


Volume 20 No 12 (2022)
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The effect of the leaching process on the kinetics of magnesium dissolution for soils of different use
Roaa Raad Ghanim and Abd Alkader A. Alhadede
Abstract
The study was conducted to describe the behavioral processes that liberate magnesium as a
result of its dissolution from salts and minerals carrying it in unconsulted natural soil
columns. Not exploited agriculturally ("abandoned") and leached with different types of
water (distilled water, river water, well water) and for six porous volumes by the method of
continuous and intermittent leaching, The results showed an increase in the amount of
magnesium liberated from the process of dissolving salts and minerals and supplying the
equilibrium solution with the duration of water flow through the soil columns by increasing
the ionic strength, as well water outperformed the rest of the used water types, and the
intermittent leaching treatment showed more liberation than the continuous leaching
factor, as the amount of magnesium reached The liberated from dissolution by continuous
leaching was (0.042-1.872) cmol kg-1
of soil in the site of the abandoned soil, while it reached
(0.032-3.282) cmol kg-1
of soil by intermittent leaching in the site of soil treated with well
water, The mathematical description of the liberation process showed the presence of two
paths controlling the dissolution process, the first being a rapid reaction representing the
easy-to-dissolve salts, and the second in which the dissolution paths were consecutive and
took a straight shape representing the liberation from the melting of the metal. And the
force function equation, The Elovich equation showed the lowest value of the melt speed
coefficient, which reached (47.0 and 17.0) cmol kg-1 min-1
in the abandoned soil treated with
distilled water by the continuous and intermittent leaching method, respectively, while the
highest value of the melt speed coefficient reached (9877.0-4880.0) cm kg-1 min-1
at the site
of vegetable soil treated with well water by continuous and intermittent leaching method,
respectively
Keywords
Magnesium, Leaching, Continuous, Discontinuous
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