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[Correlation between soil stripping and in-situ cleanup]
1997
Knudsen, S. | Aagaard, J.
[Air sparging from horizontal drilling and vacuum extraction for elimination of chlorinated solvents]
1997
Henriksen, L.H. | Heron, T. | Dahlstroem, K.
[Detection of degradation products using chemical and biological methods [intrinsic bioremediation]]
1997
Dyreborg, S.
[Modelling of gas transport and gas adsorption by soil venting [well vacuum]]
1997
Poulsen, T.G. | Moeldrup, P.
Anthropogenic impacts on natural nitrogen isotope variations in Pinus sylvestris stands in an industrially polluted area
1997
Jung, K. | Gebauer, G. | Gehre, M. | Hofmann, D. | Weissflog, L. | Schuurmann, G. (Department of Chemical Ecotoxicology, Centre for Environmental Research Leipzig-Halle, P.O. Box 2, D-04301 Leipzig (Germany))
Bioaccumulation and physiological effects of excess lead in a roadside pioneer species Sonchus oleraceus L
1997
Xiong ZhiTing (Department of Environmental Science, Wuhan University, Wuhan, Hubei 430072 (China))
Patterns of soil copper contamination and temporal changes in vegetation in the vicinity of a copper rod rolling factory
1997
Lepp, N.W. | Hartley, J. | Toti, M. | Dickinson, N.M. (School of Biological and Earth Sciences, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF (United Kingdom))
Accumulation of cadmium and zinc from diffuse immission on acid sandy soils, as a function of soil composition
1997
Wilkens, B. J. | Loch, J. P. G.
Sandy soils, in the border area of Belgium and the Netherlands (the Kempen region), are heavily contaminated by atmospheric deposition of cadmium and zinc from nearby smelters. Groundwater contamination by leaching from these low retention soils is subject of study. There are reports of high cadmium and zinc concentrations in groundwater in the area, but in most cases the direct sources are unknown. In an attempt to predict present or future risk of groundwater contamination by soil leaching, metal binding processes (retardation) were studied that are specific for these soil types under the existing acidifying conditions. From four fields nine contaminated profiles were sampled and analyzed for cadmium and zinc. Average concentrations of 131μg g⁻¹ zinc and 1.6μg g⁻¹ cadmium with maximum values of 2989μg g⁻¹ respectively 16.3μg g⁻¹ were found. In addition pH and contents of organic matter, aluminium, iron, and manganese were determined. The relative importance of these soil parameters for metal retardation is derived from the profiles. The data show that organic matter is the most important soil component for binding cadmium and zinc. Adsorption of cadmium and zinc on aluminium, iron and manganese (hydr) oxides appears to be of minor importance at low pH (<5.5).
Show more [+] Less [-]Ecological effects of combined organic or inorganic pollution on soil microbial activities
1997
Gong, Ping | Sun, Tie-Heng | Beudert, Günter | Hahn, H. H. (Hermann H.)
Combined effects of organic or inorganic pollutants on soil microbial activities were investigated in field plots grown with four types of covering plants. It was derived from this study that combined effects were dependent not only on the type and dose of pollutants, addition of soda lime, plant type and season variation, but also on test parameters. When jointly added, higher doses of Cd, Cu, Pb, Zn and As caused significant inhibition. Addition of soda lime could even enhance inhibition. Joint effects of phenanthrene, MET (active ingredient: paclobutrazol) and 1,2,4-trichlorobenzene were not significant, and may be covered by other biotic or abiotic factors. Compared with other two parameters (respiration and microbial biomass), dehydrogenase activity appeared to be more sensitive for evaluating the toxicity of anthropogenic pollutants in soil. Soil samples collected in summer often had higher microbial activities than those in fall. The microbial activity in soil decreased with covering vegetation in the order alfalfa > pine > poplar and maize, albeit some exceptions were observed.
Show more [+] Less [-]Effects of metals on the microbial mineralization of organic acids
1997
Brynhildsen, L. (Linkoeping Univ. (Sweden). Dept. of Water and Environmental Studies) | Rosswall, T.