DBPapers
DOI: 10.5593/sgem2017/11/S01.011

CHEMICAL COMPOSITION OF THE SURFACE LAYER OF BOTTOM SEDIMENTS IN THE NORTHERN PART OF THE CHOTT EL JERID PERIODIC LAKE IN TUNISIA

R. Machowski, M. Rzetala, M. Rzetala
Saturday 9 September 2017 by Libadmin2017

References: 17th International Multidisciplinary Scientific GeoConference SGEM 2017, www.sgem.org, SGEM2017 Conference Proceedings, ISBN 978-619-7105-98-8 / ISSN 1314-2704, 29 June - 5 July, 2017, Vol. 17, Issue 11, 89-96 pp, DOI: 10.5593/sgem2017/11/S01.011

ABSTRACT

Situated in the central part of the country, Chott El Jerid is the largest periodic lake in Tunisia. The depression is a flat plain lined with Holocene lacustrine sediments, which mostly developed in the form of alluvia and evaporites. Geochemical properties of sediments were tested using the following methods: FUS-ICP, TD-ICP, INAA, Cold Vapour FIMS. As concerns the basic composition, the following substances were identified (average levels): loss on ignition (LOI) – 24.27%, SiO2 – 21.46%, CaO – 20.54%, Na2O – 5.23%, Al2O3 – 4.09%, MgO – 3.52%, Fe2O3 – 1.71%, K2O – 1.47%, TiO2 – 0.28%, P2O5 – 0.09%, MnO – 0.02%. The average sulphur content determined was 8.41%. The average content of trace elements was: 4.0 mg/kg As, 162.0 mg/kg – Ba, 61.5 mg/kg – Br, 25.0 mg/kg – Ce, 7.0 mg/kg – Co, 27.5 mg/kg – Cr, 1.25 mg/kg Cs, 8.0 mg/kg – Cu, 0.55 mg/kg – Eu, 3.8 mg/kg – Hf, 13.05 mg/kg – La, 0.18 mg/kg – Lu, 2.5 mg/kg Mo, 9.0 mg/kg Nd, 10.0 mg/kg – Ni, 9.0 mg/kg – Pb, 55.0 mg/kg Rb, 0.6 mg/kg – Sb, 3.8 mg/kg – Sc, 2.15 mg/kg – Sm, 1616.5 mg/kg – Sr, 4.1 mg/kg – Th, 1.45 mg/kg U, 31.0 mg/kg – V, 11.0 mg/kg – Y, 1.15 mg/kg – Yb, 24.5 mg/kg – Zn, 151.5 mg/kg – Zr. The content of basic components and concentrations of trace elements are good indicators of the quality of bottom sediments in periodic lakes.

Keywords: bottom sediments, trace elements, lake, geoecology, geochemistry.

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