خيارات البحث
النتائج 1 - 10 من 12
Heavy metal concentrations in consecutive saturation extracts of dredged sediment derived surface soils
1998
Tack, F.M.G. | Singh, S.P. | Verloo, M.G. (Laboratory for Analytical Chemistry and Applied Ecochemistry, University of Ghent, Coupure Links 653, B-9000 Gent (Belgium))
Competitive sorption of heavy metal by soils. Isotherms and fractional factorial experiments
1998
Echeverria, J.C. | Morera, M.T. | Mazkiaran, C. | Garrido, J.J. (Universidad Publica de Navarra, Departamento de Quimica Aplicada, Campus Arrosadia, 31006 Pamplona (Spain))
Removal of trace metals from contaminated soils using EDTA incorporating resin trapping techniques
1998
Tejowulan, R.S. | Hendershot, W.H. (Department of Soil Science, University of Mantaram, Jin. Pendidikan No. 56, Mantaram, NTB (Indonesia))
Release of metals from homogeneous soil columns by wastewater from an agricultural industry
1998
Madrid, L. | Diaz-Barrientos, E. (Instituto de Recursos Naturales y Agrobiologia de Sevilla (CSIC), Apartado 1052, E-41080 Sevilla (Spain))
Trends in needle and soil chemistry of Norway spruce and Scots pine stands in South Sweden 1985-1994
1998
Thelin, G. | Rosengren-Brinck, U. | Nihlgard, B. | Barkman, A. (Forest Ecology, Department of Plant Ecology, Ecology Building, Lund University, S-223 62 Lund (Sweden))
Trace elements in striped dolphins (Stenella coeruleoalba) from the western Mediterranean
1998
Monaci, F. | Borrel, A. | Leonzio, C. | Marsili, L. | Calzada, N. (Dipartimento di Biologia Ambientale, Universita degli Studi di Siena, via delle Cerchia 3, 53100 Siena (Italy))
Comparison of selected element concentrations in tall and short forms of Spartina alterniflora
1998
Ornes, W.H. | Sajwan, K.S. | Loganathan, B.G. | Chetty, C.S. (Department of Biology and Geology, University of South Carolina, Aiken, SC 29801 (USA))
Airborne Pollution in Five Drainage Basins in Eastern Finnmark, Norway: an Evaluation of Overbank Sediments as Sampling Medium for Environmental Studies and Geochemical Mapping
1998
Langedal, Marianne | Ottesen, Rolf Tore
To study whether airborne pollution can be detected in overbank sediments, samples collected from five overbank sediment profiles in eastern Finnmark, Norway, at 1 cm depth intervals, were subjected to chemical analysis and ²¹⁰Pb dating. The studied drainage basins constitute parts of an area polluted by emissions from two Ni-Cu smelters in Russia. In the most polluted catchment area, the surface sample showed a 5-fold higher Ni concentration and a 3-fold higher Cu concentration than the pre-industrial sediments at depth. The increases started at the same time as the smelters. Slight Ni increases were also detected in the neighbouring drainage basin, while no significant concentration change was seen in drainage basins previously shown to be only weakly influenced by the smelter emissions. In the most polluted drainage basin, the increase in Ni accumulation rate did not equal the airborne deposition rate. Selective surface erosion of fine grained particles with adhering airborne Ni has probably caused excess Ni accumulation in both overbank and lake sediments. On the contrary, opening of minerogenic point sources may dilute the pollutant concentrations in the drainage sediments. Thus, dating of the sediment profiles is necessary to determine the airborne pollutant accumulation rates. However, dating is not necessary to map the resultant concentration increase, that may show the increased exposure of humans and biota in contact with the sediments.
اظهر المزيد [+] اقل [-]Geographic Classification of Heavy Metal Concentrations in Mosses and Stream Sediments in the Federal Republic of Germany
1998
Berlekamp, Jürgen | Herpin, Uwe | Matthies, Michael | Lieth, Helmut | Markert, Bernd | Weckert, Vera | Wolterbeek, H. Th. | Verburg, Tona | Zinner, Hans-Jürgen | Siewers, Ulrich
The results of the first German moss monitoring programme to estimate heavy metal pollution in the Federal Republic of Germany were combined with other large-scale investigations carried out in Germany and then classified geographically in a new form. Using Monte Carlo assisted factor analysis, six factors indicating sources of pollution were identified from the sets of element data from the moss monitoring project (As, Cd, Cr, Cu, Fe, Ni, Pb, Ti, V, Zn) and the data sets for SO₂ and particulate. The geographic distribution patterns of the factor values showed the regions in which the various sources are to be found. By combining the data the primarily anthropogenic chromium concentrations of the mosses were compared with the mainly geogenic chromium concentrations of the stream sediments in the form of examples. After normalization, the transformed chromium concentrations were transferred to a map of the entire area using inverse distance weighting. Anthropogenic and geogenic influences are being discussed on the basis of the results.
اظهر المزيد [+] اقل [-]Effects of nesting yellow-legged gulls (Larus cachinnans pallas) on the heavy metal content of soils in the Cies Islands (Galicia, North-West Spain)
1998
Perez, X.L.O. (Departamento de Edafoloxia e Quimica Agricola, Facliltade de Bioloxia, 15 706 Santiago de Compostela (Spain))