Results 271 to 280 of about 46,223 (311)

Leaching rates of rock-forming components through acidic alteration

Journal of Volcanology and Geothermal Research, 1995
Abstract A series of experiments on the interactions of a glassy basaltic andesite with acidic solution in a flowing system were carried out. Leaching indices of seven components (Na, K, Ca, Mg, Fe, Al and Si) were defined to compare the relative leaching behaviour of these components at all reaction stages.
Kenji Nogami, Minoru Yoshida
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Leach rates of uranium and thorium from murataite ceramics

Radiochimica Acta, 2009
Summary. Samples of murataite-based ceramics with chemical composition (wt.%): 5 Al2O3 ,1 0 CaO, 55 TiO 2 ,1 0 MnO, 5F e 2O3 ,5Z rO 2 ,1 0 AnO 2 (An = Th, U) were produced by melting in both glassy carbon crucibles in a resistive furnace and a cold crucible followed by crystallization during slow cooling.
Sergey V. Stefanovsky, G. A. Varlakova, I. V. Startseva, S. V. Yuduntsev, M.V. Nikonov, M. I. Lapina   +5 more
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Anti‐fouling compositions: Accuracy of leaching rate determinations

Journal of the Society of Chemical Industry, 1949
Abstract1. An outline of the leaching rate method of studying antifouling compositions is given, together with a consideration of the sources of error in such work.2. Details are given of the method used in the present investigation, in which a large number of compositions have been tested.3.
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Effect on Leaching on Pine Litter Decomposition Rate

Ecology, 1969
Leached pine needles have a much higher decomposition rate than unleached ones. Under laboratory conditions, the measurement of carbon dioxide production yields a close estimate of decomposition rate as measured by weight loss.
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Prediction of metal leaching rates from solidified/stabilized wastes using the shrinking unreacted core leaching procedure

Journal of Hazardous Materials, 1997
Abstract The use of cement based stabilization techniques is a common and cost-effective method for stabilization of heavy metals-contaminated sludges and soils. Little is actually known, though, about the mechanisms involved with the release, or leaching, of contaminats from the stabilized waste.
Peter G. Baker, Paul L. Bishop
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Research of Al and Fe Leaching Rate in the Process of Slag Leaching by Hydrochloric Acid

Applied Mechanics and Materials, 2014
Smelting slag from mineral process and blast furnace process to vanadium titanium magnetite is a kind of precious secondary resource in which TiO2 content is higher than 20%. Taking titanium-bearing blast furnace slag in Panzhihua region as research object, this paper analyzes four factors that affect the leaching rate of Al and Fe.
Guang Qiang Mang, Ming Cheng
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Crop Management and Corn Nitrogen Rate Effects on Nitrate Leaching

Journal of Environmental Quality, 2000
AbstractExcess N use in crop production is often identified as a major contributor to NO3 enrichment of ground water. Little information is available to show the specific relationships between crop management systems and N fertilizer use on the amounts of NO3 lost by leaching.
T. W. Andraski, L. G. Bundy, K. R. Brye
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HCl Leaching Rate and Microstructure of Phase‐Separated Borosilicate Glasses

Journal of the American Ceramic Society, 1978
The leaching rate in HCl solution and the glass transition temperature ( T g ) of a borosilicate glass (SiO 2 70, B 2 O 3
TAKESHI TAKAMORI, MINORU TOMOZAWA
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Moment Analysis to Estimate Degradation Rate Constants from Leaching Experiments

Soil Science Society of America Journal, 1996
Abstract First‐order degradation rate constants (γ) are often estimated from the results of solute leaching experiments by using curve‐fitting procedures. However, uniqueness problems can make curve‐fitting a challenging task if multiple parameters are estimated simultaneously.
B. S. Das, G. J. Kluitenberg
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Leaching rates of heavy metal ions in forest soil

Water, Air, and Soil Pollution, 1978
The leachability of Mn, Zn, Cd, Ni, V, Cu, Cr, and Pb was studied in two purely organic spruce forest soils: one control soil and one similar soil heavily polluted by Cu and Zn from a brass foundry in southern Sweden. Artificial rainwater, acidified to pH 4.2, 3.2, and 2.8 was used in the experiment.
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