Leaching interaction studies

Leaching of Fully Radioactive High-Level Waste Glass and Waste-Geologic Environment Interaction Studies... 

Waste/soil interaction studies— the leaching of molybdenum from pulverized coal ash... 

WASTE/SOIL INTERACTION STUDIES—THE LEACHING OF MOLYBDENUM FROM PULVERIZED COAL ASH... 

Study [23] Jacobsen s complex was entrapped in the final step of the zeohte synthesis (method C). This process was possible because MCM-22 zeohte is prepared by condensation of a layered precursor, which is exchangeable by the catalytic complex. Leaching of Mn was not observed in these systems, which is not unexpected bearing in mind that the complex is also bovmd to the zeolite structure through an electrostatic interaction. 

D and 5 0 data on fluid inclusions and minerals, 8 C of carbonates, salinity of inclusion fluids together with the kind of host rocks indicate that the interaction of meteoric water and evolved seawater with volcanic and sedimentary rocks are important causes for the formation of ore fluids responsible for the base-metal vein-type deposits. High salinity-hydrothermal solution tends to leach hard cations (base metals, Fe, Mn) from the country rocks. Boiling may be also the cause of high salinity of base-metal ore fluids. However, this alone cannot cause very high salinity. Probably the other processes such as ion filtration by clay minerals and dissolution of halite have to be considered, but no detailed studies on these processes have been carried out. 

The studies on the hydrothermal systems at midoceanic ridges during the last three decades clearly revealed that the seawater-basalt interaction at elevated temperatmes (ca. 100-400°C) affects the present-day seawater chemistry (Wolery and Sleep, 1976 Edmond et al., 1979 Humphris and Thompson, 1978). For example, a large quantity of Mg in seawater is taken from seawater interacting with midoceanic ridge basalt, whereas Ca, K, Rb, Li, Ba and Si are leached from basalt and are removed to seawater (Edmond et al., 1979 Von Dammet al., 1985a,b). 

The possibility of container-closure interactions should be considered, taking into account any admixture and dilution of products. Sorption of active ingredients and excipients should be considered as should leaching of container-closure components over the shelf life. Studies should extend to simulation of use. Pack components, administration devices (e.g., giving sets), and label adhesives should be considered. 

Experimental evidence of the —S03" H0Si— interaction have been obtained from IR, Rh K-edge EXAFS, and CP MAS 3 IP NMR studies. These supported catalysts have been tested for the hydrogenation and hydroformylation of alkenes. No Rh leaching was observed.128-130 An extension to the immobilization of chiral metal complexes for asymmetric hydrogenation is reported below. 

Ling, J.R. and R.M. Leach, Jr. 1979. Studies on nickel metabolism interaction with other mineral elements. Poult. Sci. 58 591-596. 

The scope of this work was not intended to include study and analysis of leaching mechanisms beyond this point, but the data do show that the mechanism is dependent on time, sampling frequency, and type of element. Also, over the long testing period, two different mechanisms account for the release of material. More work is needed to increase our understanding of these high-level waste glass-solution interactions. 

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