Geochemistry and speciation of metals in sediments of the Maharlu Saline Lake,Shiraz, SW Iran |
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| Authors: | Giti Forghani Farid Moore Sanghoon Lee Afshin Qishlaqi |
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| Institution: | (1) Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz, Iran;(2) Environmental Engineering Section, Division of Biotechnology, The Catholic University of Korea, Buchon, 420-743, Korea; |
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| Abstract: | In this study, the total concentration and speciation of trace elements (As, Cr, Cu, Cd, Pb, Zn, and Ni), in sediments of
the Maharlu saline Lake, SW Iran are investigated. Comparison with sediment quality guidelines, calculation of the enrichment
factors, and trace metal profiles in the Khoshk River inflow point indicate that Maharlu Lake is in the threat of contamination,
especially with respect to Ni and Cd. Sequential extraction analysis reveals that elemental speciation in this lake is strongly
affected by oxidizing condition of the lake water. The studied elements (except Cr) are mainly associated with oxide phases,
as a result of prevailing oxidizing conditions of the lake and also probably due to the source of elements. The ratio of metals
in mobile fractions to sum of fractions in lake sediments is very low. However, metal ratios (except for Cr) in mobile fractions
are much higher in surface sediments, indicating the impact of anthropogenic loading of trace metals in the recent years. |
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