تأثير نوع معدن الطين و القوة الأيونية في العلاقة بين نسبة امتزاز الصوديوم (SAR)‎ و النسبة المئوية للصوديوم المتبادل (ESP)‎

Abstract EN

It is tested the relationship between sodium adsorption ratio (SAR) and exchangeable sodium percentage (ESP ) with the difference of clayed mineral( kaolinite and montmorillonite) and ionic strength,(I), (20,40,80,240) mmole.L‾¹.

The results conducted that this relationship differed with the difference of clayed mineral and ionic strength (I).

As well, these results contradicted to what United State Saline Laboratory (USSL) reached in 1954.

It seems that clayed mineral (1:1), Kaolinite, has selectivity to sodium ions in comparison with calcium ions on increasing the ionic strength ( 80, 240 ) m.mole.

L‾¹ while its selectivity to calcium ions increases with the decreasing of ionic strength ( 20,40 ) mmole.L‾¹.

Whereas expanded clayed mineral, (2:1), Montmorillonite, which has internal and external faces has selectivity to sodium ions on minimum ionic strength (20, 40) mmole.L‾¹, and this selectivity decreased to sodium ions with the increasing of ionic strength ( 80, 240 ) mmole.L‾¹ where combination sites in common have selectivity to calcium ions against sodium ions according to diffuse double layer (DDL).