Laboratoire des Géosciences, Ressources Minérales, Energétiques, Environnement, Département de Géologie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092, Tunis, Tunisia.
Société de Promotion du Lac de Tunis, BP. No. 36, 1080, Tunis Cedex, Tunisia.
Environ Sci Pollut Res Int. 2018 Sep;25(25):25045-25059. doi: 10.1007/s11356-018-2575-0. Epub 2018 Jun 23.
Tunis's Lake North (LNT), located on the Mediterranean Sea, and Tunisia's most important lagoon due to its economic value and its strategic position within the city, has recently undergone a vast sanitation project. To study the lagoon's level of metal pollution, three sediment cores were taken and the sediments were analyzed for trace and major elements, acid volatile sulfides (AVS), total organic carbon (TOC), and minerals. Results showed that TOC concentrations (0.2-3.1%) decreased following the lagoon's restoration. In addition, in comparison to historical data, concentrations of Cu (16-69.5 μg g), Zn (60.6-191.4 μg g), and Pb (13-100.9 μg g1) also decreased. Enrichment factor calculation with respect to the crust and local background showed that the sediment had long been contaminated by human pollution and especially by Pb, Zn, and Cu. The AVS to simultaneously extracted metal (SEM) ratio revealed values generally less than 1 indicating no sediment toxicity risks. Statistics revealed a detrital origin for certain metals and a diagenetic origin for FeS and carbonate minerals.
突尼斯的北部泻湖（LNT）位于地中海，是突尼斯最重要的泻湖，由于其经济价值和在城市中的战略地位，该泻湖最近进行了一项大规模的卫生项目。为了研究泻湖的金属污染水平，采集了三个沉积物岩芯，并对痕量和主要元素、酸可挥发性硫化物（AVS）、总有机碳（TOC）和矿物质进行了分析。结果表明，TOC 浓度（0.2-3.1%）在泻湖修复后下降。此外，与历史数据相比，Cu（16-69.5μg/g）、Zn（60.6-191.4μg/g）和 Pb（13-100.9μg/g）的浓度也有所降低。与地壳和当地背景的富集因子计算表明，沉积物长期受到人为污染的影响，特别是受到 Pb、Zn 和 Cu 的污染。同时提取金属的 AVS（SEM）比值表明，该比值通常小于 1，表明没有沉积物毒性风险。统计数据显示，某些金属具有碎屑来源，而 FeS 和碳酸盐矿物具有成岩来源。
