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Cation-exchange capacity (CEC) is a measure of how many cations can be retained on soil particle surfaces. [1] Negative charges on the surfaces of soil particles bind positively-charged atoms or molecules (cations), but allow these to exchange with other positively charged particles in the surrounding soil water. [2]
Aluminum is one of the few elements capable of making soil more acidic. [22] This is achieved by aluminum taking hydroxide ions out of water, leaving hydrogen ions behind. [23] As a result, the soil is more acidic, which makes it unlivable for many plants. Another consequence of aluminum in soils is aluminum toxicity, which inhibits root growth ...
A metal ion in aqueous solution or aqua ion is a cation, dissolved in water, of chemical formula [M(H 2 O) n] z+.The solvation number, n, determined by a variety of experimental methods is 4 for Li + and Be 2+ and 6 for most elements in periods 3 and 4 of the periodic table.
The molar ionic strength, I, of a solution is a function of the concentration of all ions present in that solution. [3]= = where one half is because we are including both cations and anions, c i is the molar concentration of ion i (M, mol/L), z i is the charge number of that ion, and the sum is taken over all ions in the solution.
Aluminium-based alums are named by the monovalent cation. Unlike the other alkali metals, lithium does not form alums; a fact attributed to the small size of its ion. The most important alums are Potassium alum, KAl(SO 4) 2 ·12 H 2 O, also called "potash alum" or simply "alum" Sodium alum, NaAl(SO 4) 2 ·12 H 2 O, also called "soda alum" or "SAS"
Soil chemistry is the study of the chemical characteristics of soil.Soil chemistry is affected by mineral composition, organic matter and environmental factors. In the early 1870s a consulting chemist to the Royal Agricultural Society in England, named J. Thomas Way, performed many experiments on how soils exchange ions, and is considered the father of soil chemistry. [1]
It has two planes of silicon, one of aluminium and one of magnesium; hence it is a 2:2 clay. [43] Chlorite does not swell and it has low CEC. [41] [44] Kaolinite is a very common, highly weathered clay, and more common than montmorillonite in acid soils. [45] It has one silica and one alumina plane per crystal; hence it is a 1:1 type clay.
Soil pH is a measure of the acidity or basicity (alkalinity) of a soil. Soil pH is a key characteristic that can be used to make informative analysis both qualitative and quantitatively regarding soil characteristics. [1] pH is defined as the negative logarithm (base 10) of the activity of hydronium ions (H + or, more precisely, H 3 O + aq) in ...