خيارات البحث
النتائج 1 - 10 من 21
[University courses in environment and pollution [France]]
1982
Renoux, A. (Universite de Paris-12, Creteil (France))
Contribution of remote detection to the study of the influence of a point source on ground pollution levels [air pollution]
1982
Maffiolo, G. (Electricite de France, Chatou (France). Direction des Etudes et Recherches, Departement Environnement Aquatique et Atmospherique, Division Etudes et Essais Physico-Chimiques) | Leriquier, Y. | Dutrannoy, C. | Dubois, J
Measurement of odours and dust in the manufacture of kraft paper pulp [pollution]
1982
Aitken, Y. | Monzie, D.
Contribution to the study of the action mechanisms of atmospheric fluoro compounds on the fructification of strawberry plants (Fragaria L.) [air pollution]
1982
Bonte, J. (Institut National de la Recherche Agronomique, Serres Castet (France). Laboratoire d'Etude de la Pollution Atmospherique) | Bonte, C. | Garrec, J.P. | de Cormis, L
Effects of inhalation of gaseous HF at a rate of 400 microg/m3 on bone tissue and fluorosis during continuous and sequential exposure of guinea-pigs [air pollution]
1982
Bourbon, P. (Universite de Toulouse-3 (France). UER de Sciences Pharmaceutiques, Laboratoire de Toxicologie) | Rioufol, C. | Levy, P
Toxicity of certain mosquito larvicides to the larvivorous fishes Aplocheilus lineatus (Cuv. + Val.) and Macropodus cupanus (Cuv. + Val.)
1982
Jacob, S.S. (Department of Aquatic Biology and Fisheries, Kerala University, Trivandrum 695007 (India)) | Nair, N.B. | Balasubramanian, N.K.
Effect of added water and acidity of simulated rain on growth of field-grown radish
1982
Troiano, J. (Boyce Thompson Institute, Cornell University, Ithaca, NY 14853 (USA)) | Heller, L. | Jacobson, J.S.
Total airborne mercury and its possible origin
1982
Brosset, C. (Swedish Water and Air Pollution Research Inst., Goeteborg (Sweden))
Total airborne Hg as well as black particles (soot) were monitored in a number of clean air areas in Sweden. For some of the sampling sites, back trajectories for air movements at 850 mb were provided by the Norwegian Meteorological Institute. It is shown that the total Hg in air may be divided into two fractions. The most important one may be considered to be a background and is probably the result of re-emission of Hg by the ground and by natural water. The other fraction is highly dependent on wind direction in the same way as black particles. This fraction seems to be of anthropogenic origin.
اظهر المزيد [+] اقل [-]Reactions of chrome tannery sludge with organic and mineral soils
1982
Wickliff, C. (US Environmental Protection Agency, Corvallis, Oregon (USA). Corvallis Environmental Research Lab.) | Volk, V.V. | Tingey, D.T. | Griffis, W.L. | Trunk, M.Y. | Witherow, J.L.
Chrome tannery sludge applied to agricultural land may have benefits in terms of added N for crop growth. An experiment was designed to compare tannery waste with commercial N fertilizer and investigate the potential of the waste as an alternative or supplement to commercial fertilizer. Soils with 38% and 7% orggganic C and N content of 1.3% and 0.2% respectively, were amended with lime, commercial N fertilizer, or tannery sludge containing 1.6% Cr. A portion of the tannery waste was supplemented with additional Cr('3+) salt before adding to the soils. The amended soils were analyzed for total Cr, ammonium acetate extractable Cr, selected nutrient and trace element concentrations. The tannery sludge increased soil pH, total Cr and N, S, Ca, P, Mg, and Na concentrations. DTPA extractable Cr increased only when Cr('3+) salt was added, but soil pH decreased markedly. Electroconductivity of the soils increased with the waste application rate and, at the highest rate of Cr('3+) salt addition, far exceeded values recommended for successful crop production. The acidic, high salt conditions complicated interpretation of the Cr('3+) salt addition results. Tannery sludge may be applied to agricultural land as a fertilizer amendment without adversely affecting soil chemical properties. The amount and frequency of application should be determined by (1) total and available N, (2) total salt content, (3) total and available Cr, and (4) soil organic matter.
اظهر المزيد [+] اقل [-]Effect of heavy metals on microorganisms in soils near secondary lead smelter
1982
Bisessar, S. (Ontario Ministry of the Environment, Toronto (Canada). Phytotoxicology Section)
Soil samples were collected to a depth of 0 to 10 cm from several sites near a secondary Pb smelter during the summer of 1976 in order to determine heavy metal concentrations of soil and enumerate soil microorganisms and earthworms. Chemical analyses indicated that abnormally high concentrations of Pb, As, Cd, and Cu decreased with increasing distance from the source and population counts of bacteria, actinomyces, fungi, nematodes and earthworms increased with increasing distance from the smelter. The negative correlation coefficients between bacteria, actinomyces, fungi, and nematodes and the level of Pb, As, Cd, and Cu in the soil were statistically significant. The microflora of the contaminated soil was altered and the marked quantitative reduction or elimination of organisms were attributable to heavy metal pollution emission from the secondary Pb smelter.
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