The Experts below are selected from a list of 84 Experts worldwide ranked by ideXlab platform
Jean-françois Ponge - One of the best experts on this subject based on the ideXlab platform.
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An optical analysis of the organic soil over an old Petroleum Tar deposit
Geoderma, 2017Co-Authors: Sophie Gillet, Jean-françois PongeAbstract:We analysed by an optical method (the small volume method) the composition and the vertical distribution of an organic soil which accumulated over an old Petroleum Tar deposit. The study site was an oil refinery now colonised by woody vegetation since the time of abandonment (1964), located at Merkwiller-Pechelbronn (Alsace, France). Comparisons were done with a nearby unpolluted control plot under similar vegetation. The humus form over the Tar deposit was described as an Hemimoder. It was characterised by fine fragmentation of litter, darkening of tree leaves with depth and a dense mycelial mat associated with an ectomycorrhizal root system. Faunal activity was dominated by enchytraeids. The Mesomull described at the control plot was characterized by fast recycling of litter and earthworm activity.
Sophie Gillet - One of the best experts on this subject based on the ideXlab platform.
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An optical analysis of the organic soil over an old Petroleum Tar deposit
Geoderma, 2017Co-Authors: Sophie Gillet, Jean-françois PongeAbstract:We analysed by an optical method (the small volume method) the composition and the vertical distribution of an organic soil which accumulated over an old Petroleum Tar deposit. The study site was an oil refinery now colonised by woody vegetation since the time of abandonment (1964), located at Merkwiller-Pechelbronn (Alsace, France). Comparisons were done with a nearby unpolluted control plot under similar vegetation. The humus form over the Tar deposit was described as an Hemimoder. It was characterised by fine fragmentation of litter, darkening of tree leaves with depth and a dense mycelial mat associated with an ectomycorrhizal root system. Faunal activity was dominated by enchytraeids. The Mesomull described at the control plot was characterized by fast recycling of litter and earthworm activity.
Joan O. Grimalt - One of the best experts on this subject based on the ideXlab platform.
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Monitoring of hazardous waste dumps by the study of metals and solvent-soluble organic chemicals
Chemosphere, 1991Co-Authors: Andres Navarro, Antoni Rosell, Joan Villanueva, Joan O. GrimaltAbstract:Abstract The metal and organic composition of twelve soil core sections collected at several hazardous waste dumping sites located in the Besos and Llobregat Basins (Catalonia, N.E. Spain) have been examined. They have been analyzed by neutron activation, atomic absorption spectrophotometry, gas chromatography and gas chromatography coupled to mass spectrometry. These techniques have allowed the quantitative measurement of 37 metals and the identification and quantitation of 135 organic constituents. The analyses have shown that Petroleum Tar residues and lubricating oils constitute the two major types of organic wastes present in these dumps. Organic chemicals from other origins such as phthalates and silicones are also abundant. The metal pollution can be traced from the nickel and chromium content. These two metals are found in highest concentration in sample No. 6 where high concentrations of iron (25%), copper and cobalt are also observed. In some dumps (S1 and S5) the presence of free sulphur and organosulphur compounds evidences the activity of sulphato-reducing bacteria, which involves a partial mineralization of the disposed organic wastes.
Andres Navarro - One of the best experts on this subject based on the ideXlab platform.
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Monitoring of hazardous waste dumps by the study of metals and solvent-soluble organic chemicals
Chemosphere, 1991Co-Authors: Andres Navarro, Antoni Rosell, Joan Villanueva, Joan O. GrimaltAbstract:Abstract The metal and organic composition of twelve soil core sections collected at several hazardous waste dumping sites located in the Besos and Llobregat Basins (Catalonia, N.E. Spain) have been examined. They have been analyzed by neutron activation, atomic absorption spectrophotometry, gas chromatography and gas chromatography coupled to mass spectrometry. These techniques have allowed the quantitative measurement of 37 metals and the identification and quantitation of 135 organic constituents. The analyses have shown that Petroleum Tar residues and lubricating oils constitute the two major types of organic wastes present in these dumps. Organic chemicals from other origins such as phthalates and silicones are also abundant. The metal pollution can be traced from the nickel and chromium content. These two metals are found in highest concentration in sample No. 6 where high concentrations of iron (25%), copper and cobalt are also observed. In some dumps (S1 and S5) the presence of free sulphur and organosulphur compounds evidences the activity of sulphato-reducing bacteria, which involves a partial mineralization of the disposed organic wastes.
Peter Dann - One of the best experts on this subject based on the ideXlab platform.
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Removal of Petroleum Tar from bird feathers utilizing magnetic particles
Environmental Chemistry Letters, 2006Co-Authors: Hien V. Dao, Lauren A. Maher, Lawrence N. Ngeh, Stephen W. Bigger, John D. Orbell, Margaret Healy, Rosalind Jessop, Peter DannAbstract:A previously reported acute temperature dependency for the effective removal of Tarry residue from feather clusters, utilising magnetic particles, has also been demonstrated to occur for the plumage of whole birds, whereby a maximum removal of up to 96% may be achieved. The experimental design allows an approximate equilibrium constant, for the distribution of contaminant between the residue and the magnetic particles, to be estimated at each temperature. This allows the thermodynamics of the process to be examined via application of the van't Hoff equation, suggesting an explanation for the phenomenon.