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Characterization of organic matter deposited in the oriental zone from Moknine hypersaline environment, oriental tunisia

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Chinese Journal Of Geochemistry 2005年第4期24卷 345-351页

作者： Raja CHAIRI Zohra el ASMI DJelLOULI laboratoire de ressources minerales et environnement faculté des sciences de tunis 2092 univ. tunis el manar tunisie Laboratoire de Ressources Minerales et Environnement Faculté des Sciences de Tunis 2092 Univ. Tunis El Manar Tunisie

The geochemistry data show that the total organic carbon (TOC) contents are high in the surface sediments in the eastern part of the Moknine’s Sebkha. Low decreasing of organic matter (OM) with increasing depth indicates the good preservation of OM in modern sediments. “Lignite levels” inserted in the sand sequence and deposited at the edge and in the intermediate zone are considered as lithologic and organic markers. It is characterized by high TOC and poor hydrogen index (HI), indicating a higher plant origin and good preservation of OM in thin beds under anoxic condition.; In all samples low values of HI are typical for strong terrigenous input in the Sebkha. Gas chromatography (GC) of saturate fraction showed that OM in the border zone is provided from plants but in the central zone OM is a mixture of terrestrial fraction and little fraction from microalgae. The study of free lipids indicated that this environment was influenced by intense bacterial and microbial activities, as evidenced by the abundance of n-alkanes and nC-{18}-nC-{22}.

关键词：突尼斯地球化学有机物质褐煤地质条件

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Sequential extraction of heavy metals during composting of urban waste

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Chinese Journal Of Geochemistry 2008年第2期27卷 121-125页

作者： Ayari F. Chairi R. Kossai R. laboratoire Eau et environnement Institut National de Recherche Scientifique et Technique B.P. 95-2050 Hammam-lifTUNISIE laboratoire ressources minérales et environnement. faculté des sciences de tunis. 2092 univ. tunis el manar univ.rsité de tunis-IPEIT. laboratoire de Chimie de la Matière Condensée 2 rue Jawaher Lel Nehru1008Monfleury-Tunis-Tunisie

In urban waste (the first matter of compost), elements such as copper, nickel and lead may be found in metallic state (wire, pile, accumulator, etc.), which is considered as non-dependent state. The work undertaken at the laboratory of composting of the INRST in Henchir Lihoudia (tunis) showed that the produced compost does not contain any mobile metallic element and the portion related to organic fraction (bioavailable) is tiny in size. We supposed that many reactions involving decomposition and complexation from elements related to the matrix components occurred during composting. The existence and importance of this phenomenon can be evaluated by studying the evolution of metal contents in the different fractions extracted sequentially during composting process.

关键词：肥料重金属城市垃圾处理方法

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A GIS-Based DRASTIC Model for Assessing Phreatic Aquifere of Bekalta (tunisian Sahel)

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Journal of Geographic Information System 2013年第3期5卷 242-247页

作者： Asma el Hanini Ayed Added Saadi Abdeljaoued Département de Géologie Faculté des Sciences de Tunis Université de Tunis El Manar Laboratoire des Ressources Minérales et Environnement Tunis Tunisia

The phreatic aquifer of Bekalta experienced a progressive degradation of water resources over time: using increasingly important waters for irrigation and drinking water, nitrate pollution, salinization... This aquifer is of great economic importance because it is used for irrigation and domestic consumption. Vulnerability map to nitrate pollution is a necessary tool to developing management to preserve the quality of groundwater. This study utilized the Geographic Information System technique and the DRASTIC model to assess the vulnerability of groundwater resources to contamination. The Geographic Information System (GIS) technology represents the best method to solve the main problems in the vulnerability survey. Indeed is allowed for swift organisation, quantification, and interpretation of large volumes of hydrological data with computer accuracy and minimal risk of human errors. The Visio model was exported and loaded into an ESRI Geodatabase in ArcCatalog as defined by the UML model. The purpose of this geodatabase is data harmonization process within modeling groundwater vulnerability to pollution. The resulting map shows evidence for three categories of vulnerability (low, middle and high). The resultant vulnerability map showed the predominant of moderately vulnerability class on the most of the Bekalta region which occupying an area of 68%. The low and high groundwater vulnerability classes occupy respectively an area of 30% and 2% of the total surface of the study area.

关键词： Phreatic Aquifer Vulnerability Pollution GIS Geodatabase DRASTIC Model

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A Spectroscopic Approach to Assess Heavy Metals Contents of the Mine Waste of Jalta and Bougrine in the North of tunisia

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Journal of Geographic Information System 2012年第3期4卷 242-253页

作者： Sonia Gannouni Noamen Rebai Saadi Abdeljaoued Département de Géologie Université Tunis El Manar Faculté des Sciences de Tunis Dynamique des Bassins Sédimentaires Paléoenvironnements et Structures Géologiques laboratoire des ressources Minérales et environnement Faculté des Sciences de Tunis El Manar

Near InfraRed Spectroscopy (NIRS) has become an extremely important analytical technique in recent years and been applied in various geoscience areas such as mineral exploration and environmental studies. It is used for studying the physico-chemical properties of earth materials by enabling the interpretation of mineral composition and the study of its variability based on the diagnostic of spectral features. In this research, the application of laboratory reflectance spectroscopy in assessing heavy metals pollution is investigated. The potential use of reflectance spectroscopy in detecting Fe-related and clay minerals as well as the quantitative characterization of pollutants is studied for the mine waste of Jalta and Bougrine in the North of tunisia. Mining activities of lead/Zn, have led to extensive pollution. The analysis of geochemical results outlined the level and spatial pattern of pollutants concentration. Results of the study showed that a relationship exists between reflectance spectra and geochemical measures of pollutants. The Spectral interpretation of Fe-related minerals and clay minerals showed that they are related to the pollutants and can be used as indirect spectral indicators of the pollution. The Fe-minerals include: jarosite, goethite, hematite/goethite, and hematite;clay minerals and feature-less (aspectral) materials. A direct quantitative relationship between pollutants and spectral parameters shows that Pb-Zn-Mn are the best correlated with a ratio of 610/500 nm range while Ni-Cr have a best correlation with a slope around 980 nm. Outputs from Partial Least Square Regression (PLSR) confirmed these relationships and also indicated that spectral parameters and reflectance values within 400 - 2500 nm range can better predict the contamination for Mn, Pb and Zn than for Ni and Cr but not for Fe, Cu, Cd, EC and pH.

关键词： Acid Mine Drainage Metals Leaching Geochemical Properties Spectral Properties Spectral Parameters PLSR (Partial Least Square Regression)

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Origanum majorana Extracts as Mild Steel Corrosion Green Inhibitors in Aqueous Chloride Medium

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Journal of Environmental Protection 2016年第4期7卷 532-544页

作者： Hassen Challouf Nébil Souissi Mhamed Ben Messaouda Rym Abidi Adel Madani tunis el manar univ.rsity Institut Préparatoire aux Etudes d’Ingénieurs El Manar Campus Universitaire El Manar Tunis Tunisia Carthage univ.rsity Faculté des Sciences de Bizerte Laboratoire de Recherche “Application de la Chimie aux Ressources et Substances Naturelles et à l’Environnement” Jarzouna Tunisia Carthage univ.rsity Institut Préparatoire aux Etudes Scientifiques & Techniques Laboratoire de Recherche “Matériaux Molécules et Applications” La Marsa Tunisia Carthage univ.rsity Faculté des Sciences de Bizerte Laboratoire de Physique des Matériaux Jarzouna Tunisia

We optimized Origanum majorana (OM) extraction for mild steel corrosion inhibition in neutral 0.5 M chloride medium. The inhibition mechanism evolved in presence of the optimal extract was discussed when calculating the activation energy (Ea), the activation enthalpy (ΔaH) as well as the activation entropy (ΔaS). The OM extract molecules were investigated using the density functional theory (DFT) at B3LYP/6-31G(d,p) basis set level. 1-methyl-4-propan-2-ylcyclohexa-1,3-diene alpha-terpinene was predicted exhibiting the most inhibition capabilities.

关键词： Origanum majorana Corrosion Inhibition Mild Steel NaCl

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