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Ultima descărcare din IBN: 2023-12-07 13:11 |
Căutarea după subiecte similare conform CZU |
556.5:542.3:574(498) (1) |
Hidrosfera. Apa în general. Hidrologie (450) |
Măsurarea greutății, masei. Măsurarea volumului (2) |
Ecologie generală şi biodiversitate (764) |
SM ISO690:2012 BURADA, Adrian, DESPINA, Cristina, SECELEANU-ODOR, Daniela, TIGĂNUȘ, Mihaela, SPIRIDON, Cosmin, TEODOROF, Liliana, ENE, Antoaneta. Heavy metals concentrations in Danube sediments on Romanian territory in the last 375 km. In: Environmental Challenges in the Black Sea Basin: Impact on Human Health, 23-26 septembrie 2020, Galaţi. Cluj-Napoca, România: Universitatea „Dunarea de Jos”, Galați, 2020, p. 9. ISBN 978-606-17-1691-3. |
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Environmental Challenges in the Black Sea Basin: Impact on Human Health 2020 | |||||||
Conferința "Environmental Challenges in the Black Sea Basin: Impact on Human Health" Galaţi, Romania, 23-26 septembrie 2020 | |||||||
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CZU: 556.5:542.3:574(498) | |||||||
Pag. 9-9 | |||||||
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The characteristics and the quality of Danube bottom sediments reflect human developments but, at the same time, the problems of environmental state and socio-economic situation of the river region. This paper aims to discuss the data obtained, in terms of heavy metals concentrations, from the surface sediment samples collected in 2019 from 32 sampling points situated along the Lower Danube, starting from the Calarasi-Silistra sector (km 375) until the Danube ends, through its 3 distributaries, into the Black Sea. The sediment samples were first subjected to a wet digestion technique and then analyzed by inductively coupled plasma mass spectrometry (ICP MS). The concentration values of Cd, Cr, Cu, Mn, Ni, Pb and Zn were reported to the quality limits for sediments of MMGA Order 161/2006 which establish the ecological status of the water bodies. The results indicate that these pollutants generally depend on many interrelated factors from natural background (geological substrate rich in mineralization) to the pollution processes (uses of chemicals in industrialization, agriculture, urbanization). The presence of metals in sediments is often caused by the processes of transport and erosion, but is also related to the remobilization phenomena, sediments representing a source of a secondary contamination with heavy metals. |
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