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Decomposition of pine-litter organic matter and chemical properties of upper soil layers: transect studies
1997
Breymeyer, A. | Degorski, M. | Reed, D. (Institute of Geography and Spatial Organization PAS, Twarda 51/55, 00-818 Warsaw (Poland))
Effects of elevated CO2, nitrogen supply and tropospheric ozone on spring wheat-II. Nutrients (N, P, K, S, Ca, Mg, Fe, Mn, Zn)
1997
Fangmeier, A. | Gruters, U. | Hogy, P. | Vermehren, B. | Jager, H.J. (Institut fur Pflanzenokologie, Heinrich-Buff-Ring 38, D-35392 Giessen (Germany))
Oxidation of HSO3-in aqueous suspensions of alpha-Fe2O3, alpha-FeOOH, beta-FeOOH and gamma-FeOOH in the dark and under illumination
1997
Ansari, A. | Peral, J. | Domenech, X. | Rodriguez-Clemente, R. (Departament de Quimica, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona (Spain))
Removal of TNT and RDX from water and soil using iron metal
1997
Hundal, L.S. | Singh, J. | Bier, E.L. | Shea, P.J. | Comfort, S.D. | Powers, W.L. (Institute of Agriculture and Natural Resources, University of Nebraska, Lincoln, Nebraska 68583-0915 (USA))
Behaviour of metals following intensive pig slurry applications to a natural field treatment process in Brittany (France)
1997
L'Herroux, L. | Roux, S. le | Appriou, P. | Martinez, J. (UBO, UMR CNRS 5521, Departement de Chimie, UFR Sciences, 6 Avenue Le Gorgeu, F-29285 Brest cedex (France))
Mobility of Zn, Cd and Pb in soils as affected by poultry litter extract-II. Redistribution among soil fractions
1997
Li ZhenBin | Shuman, L.M. (Department of Crop and Soil Science, Georgia Experiment Station, University of Georgia, Griffin, GA 30223-1797 (USA))
Organism-induced accumulation of iron, zinc and arsenic in wetland soils
1997
Doyle, M.O. | Otte, M.L. (Department of Botany, University College Dublin, Belfield, Dublin 4 (Ireland))
a new high-pressure squeezing technique for pore fluid extraction from terrestrial soils
1997
Böttcher, Gerd | Brumsack, Hans-J. | Heinrichs, H. (Hartmut) | Pohlmann, Markus
A new plastic-lined high-pressure squeezing device has been developed for the extraction of soil pore solutions. At a maximum pressure of 1100 kg cm⁻² the water recovery ranged between 30 and 55% of the total water content. Pressure dependent squeezing experiments showed a general increase in Si, Mn, Mg, Ca, K, Na, Al, Fe, Cd, and Zn concentrations with progressive pore water extraction and increasing pressure, indicating that micro pore solutes have the highest concentrations of solutes. Soil samples with moisture contents of more than about 15% generally provided enough water for major and trace element analyses. The data do not reveal any contamination of the pore fluids from the squeezing device. An advantage of this method is that the solution could be closely related to a specific soil horizon on a cm scale and also to the time of sampling. A further application of this squeezing method is the possibility of pressure dependent sequential squeezing to obtain fluids from different pore spaces.
Show more [+] Less [-]Partitioning of heavy metals in podzol soils contaminated by mine drainage waters, dalarna, sweden
1997
HERBERT, R. B., JR.
The discharge of acidic mine drainage waters onto a hillslope in Dalarna, central Sweden, has lead to the contamination of the podzol soils with Cu, Fe, Ni, Pb, Zn and sulfate. Samples from contaminated and reference soils have been collected for chemical and mineralogical analyses. Jarosite is identified by x-ray diffraction analysis as a precipitate in the upper horizons (A, E, B) of the contaminated soils, where the soil acidity (pHKCₗ ∼ 2.6) promotes jarosite stability. The sequential chemical extraction of soil samples indicates that, in the reference A horizon, Cu, Pb, Ni and Zn are bound primarily to cation exchange sites and organic matter. In the A horizon of the contaminated soils closest to the rock dump, metal partitioning is dominated by the Fe oxide fractions, despite the high organic matter content; Pb is almost completely bound to crystalline Fe oxides, possibly adsorbed to Fe oxides or occuring in a jarosite solid solution. In the reference B and C horizons, Cu, Ni and Zn are primarily adsorbed/coprecipitated in the Fe oxide fractions, while Pb remains with a large fraction bound to organic matter. In the Fe-rich B horizon of the contaminated soils, the partitioning of the metals in cation exchange sites and to organic matter has greatly increased relative to the reference soils, resulting from the mobilization of organo-metal complexes down the profile.
Show more [+] Less [-]Pigment changes in norway spruce induced by dust pollution
1997
MANDRE, MALLE | TUULMETS, LIIVI
The influence of alkaline dust pollution (pH of water solution of dust 12.3–12.7) from a cement plant (Kunda town, Estonia) on chlorophylls and carotenoids of the needles of 60–80 year old Norway spruce was studied on sample plots established at different distances from the emission source. The highest sensitivity to dust impact was measured in the content of Chl a, Chl b, carotenoids and elements regulating or participating in the biosynthesis of pigments (Mg, Fe, N, Mn).
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