| Author/Editor | Jeran, Zvonka; Jaćimović, Radojko; Vreča, Polona; Brancelj, Anton | |
| Title | Distribution of metals and trace elements in sediments of three Alpine lakes | |
| Translated title | Kovine in elementi v sledovih v sedimentih treh visokogorskih jezer | |
| Type | članek | |
| Source | Geologija | |
| Vol. and No. | Letnik 45, št. 2 | |
| Publication year | 2002 | |
| Volume | str. 407-12 | |
| Language | eng | |
| Abstract | In three Alpine lakes (Jezero na Planini pri Jezeru, Krnsko jezero and in Jezero v Ledvicah) the distribution of some metals and trace elements was determined in sediment cores using multielemental instrumental neutron activation analysis. Sediments were analysed to depths of 32 cm, 19 cm and 16 cm, respectively. Dating of sediments was done on the basis of 210Pb measurements. It was found that the levels of rare earth elements and some other lithophilic elements such as Sc, Cr, Th and U in Krnsko jezero were significantly lower than those found in the other two investigated lakes. In all three lakes changes with depth were noticed for practically all anthropogenic elements, namely As, Br, Cd, Hg, Mo and Zn. Three periods of lake history can be distinguished which reflect industrial activities in the 19th and 20th century In the sediment profile of lake Krnsko jezero three well expressed lows of all investigated elements were found at depths of 3-3.5 cm, 6-6.5 cm and 8 cm which can be linked to two earthquakes in 1976 and 1942 and the First World War. The influence of earthquakes on the distribution of trace elements in the other two lakes was less evident. | |
| Summary | V globinskih profilih talnega sedimenta smo v treh izbranih visokogorskih alpskih jezerih: Jezero na Planini pri Jezeru, v Krnskem jezeru in Jezeru v Ledvicah z uporabo multielementne instrumentalne nevtronske aktivacijske metode (k0-INAA) določili več kot 30 kovin in drugih elementov v sledovih. Analizirali smo sedimente do globine 16 cm (Jezero v Ledvicah), 19 cm (Krnsko jezero) in 32 cm (Jezero na Planini pri Jezeru). Z meritvami radioaktivnega Pb (Pb-210) smo določili starost sedimentov. Ugotovili smo, da se glede na koncentracije prvin redkih zemelj in nekaterih drugih litofilnih elementov, predvsem Sc, Cr, Th in U, Krnsko jezero bistveno razlikuje od ostalih dveh jezer. Poleg tega smo ugotovili, da se v vseh treh jezerih koncentracije praktično vseh kovin in elementov v sledovih spreminjajo z globino in da pri tako imenovanih antropogenih elementih, kot so As, Br, Cd, Co, Cr, Hg, Mo, Sb in Zn, lahko ločimo tri obdobja jezerske zgodovine, ki so vezana na povečano industrializacijo v 19. in v sredini 20. stoletja. Predvsem v Krnskem jezeru smo opazili tri izrazite depresije pri 3-3,5 cm, 6-6,5 cm in 8 cm. Prvi dve depresiji lahko glede na ocenjeno starost sedimentov povežemo s potresoma leta 1976 in 1942, tretjo pa s prvo svetovno vojno. Vpliv potresov na porazdelitev elementov v profilih sedimentov ostalih dveh jezer je nekoliko manj izrazit. | |
| Descriptors | METALS TRACE ELEMENTS GEOLOGIC SEDIMENTS WATER POLLUTION, CHEMICAL FRESH WATER NEUTRON ACTIVATION ANALYSIS SLOVENIA |