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Environmental fate & pathways

Adsorption / desorption

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A number of chemical factors can alter the speciation of aluminium, thereby affecting the extent of adsorption and desorption of aluminium on suspended particles, as a result aluminium speciation is complex and changes significantly with changes in pH. 

Due to its dynamic chemistry, the amount of aluminium associated with suspended particles is dependent on the chemical conditions. Factors that are known to affect aluminium speciation, such as pH and DOC, are also known to affect adsorption and desorption from particle surfaces.

In a study on sorption behavior of aluminium on black and albic soils, it was shown that the amount of aluminium adsorbed by the soils was higher in the range of of pH 4 to 6 and the adsorption capacity decreased when the contents of organic matter decreased.

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