Overall, model variant v3, which included an optimisation of nitrification rates, partial pressure of C[O.sub.2], and cation exchange
using calibration experiments, was well suited for subsequent predictions of the results of different fertilisation experiments and proton buffering in both soils with EF values of 0.8 (SO) and 0.9 (DA) (Figs 4 and 5) and only slight deviations between measured and modelled releases of ions in the HCl experiments (Table 5).
On the cation exchange
sites, the "ideal" magnesium: potassium ratio is --.
([double dagger]) ECEC = effective cation exchange
capacity determined by addition of exchangeable cations.
This value, determined by the amount of clay, the type of clay, and the amount of humus, is measured by cation exchange
capacity (CEC), which is expressed in milligram equivalents per 100 grams of soil (mEq/100 g).An equivalent weight is the weight of the number of atoms of an element that is the same as the number of atoms in one gram of hydrogen.
TABLE 1 Cation exchange
capacities (CEC) and organic matter percentages (%OM) of soil samples (Depths 0-8").
I presume that it uses an anion exchange resin (in the [OH.sup.-] form) as well as a cation exchange
resin (in the [H.sup.+] form).
diameter acrylic plastic, was filled with 4 ft of cation exchange
(softening) resin as part of an effort to reduce the concentration of ammonium ion entering the copper pipe corrosion test loop (2).
The cation exchange
columns was homemade via a grafting reaction adopted from patent  and had a capacity of 48 ueq g-1 using PEEK columns (100 mm x 4 mm I.D.).
These cementitious constituents modify and stabilize soft soil through cation exchange
, flocculation and agglomeration, and reactions .
And added organic matter in the water can improve soil aeration, water-holding capacity and cation exchange
Because soil organic matter (SOM) has a large negative charge density compared with mineral material, it makes a disproportionately large contribution to soil cation exchange
capacity (CEC) (Curtin and Rostad 1997).
may result in partial breaking of the cages with the smaller window diameter, such as [beta]-cage with six-member ring (about 2.6 [direct sum]).