Laboratoire des Ressources Minérales et Environnement, Département de Géologie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092, Tunis, Tunisia.
Institut des Sciences et Technologies de la Mer, Salammbô, Tunis, Tunisie.
Environ Sci Pollut Res Int. 2018 Jan;25(3):2248-2264. doi: 10.1007/s11356-017-0529-6. Epub 2017 Nov 8.
The degree of pyritization and degree of trace metal pyritization (DTMP) were investigated in sediments from Ghar El Melh Lagoon (northern Tunisia) in order to study metal deposition. A sediment core and 28 samples were thus taken in summer 2008, and metals and sulfate were analyzed in pore water/pyrite. Acid-volatile sulfide and metals were simultaneously extracted from these two fractions and the role of pyrite in the metal cycling studied. To examine pyrite presence and mineralogical form in sediments, X-ray diffraction of the washed and decarbonated sediment was performed along with scanning electron microscopy. Results showed that pyrite is present in fromboidal and euhedral forms. Thermodynamic calculation highlighted the formation of metallic sulfides and the co-precipitation of metals with iron sulfides. The DTMP increases with depth, indicating that these metals are either sequestered as sulfides or that they co-precipitate with pyrite into the deep sediment.
为了研究金属的沉积情况，对来自突尼斯北部加尔埃勒梅尔泻湖的沉积物中的黄铁矿化程度和痕量金属黄铁矿化程度（DTMP）进行了研究。因此，在 2008 年夏季采集了一个沉积物岩芯和 28 个样本，并对孔隙水/黄铁矿中的金属和硫酸盐进行了分析。从这两个部分同时提取了酸可挥发硫化物和金属，并研究了黄铁矿在金属循环中的作用。为了检查沉积物中黄铁矿的存在和矿物形式，对经洗涤和脱碳的沉积物进行了 X 射线衍射和扫描电子显微镜检查。结果表明，黄铁矿以鲕状和自形形式存在。热力学计算突出了金属硫化物的形成以及金属与铁硫化物的共沉淀。DTMP 随深度增加而增加，表明这些金属要么被硫化物固定，要么与黄铁矿一起共沉淀到深层沉积物中。
