

View Article: PubMed Central - PubMed

Affiliation: Institute of Meteorology and Water Management, National Research Institute, Maritime Branch in Gdynia, Waszyngtona 42, 81-342 Gdynia, Poland.

ABSTRACT

The article presents the results of a study on the bioaccumulation abilities of Polysiphonia fucoides, a red algae specific to the southern Baltic Sea, towards (of) gamma emitting isotopes. A laboratory experiment was carried out to determine changes in the activities of some isotopes-(54)Mn, (57)Co, (65)Zn, (110m)Ag,(113)Sn, (134)Cs, (137)Cs and (241)Am-occurring in P. fucoides exposed to a seawater medium containing these isotopes over the course of 1 month. All analyzed isotopes showed the greatest increase of radioactive activity in plant tissue in the first 24 h of exposure. The temporary concentration factors of cesium isotopes were increasing linearly during the experiment from 114 to 274 in the case of (137)Cs, and from 144 to 351 in the case of (134)Cs. The level of the initial concentration factor of cesium isotopes in the plant proved to be independent of the initial concentration of the isotope in seawater and it took the lowest (125 dm(3) kg(-1)) level among the studied isotopes. In the case of a mixture of gamma emitting isotopes, a linear relation between the individual isotope activity in P. fucoides and its initial concentration in seawater was established after the first day of exposure; the isotopes initial concentration factors ranged from 767 to 874 dm(3) kg(-1). Having reached the maximal concentration level, a statistically significant decline in radioactivity concentrations of the five isotopes in the plant tissue was observed. A half-life of biological removal of the isotopes from the plant tissue was established at: 3.8 days in the case of (54)Mn, 4 days-(57)Co, 4 days-(60)Co, 4.2 days-(137)Cs and (241)Am-3.5 days.

No MeSH data available.


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Relation of radionuclides activities in P. fucoides to the initial activities in seawater
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Fig4: Relation of radionuclides activities in P. fucoides to the initial activities in seawater

Mentions: The experiment on the bioaccumulation of a mixture of gamma emitting radioisotopes by P. fucoides under laboratory conditions showed a statistically significant linear relation (r = 0.977, p = 0.0003) of the activity of isotopes in the plant tissue and their initial concentration in a seawater medium after the first day of exposure (Fig. 4; Table 2). 137Cs was an exception as its activity in P. fucoides was definitely lower than would be expected from the linear relationship. At the same time the concentration of cesium in the plant tissue was increasing proportionally to the concentrations in seawater (Fig. 4). However, the efficiency of cesium bioaccumulation was nearly eight times lower at the stage than in the case of other radioisotopes, well illustrated by the low slope of the correlation curve (Fig. 4). This low bioaccumulation efficiency at the initial stage was also marked in the low values of initial concentration coefficients CF0. In the case of 137Cs, CF0 = 135 ± 7 dm3 kg−1 was slightly higher than the value obtained in 2010. However, in the experiment in 2011, the concentration coefficient determined at the equilibrium stage reached 1,547 ± 69 dm3 kg−1, i.e. it was over 100 times higher. The CF0 characterizing the remaining isotopes were varying in a relatively narrow range 862–949 dm3 kg−1 in the case of 54Mn, 57Co, 60Co, 109Cd and 110mAg (Fig. 5). 65Zn was marked for the highest CF0 = 1,125 ± 57 dm3 kg−1.Fig. 4


Bioaccumulation of gamma emitting radionuclides in Polysiphonia fucoides.

Zalewska T - J Radioanal Nucl Chem (2013)

Relation of radionuclides activities in P. fucoides to the initial activities in seawater
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4514610&req=5

Fig4: Relation of radionuclides activities in P. fucoides to the initial activities in seawater
Mentions: The experiment on the bioaccumulation of a mixture of gamma emitting radioisotopes by P. fucoides under laboratory conditions showed a statistically significant linear relation (r = 0.977, p = 0.0003) of the activity of isotopes in the plant tissue and their initial concentration in a seawater medium after the first day of exposure (Fig. 4; Table 2). 137Cs was an exception as its activity in P. fucoides was definitely lower than would be expected from the linear relationship. At the same time the concentration of cesium in the plant tissue was increasing proportionally to the concentrations in seawater (Fig. 4). However, the efficiency of cesium bioaccumulation was nearly eight times lower at the stage than in the case of other radioisotopes, well illustrated by the low slope of the correlation curve (Fig. 4). This low bioaccumulation efficiency at the initial stage was also marked in the low values of initial concentration coefficients CF0. In the case of 137Cs, CF0 = 135 ± 7 dm3 kg−1 was slightly higher than the value obtained in 2010. However, in the experiment in 2011, the concentration coefficient determined at the equilibrium stage reached 1,547 ± 69 dm3 kg−1, i.e. it was over 100 times higher. The CF0 characterizing the remaining isotopes were varying in a relatively narrow range 862–949 dm3 kg−1 in the case of 54Mn, 57Co, 60Co, 109Cd and 110mAg (Fig. 5). 65Zn was marked for the highest CF0 = 1,125 ± 57 dm3 kg−1.Fig. 4

Bottom Line: The article presents the results of a study on the bioaccumulation abilities of Polysiphonia fucoides, a red algae specific to the southern Baltic Sea, towards (of) gamma emitting isotopes.Having reached the maximal concentration level, a statistically significant decline in radioactivity concentrations of the five isotopes in the plant tissue was observed.A half-life of biological removal of the isotopes from the plant tissue was established at: 3.8 days in the case of (54)Mn, 4 days-(57)Co, 4 days-(60)Co, 4.2 days-(137)Cs and (241)Am-3.5 days.

View Article: PubMed Central - PubMed

Affiliation: Institute of Meteorology and Water Management, National Research Institute, Maritime Branch in Gdynia, Waszyngtona 42, 81-342 Gdynia, Poland.

ABSTRACT

The article presents the results of a study on the bioaccumulation abilities of Polysiphonia fucoides, a red algae specific to the southern Baltic Sea, towards (of) gamma emitting isotopes. A laboratory experiment was carried out to determine changes in the activities of some isotopes-(54)Mn, (57)Co, (65)Zn, (110m)Ag,(113)Sn, (134)Cs, (137)Cs and (241)Am-occurring in P. fucoides exposed to a seawater medium containing these isotopes over the course of 1 month. All analyzed isotopes showed the greatest increase of radioactive activity in plant tissue in the first 24 h of exposure. The temporary concentration factors of cesium isotopes were increasing linearly during the experiment from 114 to 274 in the case of (137)Cs, and from 144 to 351 in the case of (134)Cs. The level of the initial concentration factor of cesium isotopes in the plant proved to be independent of the initial concentration of the isotope in seawater and it took the lowest (125 dm(3) kg(-1)) level among the studied isotopes. In the case of a mixture of gamma emitting isotopes, a linear relation between the individual isotope activity in P. fucoides and its initial concentration in seawater was established after the first day of exposure; the isotopes initial concentration factors ranged from 767 to 874 dm(3) kg(-1). Having reached the maximal concentration level, a statistically significant decline in radioactivity concentrations of the five isotopes in the plant tissue was observed. A half-life of biological removal of the isotopes from the plant tissue was established at: 3.8 days in the case of (54)Mn, 4 days-(57)Co, 4 days-(60)Co, 4.2 days-(137)Cs and (241)Am-3.5 days.

No MeSH data available.


Related in: MedlinePlus