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izvor podataka: crosbi

Shell layers of Ostrea edulis as an environmental indicator of TBT pollution: the contribution of surface techniques (CROSBI ID 518428)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Medaković, Davorin ; Traverso, Pierluigi ; Bottino, Carlo ; Popović, Stanko Shell layers of Ostrea edulis as an environmental indicator of TBT pollution: the contribution of surface techniques // European Conference on Applications of Surface and Interface Analysis / Werner, Wolfgang S.M. (ur.). Beč: Vienna University of Technology, 2005. str. 159-159-x

Podaci o odgovornosti

Medaković, Davorin ; Traverso, Pierluigi ; Bottino, Carlo ; Popović, Stanko

engleski

Shell layers of Ostrea edulis as an environmental indicator of TBT pollution: the contribution of surface techniques

Biomineralization is a complex combination of biochemical and physiological processes, depending on the endogenous activity of the organism and exogenous environmental influence. Although mollusc shells are considered to be a powerful tool for monitoring environmental conditions, alterations in biomineralization processes influenced by environmental changes have been insufficiently investigated so far. X-Ray powder Diffraction (XRD) was used to study the mineral composition of the shells of the European flat oyster Ostrea edulis (Linnaeus), collected from two localities in the East Adriatic Sea (Croatia). The variability of shell element chemistry between two different shell layers were determined by X-Ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscopy (SEM). XRD showed that the dominant component of outer prismatic foliated shell layer is calcite with traces of aragonite and halite. The chambers of the inner nacreous shell layers are built mainly of magnesium calcite. Chemical element analysis given by XPS and SEM confirmed that beside carbonates other minor elements could be incorporated in the oyster shells. The silicon (Si) is ranging from 0, 1 to almost 1, 5 atomic % (A %) in the outer shell layers whereas its amount becomes lower and difficult to quantify in the inner shell layers. On the contrary, tin (Sn) is clearly detected only in the chambers of the newly formed inner nacreous layer, in a concentration that can be estimated, according with both XPS and SEM analysis, in the order of 0.1-0.2 A %. Tin in the oyster shells is environmentaly induced. A possible formation mechanism and specific ecological factor that could influence the precipitation of tin in the different shell layers of O. edulis is discussed.

XRD; XPS; SEM; Tin; Silica; Chamber; Oyster

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Podaci o prilogu

159-159-x.

2005.

objavljeno

Podaci o matičnoj publikaciji

European Conference on Applications of Surface and Interface Analysis

Werner, Wolfgang S.M.

Beč: Vienna University of Technology

Podaci o skupu

11 th European Conference on Applications of Surface and Interface Analysis

poster

25.09.2005-30.09.2005

Beč, Austrija

Povezanost rada

Fizika, Geologija, Biologija