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Wyszukujesz frazę "toxic element" wg kryterium: Wszystkie pola


Wyświetlanie 1-2 z 2
Tytuł:
Deliberations on zinc - a trace mineral or a toxic element?
Autorzy:
Strachel, R.
Zaborowska, M.
Wyszkowska, J.
Powiązania:
https://bibliotekanauki.pl/articles/961387.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
zinc
trace element
toxic element
sustainable development
toxicity
plant nutrition
microbiological activity
biochemical activity
Opis:
The paper gives a comprehensive insight into the role of zinc in the biosphere. It reviews numerous functions of this metal at various levels of the organisation of ecosystems. An attempt has ben made to assess its importance as a microelement, while not neglecting its toxicity due to excessive accumulation of zinc in the environment. Zinc is a natural component of the Earth's crust, but in many places it has accumulated in amounts near or above the safe levels. Currently, the use of this metal is very broad, and therefore attention should be drawn to possible consequences arising from elevated levels of zinc in the environment. Dispelling controversies surrounding heavy metals is a necessary step for gaining systematic and wider knowledge on these elements. This in turn will create an opportunity for the development of strategies and subsequent actions undertaken by everyone, from individuals to major international industrial corporations, aimed at achieving homeostasis in an environment polluted with heavy metals. Increased levels of zinc can adversely affect microbiological and biochemical processes occurring in the soil and the development of plants, which has a negative impact on the quantity and quality of crops. Therefore, low bioavailability of heavy metals, including zinc, in agricultural land is a key to the stability of ecosystems and food security.
Źródło:
Journal of Elementology; 2016, 21, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological factors helping to avoid the toxic element accumulation in livers of the lesser spotted eagle (Clanga pomarina Brehm) from Eastern Poland
Autorzy:
Kitowski, I.
Sujak, A.
Wiącek, D.
Komosa4, A.
Powiązania:
https://bibliotekanauki.pl/articles/960169.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Opis:
The lesser spotted eagle is one of the most numerous species of eagles of Eurasia given high protection priority. However, it belongs to scarsely studied birds from the above area. The livers used in this study were obtained from moribund individuals delivered to the rehabilitation centres or veterinary doctors close to the raptors’ nesting places in Eastern Poland. The aim of the study was to estimate the levels of accumulation of some toxic and essential elements in samples of livers from the lesser spotted eagle and to perform analyses of ecological factors influencing toxic element concentrations. The content of elements in the samples was determined by the method of Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). The following accumulation pattern for toxic elements was found: Pb > Cd > Hg. In respect of the concentrations of essential elements, the following pattern was observed: Fe > Mg > Zn > Cu > Mn. It was demonstrated that the elevated concentration of cadmium is usually accompanied by high levels of iron and zinc. Simultaneously, a high concentration of hepatic mercury was accompanied by high levels of selenium and iron as well. In contrast to many other species of European birds of prey, the examined livers of lesser spotted eagles showed lead concentrations not indicative of raised exposure to Pb resulting in subclinical toxicity. Concerning Se, the Se concentration exceeded 5.0 mg kg-1 in only two liver samples. The absence of game in the eagles’ diet during the breeding season and also the autumnal migration are the factors which allow lesser spotted eagles to avoid pollution from lead bullets.
Źródło:
Journal of Elementology; 2017, 22, 1
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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