文章基本信息

标题：SEDIMENTS CHARACTERISTICS AND HEAVY METALS DISTRIBUTION OF A VERY SHALLOW PROTECTED COASTAL LAGOON, PROKOPOS LAGOON, MEDITERRANEAN SEA WESTERN GREECE
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作者：Dimitrios Katsaros ; Dionisios Panagiotaras ; Nikolaos Kontopoulos 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2017
卷号：26
期号：10
页码：6093-6103
语种：English
出版社：PSP Publishing
摘要：In this study we present sedimentological and geochemical parameters in order to evaluate the environmental status of an internationally protected shallow coastal lagoon, Prokopos Lagoon, Western Greece. Six gravity cores with sediment depth up to 0.70 m l were collected and analyzed for K2O, CaO, Na2O, MgO Fe2O3, MnO, Al2O3, P2O5, TOC, V, Cr, Zn, Ni, Cu, Cd, Pb. In addition the clay, sand and silt content were determined and the mean size (Mz), sorting (a), skewness (Sk) and kurtosis (KG) values were deduced. The lagoon's sediments are composed mainly of fine silt to medium sand. The clay content of the samples ranges from 0.76 % to 6.73 % and the average values of the silt and sand content are 50.20 % and 42.56 % respectively. The geochemical evaluation indicates that mainly the terrigenous input of the surrounding catchment materials controlling inter -element and grain size association. The Cr, Ni, Cu and Zn affiliated in the aluminosilicates fraction identifying their primarily detrital origin. Fe and Mn is representative of the oxides/hydroxides group and thus Cd is associated with this fraction of the sediments. The calculation of three geochemical indices (the enrichment factor - EF, contamination factor -CF and index of geo-accumulation - Igeo) were used in order to distinguish between affected and unaffected sampling sites. The EF values calculated for Cd showing significant enrichment in some sampling sites while the CF values for Cd, Cr, Cu, Pb and Zn are indicative for a low contamination. Cr and Ni exceed the Toxicity Screening Values (TSVs) and Threshold Effect Level (TEL) according to sediment quality guidelines for metals. Nevertheless, the Zn, Cd, Cu and Pb average concentration values are bellow the Toxicity Screening Values (TSVs) and the Threshold Effect Level (TEL). By contrast, Cr and Ni exceed the TSVs and TEL values in the Prokopos lagoon sediments. The study of sediment geochemical characteristics can be considered as a baseline for future monitoring in accordance to the European Union Directives and for any future engineering interventions for the lagoon environmentalmaintenance and conservation.
关键词：Geochemistry;coastal sedimentology;lagoons;pollution indices;Prokopos Greece