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Ann Acad Med Stetin, 2004; 50, Suppl. 1, 54-57

MARIA JEZIERSKA-MADZIAR, PIOTR PIŃSKWAR*, JANUSZ GOLSKI

SEASONAL FLUCTUATIONS IN FLUORIDE CONTENT IN WATERS
OF THE WARTA OXBOW LAKE IN LUBOŃ

Katedra Rybactwa Śródlądowego i Akwakultury Akademii Rolniczej w Poznaniu
ul. Wojska Polskiego 71c, 60-625 Poznań
Kierownik: prof. dr hab. Antoni Przybył
* Zakład Badań Środowiska Rolniczego i Leśnego Polskiej Akademii Nauk w Poznaniu
ul. Bukowska 19, 60-809 Poznań
Kierownik: prof. dr hab. Andrzej Kędziora

Summary
Studies were carried out in 2002–2003 at the Department of Inland Fishing and Aquaculture, Agricultural University of Poznań, on seasonal fluctuations in fluoride content in waters of the Warta oxbow lake in Luboń (52°19’ N, 16°53’ E). This reservoir has been loaded during several decades with fluorine compounds originating from the deposits of post-crystallization lye of aluminum fluoride and fluorosilicic acid. The greatest amounts of fluorine compounds were deposited in the bottom sediments in the deepest part of the reservoir. On the basis of these two-year observations it was concluded that the concentration of fluoride in water is subject to signi.cant variations (between 1.0 and 6.2 mg F–/L). The lowest fluoride concentration in water was recorded during vernal circulation. On the other hand, the highest values were found in the bottom water layer during the summer stagnation. Seasonal fluctuations in fluoride content in waters of the Warta oxbow lake were closely connected with mineralization in the bottom sediment as revealed by oxygen deficiencies in the bottom water layer.

K e y w o r d s: oxbow lakes – fluoride – water quality.

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