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

100%
Graca B., Bolalek B. J., Bolalek J.
Oceanological Studies
|
2000
|
vol. 29
|
issue 4
55-64
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.
2

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

100%
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.
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