Naslov
Rječina River Sediments (Croatia) from Captured Spring to Polluted Prodelta

Autori
Frančišković-Bilinski, Stanislav ; Juračić, Mladen ; Tibljaš, Darko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Prirodoslovna istraživanja riječkog područja. II. znanstveni skup s međunarodnim sudjelovanjem. Knjiga sažetaka / Arko-Pijevac, Milvana ; Kružić, Borut ; Kovačić, Marcelo - Rijeka : Prirodoslovni muzej Rijeka, 2006, 55-56

Skup
Prirodoslovna istraživanja riječkog područja. II. znanstveni skup s međunarodnim sudjelovanjem

Mjesto i datum
Rijeka, Hrvatska, 14.06.2006. - 17.06.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Rječina river; prodelta; sediments; mineral composition; chemical composition; pollution

Sažetak
Surface sediments (fraction <63 &#956; m) from source to the mouth prodelta of Rječina River (Croatia short karst alogene river (18.3 km), which is an important source of drinking water were studied to investigate changes in their mineral (by XRD) and chemical (by ICP-MS) composition in order to illustrate an anthropogenic influence at the lower course due to paper industry and mills, and in prodelta from untreated municipal sewage and large harbor of town Rijeka. In all analysed sediment samples and in the source rock quartz is a major mineral, while feldspar and mica group minerals are less abundant. Chlorite is a minor or trace mineral in all samples. Calcite and dolomite are abundant in the river prodelta, reflecting changes in bedrock lithology from flysch to carbonates. Among major elements Fe is the most abundant element in river sediments, and Ca in prodelta sediments. Concentrations of Al, Mn, Ni, Cr, Co, La and Nd decrease donstream, while Mg, S, Na, B, Pb, Zn, As, Sn, U, Mo, Hg and Ag accumulate in prodelta sediments. The results are compared with sediments of Rižana and Dragonja Rivers, which is used for drinking water supply of the southwest Slovenia, also with polluted sediments of Idrijca and Soča Rivers (Slovenia). Among the studied elements, As is present in all sediments at concentrations >6 ppm, that cause lowest toxic effects, at the lower Rječina and in prodelta Pb is present at concentrations >31 ppm, that could cause lowest toxic effects. Concentrations of Zn in prodelta, correspond to those occurring in moderately polluted sediments (90-200 ppm). In the prodelta Hg is slightly below toxicity threshold (1 ppm), while Ag is present at toxicity thershold (0.5 ppm) or close to it.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

Napomena
Zbornik je objavljen dvojezično - na hrvatskom i na engleskom jeziku

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