Young bean plants (Phaseolus vulgaris) containing root-absorbed (45)Ca and (86)Rb were leached to determine the pathway and mechanism of cation loss by leaching. Calcium is leached from the exchangeable calcium fraction within the plant by a process of ion exchange and diffusion involving exchange sites both within the leaf and on the leaf surface. Leaching of cations is primarily a passive pro...

A framework for the evaluation of inorganic constituent leaching from wastes and secondary materials is presented. The framework is based on the measurement of intrinsic leaching properties of the material in conjunction with mathematical modeling to estimate release under field management scenarios. Site specific and default scenarios are considered, which may be selected based on the evaluati...

This letter report presents the result of a survey of open-literature information on the leaching characteristics of coatings used in nuclear power plants. The survey, in general, indicated a complete lack of information on leachability, leaching rate, and potential leaching constituents of nuclear-powerplant coatings. Furthermore, there has been no concerted test program to evaluate the role o...

Invertase was immobilised on microporous montmorillonite K-10 via adsorption and covalent binding. The immobilised enzymes were tested for sucrose hydrolysis activity in a batch reactor. Km for immobilised systems was greater than free enzyme. The immobilised forms could be reused for 15 continuous cycles without any loss in activity. After 25 cycles, 85% initial activity was retained. A study ...

The influence of adsorption-desorption phenomena and distribution of pore sizes on lhe leaching beh.viour of two herbicides, thiazafluron (highly polar, nonionic) and clopyralid (anionic) in three soils has been studied. Adsorption d.ta, obtained by b.tch equilibriwn, were fitted to Freundlich equation and Kf values calculated. Pore size distribution of the soils was studied by mercury porosime...

an approach to recycle precious metals of cathode materials from spent lithium cobalt oxide batteries by using organic citric acid and hydrogen peroxide has been studied in this paper. the effects of molar ratio, solid-liquid ratio, reaction time and temperature on leaching efficiency of cobalt were investigated respectively. meanwhile the leaching kinetics equation of cobalt was established, a...

In regions like south of “ khouzestan” that water table are high, under the effect of water rise moving through capillary fringe and its vaporize,  the salts move to soil surface and cause salin or salin and sodic soils. Leaching assign as one of those adjustment soils methods. In order to investigate the leaching process and draw the curves of desalinization and dealkalization in region of Dar...