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Accumulation rate of polychlorinated biphenyls [PCBs] in dandelion [Taraxacum officinale] in the conditions of soil contamination with oil derivatives

100%

Malawska M., Wilkomirski B.

Roczniki Państwowego Zakładu Higieny

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2001

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tom 52

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nr 4

The study concerned PCB accumulation in soil at two depths (S1: 0-20 cm, S2: 20- 40 cm) and in Taraxacum officinale plants. It was carried out within railway junctions and near railway lines. Various degrees of PCB contamination were detected in soil and parts of plants above the ground level. PCB content in most soil samples was between 100 and 250 ng/g, while in plants it varied from 100 to 800 ng/g. An analysis of the distribution of different groups of PCB congeners in plant and soil material has revealed that the content of hepta-CB and hexa-CB fractions was the highest of all PCBs for both soil depths, as well as for plants. No significant differences were found for the degree of various PCB congener group penetration into the soil, neither in railway junction areas, nor in the vicinity of railway tracks. Statistical test of pair comparison, performed in order to establish the rate at which plants accumulate different groups of PCB congeners has revealed significant differences in accumulation rates for the following pairs: penta-chlorinated congeners are accumulated at a higher rate than tetra-chlorinated ones and hexa-chlorinated congeners are accumulated at a higher rate than penta-chlorinated ones. This phenomenon occurs in the area of railway junctions (areas heavily polluted with oil derivatives). It was found that in the area of railway lines (areas with low levels of pollution) hexa-chlorinated congeners were accumulated at a higher rate than tetra- and penta-chlorinated ones. No significant differences were found for other pairs of PCB congeners. The use of dandelion as a bioindicator of environmental pollution with PCB congeners seems to be a good and reliable source of information about the emission of those substances into the natural environment.

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Competition between spring wheat and spring barley under conditions of diversified fertilisation. Part II. Influence on biomass of plants and rate of its accumulation

84%

Treder K., Wanic M., Nowicki J.

Acta Agrophysica

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2008

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tom 11

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nr 3[158]

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Recent changes in sediment accumulation rates in Adventfjorden, Svalbard

84%

Zajaczkowski M., Szczucinski W., Bojanowski R.

Oceanologia

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2004

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tom 46

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nr 2

Recent sediment accumulation rates in Adventfjorden (Svalbard), a small subpolar fjord, were determined by 210Pb and 137Cs dating. Modern rates in the central basin decrease downfjord from 1.87 to 0.87 cm y−1 (2.6 to 1.19 g cm−2 y−1). Comparison of the modern values (1986–2001) with older ones (1963–86) reveals a marked increase in sediment accumulation rates in the last ten years. This correlates well with recent climate changes (warming and increase in precipitation). Comparison with particulate matter flux data indicates that a portion of the sediment is passed on to Isfjorden.

Ograniczanie wyników

1 Acta Agrophysica

1 Oceanologia

1 Roczniki Państwowego Zakładu Higieny

1 Bojanowski R.

1 Malawska M.

1 Nowicki J.

1 Szczucinski W.

1 Treder K.

1 Wanic M.

1 Wilkomirski B.

1 Zajaczkowski M.

1 2008

1 2004

1 2001

Accumulation rate of polychlorinated biphenyls [PCBs] in dandelion [Taraxacum officinale] in the conditions of soil contamination with oil derivatives

Competition between spring wheat and spring barley under conditions of diversified fertilisation. Part II. Influence on biomass of plants and rate of its accumulation

Recent changes in sediment accumulation rates in Adventfjorden, Svalbard